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RESEARCH REPORT ABOUT ARYACOIN

RESEARCH REPORT ABOUT ARYACOIN
Author: Gamals Ahmed, CoinEx Business Ambassador

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ABSTRACT

Aryacoin is a new cryptocurrency, which allows for decentralized, peer to peer transactions of electronic cash. It is like Bitcoin and Litecoin, but the trading of the coin occurs on sales platforms that have no restriction to use. Further, it was created with the goal of addressing the double spend issues of Bitcoin and does so using a timestamp server to verify transactions. It works by taking the hash of a block of items to be timestamped and widely publishing the hash. The timestamp proves that the data must have existed at the time in order to get the hash. Each timestamp then includes the previous timestamp in its hash, forming a chain.
The Aryacoin team is continuously developing new use cases for the coin, including exchanges where users can exchange the coins without any fees or restrictions, and offline options where the coins can be bought and sold for cash. The coins can also be used on the company’s other platform, mrdigicoin.io. Along with the coin, there is a digital wallet that can be created and controlled by the user entirely, with no control being retained by the Aryacoin team.

1.INTRODUCTION

The concept of Blockchain first came to fame in October 2008, as part of a proposal for Bitcoin, with the aim to create P2P money without banks. Bitcoin introduced a novel solution to the age-old human problem of trust. The underlying blockchain technology allows us to trust the outputs of the system without trusting any actor within it. People and institutions who do not know or trust each other, reside in different countries, are subject to different jurisdictions, and who have no legally binding agreements with each other, can now interact over the Internet without the need for trusted third parties like banks, Internet platforms, or other types of clearing institutions.
When bitcoin was launched it was revolutionary allowing people to transfer money to anytime and anywhere with very low transaction fees . It was decentralized and their is no third party involved in the transaction , only the sender and receiver were involved.
This paper provide a solution to the double-spending problem using a peer-to-peer distributed timestamp server to generate computational proof of the chronological order of transactions.The system is secure as long as honest nodes collectively control more CPU power than any cooperating group of attacker nodes. Bitcoin was made so that it would not be controlled or regulated but now exchanges and governments are regulating bitcoin and other cryptocurrencies at every step. Aryacoin was developed to overcome these restrictions on a free currency.
Aryacoin is a new age cryptocurrency, which withholds the original principle on which the concept of cryptocurrency was established. Combining the best in blockchain technology since the time of its creation, Aryacoin strives to deliver the highest trading and mining standards for its community.

1.1 OVERVIEW ABOUT ARYACOIN

Aryacoin is a new age cryptocurrency, which withholds the original principle on which the concept of cryptocurrency was established. Combining the best in blockchain technology since the time of its creation, Aryacoin strives to deliver the highest trading and mining standards for its community.
Aryacoin is a blockchain based project that allows users to access their wallet on the web and mobile browsers, using their login details.
Aryacoin can be mined; it also can be exchanged by other digital currencies in several world-famous exchanges such as Hitbtc, CoinEx, P2pb2b, WhiteBit, Changelly and is also listed in reputable wallets such as Coinomi and Guarda.
Aryacoin is a coin, which can be used by anyone looking to use cryptocurrency which allows them to keep their privacy even when buying/selling the coin along with while using the coin during transactions. Proof of work and cryptographic hashes allows transactions to verified.
Stable Fee Per AYA is a unique feature of Aryacoin, so by increasing the amount or volume of the transaction, there is no change in the fee within the network, which means that the fee for sending an amount less than 1 AYA is equal to several hundred million AYA. Another unique feature of Aryacoin is the undetectability of transactions in Explorer, such as the DASH and Monero, of course, this operation is unique to Aryacoin.
Using Aryacoin digital currency, like other currencies, international transactions can be done very quickly and there are no limitations in this area as the creators claim.
Aryacoin aims to allow users to access the Aryacoin wallet via the web and mobile browsers using their login details.
Aryacoin is a peer-to-peer electronic cash system that enables users to send and receive payments directly from one party to another, and allow them to transfer funds across borders with no restriction or third party involvement. The blockchain-based system embraces the digital signature, which prevents double spending and low transfer fees, which enables users to transfer huge amounts with very low fees. The proof-of-work consensus mechanism allows each transaction to be verified and confirmed, while anonymity enables users to use the coin anywhere at any time.
According to the website of the operation, each wallet is divided into 2 or more AYA wallet addresses for each transaction, and depending on the volume of the transaction block, the origin, and destination of transactions in the network can not be traced and displayed to the public.
In fact, each wallet in Aryacoin consists of a total of several wallets. The number of these wallets increases per transaction to increase both security and privacy. Aryacoin also uses the dPoW protocol. In the dPoW protocol, a second layer is added to the network to verify transactions, which makes “51% attack” impossible even with more than half of the network hash, and blocks whose Blockchain uses this second layer of security never run the risk of 51% attacks.
AYA has been listed on a number of crypto exchanges, unlike other main cryptocurrencies, it cannot be directly purchased with fiats money. However, You can still easily buy this coin by
first buying Bitcoin from any large exchanges and then transfer to the exchange that offers to trade this coin.

1.1.1 ARYACOIN HISTORY

Aryacoin (AYA) is a new cryptocurrency, which has been created by a group of Iranian developers, is an altcoin which allows for decentralised, peer to peer transactions of electronic cash without any fees whatsoever. Along with the coin, there is a digital wallet that can be created and managed by the user entirely, with no control being retained by the Aryacoin team.
Aryacoin’s founder, Kiumars Parsa, has been a fan of alternative currencies and particularly Bitcoin.
We see people from all around the world using Blockchain technology and the great benefits that came with it and it then that I decided to solve this puzzle for find a way of bringing the last missing piece to the jigsaw. The idea for Aryacoin was born.” Parsa said.
Parsa and his team of Iranian ex-pats not only persevered but expedited the project and just a year later, in the summer of 2019, the first version of Aryacoin was released. In 2020, Aryacoin is the first and only Iranian coin listed on CMC.
Parsa goes on to state that it is now the strength of the community that has invested in the coin that will ultimately drive its success, alongside its robust technology and appealing 0% network fees.
We have thousands of voices behind Aryacoin. People for the people make this coin. It is a massive shout out for democracy. This had made us base the whole team strategy on the benefits for both our users and our traders.
One key example is that the network fee on AYA Blockchain is 0%. Yes, absolutely nothing, which which differentiates us from other networks. What also differentiates us from other coins is that we have AYAPAY which is the first cryptocurrency Gateway in the world which does not save funds on third party storage with all funds being forwarded directly to any wallet address that the Gateway owner requests”.
So for the first time ever, and unlike other gateways, incoming funds will be saved on the users account with submitted withdrawal requests then made on the Gateway host website. In AYAPAY which has also been developed by the Aryacoin team, all funds without extra fees or extra costs will directly forwarded to users wallets. We have named this technology as CloudWithdrawal.
We are continuously challenging ourselves as it is a crowded marketplace. We are striving to have a safer Blockchain against 51% attacks, faster confirmations speeds of transactions, cheaper network fee, growing the market by cooperation with Top tier Exchangers.

1.1.2 ARYACOIN’S MAIN GOAL

Aryacoin’s main goal is to educate people and give them the freedom to use cryptocurrency in any way they want. Aryacoin empowers the users to transfer, pay, trade cryptocurrency from any country around the globe.
Platforms that have been created by Aryacoin Team, as well as those that will go live in future, operate on the same principle and exclude absolutely no one.

1.1.3 PROBLEM ARYACOIN SEEKS TO SOLVE

Aryacoin aims to provide a long-term solution to the problem of double spending, which is still common in the crypto market. The developers of the system have created a peer-to-peer distributed timestamp server that generates computational proof of the transactions as they occur.
Besides, the system remains secure provided honest nodes control more CPU power than any cooperating group of attacker nodes. While Bitcoin was designed not to be regulated or controlled, many exchanges and governments have put regulatory measures on the pioneer cryptocurrency at every step. Aryacoin aims to overcome these restrictions as a free digital currency.

1.1.4 BENEFITS OF USING ARYACOIN

Aryacoin solution offers the following benefits:
  • Real-time update: whether you’re going on a holiday or a business trip, no problem. You can access your coins all over the world.
  • Instant operations: Aryacoin makes it quite easy for you to use your digital wallet and perform various operations with it.
  • Safe and secure: all your data is stored encrypted and can only be decrypted with your private key, seed, or password.
  • Strong security: The system has no control over your wallet. You are 100% in charge of your wallet and funds.

1.1.5 ARYACOIN FEATURES

1. Anonymity
The coin provides decent level of anonymity for all its users. The users can send their transactions to any of the public nodes to be broadcasted , the transaction sent to the nodes should be signed by the private key of the sender address . This allows the users to use the coin anywhere any time , sending transactions directly to the node allows users from any place and country .
2. Real Life Usage
aryacoin’s team is continuously developing new and innovative ways to use the coins , they are currently developing exchanges where the users can exchange the coins without any fees and any restrictions . They also are currently developing other innovative technologies, which would allow users to spend our coins everywhere and anywhere.
3. Offline Exchanges
They are also working with different offline vendors which would enable them to buy and sell the coins directly to our users on a fixed/variable price this would allow easy buy/sell directly using cash . This would allow the coins to be accessible to users without any restrictions which most of the online exchanges have, also increase the value and number of users along with new ways to spend the coin. This would increase anonymity level of the
coin. In addition, introduce new users into the cryptomarket and technology. Creating a revolution, which educates people about crypto and introduce them to the crypto world, which introduces a completely new group of people into crypto and a move towards a Decentralized future!
4. Transactions
When it comes to transactions, Aryacoin embraces a chain of digital signatures, where each owner simply transfers the coin to the next person by digitally signing a hash of the previous transaction and the public key of the next owner. The recipient can then verify the signatures to confirm the chain of ownership. Importantly, Aryacoin comes with a trusted central authority that checks every transaction for double spending.
5. Business Partner with Simplex
Aryacoin is the first and only Iranian digital currency that managed to obtain a trading license in other countries.
In collaboration with the foundation and financial giant Simplex, a major cryptocurrency company that has large companies such as Binance, P2P, Changelly, etc. Aryacoin has been licensed to enter the world’s major exchanges, as well as the possibility of purchasing AYA through Credit Cards, which will begin in the second half of 2020.
Also, the possibility of purchasing Aryacoin through Visa and MasterCard credit cards will be activated simultaneously inside the Aryacoin site. plus, in less than a year, AYA will be placed next to big names such as CoinCapMarket, Coinomi, P2P, Coinpayments and many other world-class brands today.

1.1.6 WHY CHOOSE ARYACOIN?

If you want to use a cryptocurrency that allows you to keep your privacy online even when buying and selling the coins, the Aryacoin team claims that AYA is the way to go. Aryacoin is putting in the work: with more ways to buy and sell, and fixing the issues that were present in the original Bitcoin, plus pushing the boundaries with innovative solutions in cryptocurrencies. You can get started using Aryacoin (AYA) payments simply by having a CoinPayments account!

1.1.7 ARYANA CENTRALIZED EXCHANGE

Aryana, the first Iranian exchange is a unique platform with the following features:
  • The first real international Persian exchange that obtains international licenses and is listed in CoinMarketCap.
  • The first Iranian exchange that has been cooperating with a legal and European exchange for 3 years.
  • The possibility of trading in Tomans (available currency in Iran) at the user’s desired price and getting rid of the transaction prices imposed by domestic sites inside Iran.
  • There is an internal fee payment plan by Iranian domestic banks for depositing and withdrawing Tomans for Aryacoin holders in Aryana Exchange.
  • The number that you see on the monitor and in your account will be equal to the number that is transferred to your bank account without a difference of one Rial.
  • The last but not least, noting the fact that there is a trading in Tomans possibility in Aryana exchange.
Aryana Exchange is using the most powerful, fastest, and most expensive server in the world, Google Cloud Platform (GCP), which is currently the highest quality server for an Iranian site, so that professional traders do not lag behind the market even for a second.
The feature of Smart Trading Robots is one of the most powerful features for digital currency traders. Digital cryptocurrency traders are well aware of how much they will benefit from smart trading robots. In the Aryana exchange, it is possible to connect exchange user accounts to intelligent trading bots and trade even when they are offline.
The injection of $ 1 million a day in liquidity by the WhiteBite exchange to maintain and support the price of Tether and eliminate the Tether fluctuations with Bitcoin instabilities used by profiteers to become a matter of course.

1.1.8 HOW DOES ARYACOIN WORK?

Aryacoin (AYA) tries to ensure a high level of security and privacy. The team has made sure to eliminate any trading restrictions for the network users: no verification is required to carry out transactions on AYA, making the project truly anonymous, decentralized, and giving it a real use in day-to-day life. The Delayed-Proof-of-Work (dPoW) algorithm makes the Aryacoin blockchain immune to any attempts of a 51% attack. AYA defines a coin as a chain of digital signatures — each owner transfers the coin to the next owner by digitally signing the hash of the previous transaction and the public key of the next owner, and the receiver verifies the signatures and the chain of ownership.

2. ARYACOIN TECHNOLOGY

2.1 PROOF-OF-WORK

They use a proof-of-work system similar to Adam Back’s Hashcash to implement a distributed timestamp server on a peer-to-peer basis, rather than newspaper or Usenet publications. The proof-of-work involves scanning for a value that when hashed, such as with SHA-256, the hash begins with a number of zero bits. The average work required is exponential in the number of zero bits required and can be verified by executing a single hash.
For their timestamp network, they implement the proof-of-work by incrementing a nonce in the block until a value is found that gives the block’s hash the required zero bits. Once the CPU effort has been expended to make it satisfy the proof-of-work, the block cannot be changed without redoing the work. As later blocks are chained after it, the work to change the block would include redoing all the blocks after it.
The proof-of-work also solves the problem of determining representation in majority decision making. If the majority were based on one-IP-address-one-vote, it could be subverted by anyone able to allocate many IPs. Proof-of-work is essentially one-CPU-one-vote. The majority decision is represented by the longest chain, which has the greatest proof-of-work effort invested in it. If honest nodes control a majority of CPU power, the honest chain will grow the fastest and outpace any competing chains. To modify a past
block, an attacker would have to redo the proof-of-work of the block and all blocks after it, then catch up with, and surpass the work of the honest nodes.

2.2 NETWORK

The steps to run the network are as follows:
  • New transactions are broadcast to all nodes.
  • Each node collects new transactions into a block.
  • Each node works on finding a difficult proof-of-work for its block.
  • When a node finds a proof-of-work, it broadcasts the block to all nodes.
  • Nodes accept the block only if all transactions in it are valid and not already spent.
This is a very simple system that makes the network fast and scalable, while also providing a decent level of anonymity for all users. Users can send their transactions to any of the public nodes to be broadcast, and the private key of the sender’s address should sign any transaction sent to the nodes. This way, all transaction info remains strictly confidential. It also allows users to send transactions directly to the node from any place at any time and allows the transferring of huge amounts with very low fees.

2.3 AYAPAY PAYMENT SERVICES GATEWAY:

According to creators Aryacoin, the development team has succeeded in inventing a new blockchain technology for the first time in the world, which is undoubtedly a big step and great news for all digital currency enthusiasts around the world.
This new technology has been implemented on the Aryacoin AYAPAY platform and was unveiled on October 2. AYAPAY payment platform is the only payment gateway in the world that does not save money in users’ accounts and transfers incoming coins directly to any wallet address requested by the gateway owner without any additional transaction or fee.
In other similar systems or even systems such as PayPal, money is stored in the user account.

2.4 CONSENSUS ALGORITHM IN ARYACOIN

The devs introduced the Delayed-Proof-of-Work (dPoW) algorithm, which represents a hybrid consensus method that allows one blockchain to take advantage of the security provided by the hashing power of another blockchain. The AYA blockchain works on dPoW and can use such consensus methods as Proof-of-Work (PoW) or Proof-of-Stake (PoS) and join to any desired PoW blockchain. The main purpose of this is to allow the blockchain to continue operating without notary nodes on the basis of its original consensus method. In this situation, additional security will no longer be provided through the attached blockchain, but this is not a particularly significant problem. dPoW can improve the security level and reduce energy consumption for any blockchain.

2.5 DOUBLE-SPEND PROBLEM AND SOLUTION

One of the main problems in the blockchain world is that a receiver is unable to verify whether or not one of the senders did not double-spend. Aryacoin provides the solution, and has established a trusted central authority, or mint, that checks every transaction for double-spending. Only the mint can issue a new coin and all the coins issued directly from the mint are trusted and cannot be double-spent. However, such a system cannot therefore
be fully decentralized because it depends on the company running the mint, similar to a bank. Aryacoin implements a scheme where the receiver knows that the previous owners did not sign any earlier transactions. The mint is aware of all transactions including which of them arrived first. The developers used an interesting solution called the Timestamp Server, which works by taking a hash of a block of items to be ‘timestamped’ and publishing the hash. Each timestamp includes the previous timestamp in its hash, forming a chain. To modify a block, an attacker would have to redo the proof-of-work of all previous blocks, then catch up with, and surpass the work of the honest nodes. This is almost impossible, and makes the network processes more secure. The proof-of-work difficulty varies according to circumstances. Such an approach ensures reliability and high throughput.

3. ARYACOIN ROADMAP

April 2019: The launch of Aryacoin; AYA ICO, resulting in over 30BTC collected
December 2019: The launch of AYA Pay
April 2020: The successful Hamedan Hardfork, supported by all AYA exchanges, aimed at integrating the dPoW algorithm, improving the security of the AYA blockchain.
June 2020: Aryana Exchange goes live, opening more trading opportunities globally
July 2020: The enabling of our Coin Exchanger
November 2020: The implementation of Smart Contracts into the Aryacoin Ecosystem
Q1 2021: Alef B goes live (more details coming soon)

4. THE NUCYBER NETWORK COMMUNITY & SOCIAL

Website: https://aryacoin.io/
Explorer: https://explorer.aryacoin.io/
Github: https://github.com/Aryacoin/Aryacoin
Twitter: 1.1k followers https://twitter.com/AryacoinAYA
Reddit: 442 members https://github.com/nucypher
Instagram: 3.8k followers https://www.instagram.com/mrdigicoin/ Telegram: 5.9k subscribers https://t.me/AYA_Global

5. SUMMARY

Aryacoin (AYA) is a new age cryptocurrency that combines the best of the blockchain technology and strives to deliver high trading and mining standards, enabling users to make peer-to-peer decentralized transactions of electronic cash. Aryacoin is part of an ecosystem that includes payment gateway Ayapay and the Ayabank. AYA has a partnership with the Microsoft Azure cloud platform, which provides the ability to develop applications and store data on servers located in distributed data centers. The network fee for the AYA Blockchain is 0%. In Ayapay service, which has been developed by the Aryacoin team, all funds without extra fees or costs are directly forwarded to users’ wallets with technology called CloudWithdrawal. The devs team is introducing new use cases including exchanges where users will exchange AYA without any restrictions. You can buy AYA on an exchange of your choice, create an Aryacoin wallet, and store it in Guarda.

6. REFERENCES

1) https://coincodex.com/crypto/aryacoin/
2) https://www.icosandstos.com/coin/Aryacoin%20AYA/YuXO60UPF3
3) https://www.publish0x.com/iran-and-cryptocurrency/a-brief-introduction-of-aryacoin-first-ever-iranian-cryptocu-xoldlom
4) https://techround.co.uk/cryptocurrency/aryacoin-the-digital-currency-created-by-iranians/
5) https://bitcoinexchangeguide.com/aryacoin/
6) https://blog.coinpayments.net/coin-spotlight/aryacoin
7) https://guarda.com/aryacoin-wallet
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Where is Bitcoin Going and When?

Where is Bitcoin Going and When?

The Federal Reserve and the United States government are pumping extreme amounts of money into the economy, already totaling over $484 billion. They are doing so because it already had a goal to inflate the United States Dollar (USD) so that the market can continue to all-time highs. It has always had this goal. They do not care how much inflation goes up by now as we are going into a depression with the potential to totally crash the US economy forever. They believe the only way to save the market from going to zero or negative values is to inflate it so much that it cannot possibly crash that low. Even if the market does not dip that low, inflation serves the interest of powerful people.
The impending crash of the stock market has ramifications for Bitcoin, as, though there is no direct ongoing-correlation between the two, major movements in traditional markets will necessarily affect Bitcoin. According to the Blockchain Center’s Cryptocurrency Correlation Tool, Bitcoin is not correlated with the stock market. However, when major market movements occur, they send ripples throughout the financial ecosystem which necessary affect even ordinarily uncorrelated assets.
Therefore, Bitcoin will reach X price on X date after crashing to a price of X by X date.

Stock Market Crash

The Federal Reserve has caused some serious consternation with their release of ridiculous amounts of money in an attempt to buoy the economy. At face value, it does not seem to have any rationale or logic behind it other than keeping the economy afloat long enough for individuals to profit financially and politically. However, there is an underlying basis to what is going on which is important to understand in order to profit financially.
All markets are functionally price probing systems. They constantly undergo a price-discovery process. In a fiat system, money is an illusory and a fundamentally synthetic instrument with no intrinsic value – similar to Bitcoin. The primary difference between Bitcoin is the underlying technology which provides a slew of benefits that fiat does not. Fiat, however, has an advantage in being able to have the support of powerful nation-states which can use their might to insure the currency’s prosperity.
Traditional stock markets are composed of indices (pl. of index). Indices are non-trading market instruments which are essentially summaries of business values which comprise them. They are continuously recalculated throughout a trading day, and sometimes reflected through tradable instruments such as Exchange Traded Funds or Futures. Indices are weighted by market capitalizations of various businesses.
Price theory essentially states that when a market fails to take out a new low in a given range, it will have an objective to take out the high. When a market fails to take out a new high, it has an objective to make a new low. This is why price-time charts go up and down, as it does this on a second-by-second, minute-by-minute, day-by-day, and even century-by-century basis. Therefore, market indices will always return to some type of bull market as, once a true low is formed, the market will have a price objective to take out a new high outside of its’ given range – which is an all-time high. Instruments can only functionally fall to zero, whereas they can grow infinitely.
So, why inflate the economy so much?
Deflation is disastrous for central banks and markets as it raises the possibility of producing an overall price objective of zero or negative values. Therefore, under a fractional reserve system with a fiat currency managed by a central bank – the goal of the central bank is to depreciate the currency. The dollar is manipulated constantly with the intention of depreciating its’ value.
Central banks have a goal of continued inflated fiat values. They tend to ordinarily contain it at less than ten percent (10%) per annum in order for the psyche of the general populace to slowly adjust price increases. As such, the markets are divorced from any other logic. Economic policy is the maintenance of human egos, not catering to fundamental analysis. Gross Domestic Product (GDP) growth is well-known not to be a measure of actual growth or output. It is a measure of increase in dollars processed. Banks seek to produce raising numbers which make society feel like it is growing economically, making people optimistic. To do so, the currency is inflated, though inflation itself does not actually increase growth. When society is optimistic, it spends and engages in business – resulting in actual growth. It also encourages people to take on credit and debts, creating more fictional fiat.
Inflation is necessary for markets to continue to reach new heights, generating positive emotional responses from the populace, encouraging spending, encouraging debt intake, further inflating the currency, and increasing the sale of government bonds. The fiat system only survives by generating more imaginary money on a regular basis.
Bitcoin investors may profit from this by realizing that stock investors as a whole always stand to profit from the market so long as it is managed by a central bank and does not collapse entirely. If those elements are filled, it has an unending price objective to raise to new heights. It also allows us to realize that this response indicates that the higher-ups believe that the economy could crash in entirety, and it may be wise for investors to have multiple well-thought-out exit strategies.

Economic Analysis of Bitcoin

The reason why the Fed is so aggressively inflating the economy is due to fears that it will collapse forever or never rebound. As such, coupled with a global depression, a huge demand will appear for a reserve currency which is fundamentally different than the previous system. Bitcoin, though a currency or asset, is also a market. It also undergoes a constant price-probing process. Unlike traditional markets, Bitcoin has the exact opposite goal. Bitcoin seeks to appreciate in value and not depreciate. This has a quite different affect in that Bitcoin could potentially become worthless and have a price objective of zero.
Bitcoin was created in 2008 by a now famous mysterious figure known as Satoshi Nakamoto and its’ open source code was released in 2009. It was the first decentralized cryptocurrency to utilize a novel protocol known as the blockchain. Up to one megabyte of data may be sent with each transaction. It is decentralized, anonymous, transparent, easy to set-up, and provides myriad other benefits. Bitcoin is not backed up by anything other than its’ own technology.
Bitcoin is can never be expected to collapse as a framework, even were it to become worthless. The stock market has the potential to collapse in entirety, whereas, as long as the internet exists, Bitcoin will be a functional system with a self-authenticating framework. That capacity to persist regardless of the actual price of Bitcoin and the deflationary nature of Bitcoin means that it has something which fiat does not – inherent value.
Bitcoin is based on a distributed database known as the “blockchain.” Blockchains are essentially decentralized virtual ledger books, replete with pages known as “blocks.” Each page in a ledger is composed of paragraph entries, which are the actual transactions in the block.
Blockchains store information in the form of numerical transactions, which are just numbers. We can consider these numbers digital assets, such as Bitcoin. The data in a blockchain is immutable and recorded only by consensus-based algorithms. Bitcoin is cryptographic and all transactions are direct, without intermediary, peer-to-peer.
Bitcoin does not require trust in a central bank. It requires trust on the technology behind it, which is open-source and may be evaluated by anyone at any time. Furthermore, it is impossible to manipulate as doing so would require all of the nodes in the network to be hacked at once – unlike the stock market which is manipulated by the government and “Market Makers”. Bitcoin is also private in that, though the ledge is openly distributed, it is encrypted. Bitcoin’s blockchain has one of the greatest redundancy and information disaster recovery systems ever developed.
Bitcoin has a distributed governance model in that it is controlled by its’ users. There is no need to trust a payment processor or bank, or even to pay fees to such entities. There are also no third-party fees for transaction processing. As the ledge is immutable and transparent it is never possible to change it – the data on the blockchain is permanent. The system is not easily susceptible to attacks as it is widely distributed. Furthermore, as users of Bitcoin have their private keys assigned to their transactions, they are virtually impossible to fake. No lengthy verification, reconciliation, nor clearing process exists with Bitcoin.
Bitcoin is based on a proof-of-work algorithm. Every transaction on the network has an associated mathetical “puzzle”. Computers known as miners compete to solve the complex cryptographic hash algorithm that comprises that puzzle. The solution is proof that the miner engaged in sufficient work. The puzzle is known as a nonce, a number used only once. There is only one major nonce at a time and it issues 12.5 Bitcoin. Once it is solved, the fact that the nonce has been solved is made public.
A block is mined on average of once every ten minutes. However, the blockchain checks every 2,016,000 minutes (approximately four years) if 201,600 blocks were mined. If it was faster, it increases difficulty by half, thereby deflating Bitcoin. If it was slower, it decreases, thereby inflating Bitcoin. It will continue to do this until zero Bitcoin are issued, projected at the year 2140. On the twelfth of May, 2020, the blockchain will halve the amount of Bitcoin issued when each nonce is guessed. When Bitcoin was first created, fifty were issued per block as a reward to miners. 6.25 BTC will be issued from that point on once each nonce is solved.
Unlike fiat, Bitcoin is a deflationary currency. As BTC becomes scarcer, demand for it will increase, also raising the price. In this, BTC is similar to gold. It is predictable in its’ output, unlike the USD, as it is based on a programmed supply. We can predict BTC’s deflation and inflation almost exactly, if not exactly. Only 21 million BTC will ever be produced, unless the entire network concedes to change the protocol – which is highly unlikely.
Some of the drawbacks to BTC include congestion. At peak congestion, it may take an entire day to process a Bitcoin transaction as only three to five transactions may be processed per second. Receiving priority on a payment may cost up to the equivalent of twenty dollars ($20). Bitcoin mining consumes enough energy in one day to power a single-family home for an entire week.

Trading or Investing?

The fundamental divide in trading revolves around the question of market structure. Many feel that the market operates totally randomly and its’ behavior cannot be predicted. For the purposes of this article, we will assume that the market has a structure, but that that structure is not perfect. That market structure naturally generates chart patterns as the market records prices in time. In order to determine when the stock market will crash, causing a major decline in BTC price, we will analyze an instrument, an exchange traded fund, which represents an index, as opposed to a particular stock. The price patterns of the various stocks in an index are effectively smoothed out. In doing so, a more technical picture arises. Perhaps the most popular of these is the SPDR S&P Standard and Poor 500 Exchange Traded Fund ($SPY).
In trading, little to no concern is given about value of underlying asset. We are concerned primarily about liquidity and trading ranges, which are the amount of value fluctuating on a short-term basis, as measured by volatility-implied trading ranges. Fundamental analysis plays a role, however markets often do not react to real-world factors in a logical fashion. Therefore, fundamental analysis is more appropriate for long-term investing.
The fundamental derivatives of a chart are time (x-axis) and price (y-axis). The primary technical indicator is price, as everything else is lagging in the past. Price represents current asking price and incorrectly implementing positions based on price is one of the biggest trading errors.
Markets and currencies ordinarily have noise, their tendency to back-and-fill, which must be filtered out for true pattern recognition. That noise does have a utility, however, in allowing traders second chances to enter favorable positions at slightly less favorable entry points. When you have any market with enough liquidity for historical data to record a pattern, then a structure can be divined. The market probes prices as part of an ongoing price-discovery process. Market technicians must sometimes look outside of the technical realm and use visual inspection to ascertain the relevance of certain patterns, using a qualitative eye that recognizes the underlying quantitative nature
Markets and instruments rise slower than they correct, however they rise much more than they fall. In the same vein, instruments can only fall to having no worth, whereas they could theoretically grow infinitely and have continued to grow over time. Money in a fiat system is illusory. It is a fundamentally synthetic instrument which has no intrinsic value. Hence, the recent seemingly illogical fluctuations in the market.
According to trade theory, the unending purpose of a market or instrument is to create and break price ranges according to the laws of supply and demand. We must determine when to trade based on each market inflection point as defined in price and in time as opposed to abandoning the trend (as the contrarian trading in this sub often does). Time and Price symmetry must be used to be in accordance with the trend. When coupled with a favorable risk to reward ratio, the ability to stay in the market for most of the defined time period, and adherence to risk management rules; the trader has a solid methodology for achieving considerable gains.
We will engage in a longer term market-oriented analysis to avoid any time-focused pressure. The Bitcoin market is open twenty-four-hours a day, so trading may be done when the individual is ready, without any pressing need to be constantly alert. Let alone, we can safely project months in advance with relatively high accuracy. Bitcoin is an asset which an individual can both trade and invest, however this article will be focused on trading due to the wide volatility in BTC prices over the short-term.

Technical Indicator Analysis of Bitcoin

Technical indicators are often considered self-fulfilling prophecies due to mass-market psychology gravitating towards certain common numbers yielded from them. They are also often discounted when it comes to BTC. That means a trader must be especially aware of these numbers as they can prognosticate market movements. Often, they are meaningless in the larger picture of things.
  • Volume – derived from the market itself, it is mostly irrelevant. The major problem with volume for stocks is that the US market open causes tremendous volume surges eradicating any intrinsic volume analysis. This does not occur with BTC, as it is open twenty-four-seven. At major highs and lows, the market is typically anemic. Most traders are not active at terminal discretes (peaks and troughs) because of levels of fear. Volume allows us confidence in time and price symmetry market inflection points, if we observe low volume at a foretold range of values. We can rationalize that an absolute discrete is usually only discovered and anticipated by very few traders. As the general market realizes it, a herd mentality will push the market in the direction favorable to defending it. Volume is also useful for swing trading, as chances for swing’s validity increases if an increase in volume is seen on and after the swing’s activation. Volume is steadily decreasing. Lows and highs are reached when volume is lower.
Therefore, due to the relatively high volume on the 12th of March, we can safely determine that a low for BTC was not reached.
  • VIX – Volatility Index, this technical indicator indicates level of fear by the amount of options-based “insurance” in portfolios. A low VIX environment, less than 20 for the S&P index, indicates a stable market with a possible uptrend. A high VIX, over 20, indicates a possible downtrend. VIX is essentially useless for BTC as BTC-based options do not exist. It allows us to predict the market low for $SPY, which will have an indirect impact on BTC in the short term, likely leading to the yearly low. However, it is equally important to see how VIX is changing over time, if it is decreasing or increasing, as that indicates increasing or decreasing fear. Low volatility allows high leverage without risk or rest. Occasionally, markets do rise with high VIX.
As VIX is unusually high, in the forties, we can be confident that a downtrend for the S&P 500 is imminent.
  • RSI (Relative Strength Index): The most important technical indicator, useful for determining highs and lows when time symmetry is not availing itself. Sometimes analysis of RSI can conflict in different time frames, easiest way to use it is when it is at extremes – either under 30 or over 70. Extremes can be used for filtering highs or lows based on time-and-price window calculations. Highly instructive as to major corrective clues and indicative of continued directional movement. Must determine if longer-term RSI values find support at same values as before. It is currently at 73.56.
  • Secondly, RSI may be used as a high or low filter, to observe the level that short-term RSI reaches in counter-trend corrections. Repetitions based on market movements based on RSI determine how long a trade should be held onto. Once a short term RSI reaches an extreme and stay there, the other RSI’s should gradually reach the same extremes. Once all RSI’s are at extreme highs, a trend confirmation should occur and RSI’s should drop to their midpoint.

Trend Definition Analysis of Bitcoin

Trend definition is highly powerful, cannot be understated. Knowledge of trend logic is enough to be a profitable trader, yet defining a trend is an arduous process. Multiple trends coexist across multiple time frames and across multiple market sectors. Like time structure, it makes the underlying price of the instrument irrelevant. Trend definitions cannot determine the validity of newly formed discretes. Trend becomes apparent when trades based in counter-trend inflection points continue to fail.
Downtrends are defined as an instrument making lower lows and lower highs that are recurrent, additive, qualified swing setups. Downtrends for all instruments are similar, except forex. They are fast and complete much quicker than uptrends. An average downtrend is 18 months, something which we will return to. An uptrend inception occurs when an instrument reaches a point where it fails to make a new low, then that low will be tested. After that, the instrument will either have a deep range retracement or it may take out the low slightly, resulting in a double-bottom. A swing must eventually form.
A simple way to roughly determine trend is to attempt to draw a line from three tops going upwards (uptrend) or a line from three bottoms going downwards (downtrend). It is not possible to correctly draw a downtrend line on the BTC chart, but it is possible to correctly draw an uptrend – indicating that the overall trend is downwards. The only mitigating factor is the impending stock market crash.

Time Symmetry Analysis of Bitcoin

Time is the movement from the past through the present into the future. It is a measurement in quantified intervals. In many ways, our perception of it is a human construct. It is more powerful than price as time may be utilized for a trade regardless of the market inflection point’s price. Were it possible to perfectly understand time, price would be totally irrelevant due to the predictive certainty time affords. Time structure is easier to learn than price, but much more difficult to apply with any accuracy. It is the hardest aspect of trading to learn, but also the most rewarding.
Humans do not have the ability to recognize every time window, however the ability to define market inflection points in terms of time is the single most powerful trading edge. Regardless, price should not be abandoned for time alone. Time structure analysis It is inherently flawed, as such the markets have a fail-safe, which is Price Structure. Even though Time is much more powerful, Price Structure should never be completely ignored. Time is the qualifier for Price and vice versa. Time can fail by tricking traders into counter-trend trading.
Time is a predestined trade quantifier, a filter to slow trades down, as it allows a trader to specifically focus on specific time windows and rest at others. It allows for quantitative measurements to reach deterministic values and is the primary qualifier for trends. Time structure should be utilized before price structure, and it is the primary trade criterion which requires support from price. We can see price structure on a chart, as areas of mathematical support or resistance, but we cannot see time structure.
Time may be used to tell us an exact point in the future where the market will inflect, after Price Theory has been fulfilled. In the present, price objectives based on price theory added to possible future times for market inflection points give us the exact time of market inflection points and price.
Time Structure is repetitions of time or inherent cycles of time, occurring in a methodical way to provide time windows which may be utilized for inflection points. They are not easily recognized and not easily defined by a price chart as measuring and observing time is very exact. Time structure is not a science, yet it does require precise measurements. Nothing is certain or definite. The critical question must be if a particular approach to time structure is currently lucrative or not.
We will measure it in intervals of 180 bars. Our goal is to determine time windows, when the market will react and when we should pay the most attention. By using time repetitions, the fact that market inflection points occurred at some point in the past and should, therefore, reoccur at some point in the future, we should obtain confidence as to when SPY will reach a market inflection point. Time repetitions are essentially the market’s memory. However, simply measuring the time between two points then trying to extrapolate into the future does not work. Measuring time is not the same as defining time repetitions. We will evaluate past sessions for market inflection points, whether discretes, qualified swings, or intra-range. Then records the times that the market has made highs or lows in a comparable time period to the future one seeks to trade in.
What follows is a time Histogram – A grouping of times which appear close together, then segregated based on that closeness. Time is aligned into combined histogram of repetitions and cycles, however cycles are irrelevant on a daily basis. If trading on an hourly basis, do not use hours.
  • Yearly Lows (last seven years): 1/1/13, 4/10/14, 1/15/15, 1/17/16, 1/1/17, 12/15/18, 2/6/19
  • Monthly Mode: 1, 1, 1, 1, 2, 4, 12
  • Daily Mode: 1, 1, 6, 10, 15, 15, 17
  • Monthly Lows (for the last year): 3/12/20 (10:00pm), 2/28/20 (7:09am), 1/2/20 (8:09pm), 12/18/19 (8:00am), 11/25/19 (1:00am), 10/24/19 (2:59am), 9/30/19 (2:59am), 8/29,19 (4:00am), 7/17/19 (7:59am), 6/4/19 (5:59pm), 5/1/19 (12:00am), 4/1/19 (12:00am)
  • Daily Lows Mode for those Months: 1, 1, 2, 4, 12, 17, 18, 24, 25, 28, 29, 30
  • Hourly Lows Mode for those Months (Military time): 0100, 0200, 0200, 0400, 0700, 0700, 0800, 1200, 1200, 1700, 2000, 2200
  • Minute Lows Mode for those Months: 00, 00, 00, 00, 00, 00, 09, 09, 59, 59, 59, 59
  • Day of the Week Lows (last twenty-six weeks):
Weighted Times are repetitions which appears multiple times within the same list, observed and accentuated once divided into relevant sections of the histogram. They are important in the presently defined trading time period and are similar to a mathematical mode with respect to a series. Phased times are essentially periodical patterns in histograms, though they do not guarantee inflection points
Evaluating the yearly lows, we see that BTC tends to have its lows primarily at the beginning of every year, with a possibility of it being at the end of the year. Following the same methodology, we get the middle of the month as the likeliest day. However, evaluating the monthly lows for the past year, the beginning and end of the month are more likely for lows.
Therefore, we have two primary dates from our histogram.
1/1/21, 1/15/21, and 1/29/21
2:00am, 8:00am, 12:00pm, or 10:00pm
In fact, the high for this year was February the 14th, only thirty days off from our histogram calculations.
The 8.6-Year Armstrong-Princeton Global Economic Confidence model states that 2.15 year intervals occur between corrections, relevant highs and lows. 2.15 years from the all-time peak discrete is February 9, 2020 – a reasonably accurate depiction of the low for this year (which was on 3/12/20). (Taking only the Armstrong model into account, the next high should be Saturday, April 23, 2022). Therefore, the Armstrong model indicates that we have actually bottomed out for the year!
Bear markets cannot exist in perpetuity whereas bull markets can. Bear markets will eventually have price objectives of zero, whereas bull markets can increase to infinity. It can occur for individual market instruments, but not markets as a whole. Since bull markets are defined by low volatility, they also last longer. Once a bull market is indicated, the trader can remain in a long position until a new high is reached, then switch to shorts. The average bear market is eighteen months long, giving us a date of August 19th, 2021 for the end of this bear market – roughly speaking. They cannot be shorter than fifteen months for a central-bank controlled market, which does not apply to Bitcoin. (Otherwise, it would continue until Sunday, September 12, 2021.) However, we should expect Bitcoin to experience its’ exponential growth after the stock market re-enters a bull market.
Terry Laundy’s T-Theory implemented by measuring the time of an indicator from peak to trough, then using that to define a future time window. It is similar to an head-and-shoulders pattern in that it is the process of forming the right side from a synthetic technical indicator. If the indicator is making continued lows, then time is recalculated for defining the right side of the T. The date of the market inflection point may be a price or indicator inflection date, so it is not always exactly useful. It is better to make us aware of possible market inflection points, clustered with other data. It gives us an RSI low of May, 9th 2020.
The Bradley Cycle is coupled with volatility allows start dates for campaigns or put options as insurance in portfolios for stocks. However, it is also useful for predicting market moves instead of terminal dates for discretes. Using dates which correspond to discretes, we can see how those dates correspond with changes in VIX.
Therefore, our timeline looks like:
  • 2/14/20 – yearly high ($10372 USD)
  • 3/12/20 – yearly low thus far ($3858 USD)
  • 5/9/20 – T-Theory true yearly low (BTC between 4863 and 3569)
  • 5/26/20 – hashrate difficulty halvening
  • 11/14/20 – stock market low
  • 1/15/21 – yearly low for BTC, around $8528
  • 8/19/21 – end of stock bear market
  • 11/26/21 – eighteen months from halvening, average peak from halvenings (BTC begins rising from $3000 area to above $23,312)
  • 4/23/22 – all-time high
Taken from my blog: http://aliamin.info/2020/
submitted by aibnsamin1 to Bitcoin [link] [comments]

A guide to Smart Contracts

A guide to Smart Contracts

https://preview.redd.it/ysi74g2vn3251.png?width=1920&format=png&auto=webp&s=63875e316556c41144ad81cf061caf5bb3f4680d
We all have heard the term Smart Contract. When Satoshi invented Blockchain, it was meant to perform transactions only. Ethereum smart contracts made it the prime choice to build Dapps over it. Smart contract enhanced Ethereum’s functionality and makes it different from the traditional blockchain (Bitcoin). This functionality was replicated by other newer Blockchains.
What are Smart Contracts?
Smart contracts can be defined as self-executing applications that run on a blockchain. It is an agreement between two or more parties in the form of a computer code that runs on a decentralized network in a blockchain. It consists of a set of defined rules which are agreed upon by the involved parties. The contract automatically gets activated whenever certain conditions are met.
This idea will remove the involvement of any trusted third-party companies (such as banks) and will be controlled by computers on a trusted network.
Ethereum is one of the most popular blockchain platforms for creating smart contracts. It supports a feature called Turing-completeness that enables the developers to build customized smart contracts. Solidity, Ethereum’s original coding language is used to develop smart contracts. Ethereum blockchain's ERC-20 and ERC-721 tokens are smart contract standards.
Who created it?
Nick Szabo, a computer scientist, and cryptographer, first described the idea of Smart contracts in the ‘90s. He worked on the concept of defining contract laws in businesses between parties by maintaining an electronic commerce protocol on the Internet.
He further designed Bit Gold, a mechanism for a decentralized digital currency in 1998. Though the idea was never implemented it created a base that led to the popularity of Bitcoin after 10 years.
Properties:
· Self-verifiable
· Self-executable
· Tamper Proof
Benefits of using Smart Contract
· The removal of third-party or middleman leads to direct and transparent communication between involving parties
· Helps in maintaining trust as the agreement rules were predefined and agreed by the parties involved
· Helps in reducing error and frauds
· Time and cost-efficient
· No single point of failure or data loss as data is distributed across the network

https://preview.redd.it/1e5ahcqxn3251.png?width=1024&format=png&auto=webp&s=f8a1ebb9b3a84dd721fb32f96fc1950899bc3015
Different objects of Smart contracts
There are three essential and main objects of Smart Contracts
· Signatories- The parties who use the smart contract.
· Agreement subject
· Terms and Condition-. Details like rules, obligations, and associated punishments, etc are mentioned as terms and conditions as appropriate.
How Smart Contract works
Ethereum has 2 types of accounts
· External accounts (user account) - Controlled by public-private key pairs
· Contract accounts - Controlled by the code stored together with the account
These accounts contain four fields:
· The nonce, which ensures that each transaction can only be processed once
· The current ether balance of the account
· The contract code of the account
· The storage of the account
Model steps
  1. External account executes a function:
a. The user initiates the process by signing the transaction using his private key corresponding to the account.
b. Local validation of the transaction happens. It is broadcasted to the network.
c. The transaction is added to the transaction pool. The mines maintains such pools.
  1. Generate EVM bytecode through compiling
  2. EVM
a. EVM is a powerful, virtual sandbox embedded within each full Ethereum node
b. The job of the EVM is to update the Ethereum state by computing valid state transitions as a result of smart contact code execution
c. The EVM should not run into any exceptions during the execution
  1. Get contract address from that transaction's receipt
  2. Trigger contract address to invoke methods of that deployed smart contract
  3. Upon receiving a newly created block, the local node executes all the transactions in the block.
The accuracy and quality of a smart contract depends on the following things
· Open and decentralized database
· The environment needs to support the use of public-key cryptography
· Quality programming is crucial.
· Data should be reliable.
· Robust rules should be used while automating the process.
Features
Smart contracts automatically support the features of underlying blockchain technology.
· Autonomy – Complete control of the involving parties. No need of middleman as in the case of traditional contractual system
· Speed – Automated computer code runs as soon as the input criteria fulfill, thereby eliminating the delays caused by manual paperwork activity
· Safety – Network encryption guarantees safety against data theft or hacking
· Savings – No doubt that the removal of middleman saves a lot of overall cost and time
· Accuracy – Since these smart contracts are automated software codes so they ensure accurate output as long as the data fed into the system as input is accurate
· Trust – Helps in building trust as the documents are encrypted in a shared ledger
· Backup – Since in Blockchain network, each node has a complete backup of data which ensures protection over data loss
Potential Use cases
Smart contracts can be used to exchange money, property, shares, or anything without any intervention of middleman. They are now gaining popularity and adaption in various sectors. Some of the main sectors are as follows:-
· Insurance Companies
· Health Systems
· Government’s administrative work.
· Business Management
I will cover each of the potential use cases in detail in my future articles separately.
Conclusion
Smart Contract is the greatest innovation built on Blockchain technology. We can say it as a cherry over the pie. It has given a new dimension to technology and is one of the biggest reasons behind the popularity of Ethereum.
We can say without any second thought that very soon we will be entering into the era where there will be no intervention of any third party. In this way, it can help us in saving a lot of money, time, and effort. Also, we don’t need to be dependent or trust anyone while taking any crucial transactions. This will surely help in reducing fraud, unnecessary delays, and the overall cost of transactions. Smart Contracts will make many transactional jobs redundant. We can be hopeful that further development in technology will open sources for many other new jobs.
Read More: Understanding Hard Fork
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submitted by RumaDas to BlockChain_info [link] [comments]

BetHash - How Provably Fair Isn't as Fair as it Looks

BetHash - How Provably Fair Isn't as Fair as it Looks
https://preview.redd.it/sm725nui67441.png?width=1020&format=png&auto=webp&s=20a9e7ff2f304064facd7be546e1f0ec2548daee
In our previous post, we took a look at how Bethash uses an entirely new system to prove fairness, as compared to cryptocurrency casinos that use an older system, known as ‘provably fair’.
In this article, we will explore the practicality of an absolutely fair casino and identify some of the flaws that exist in the provably fair system. These issues, in addition to some other limitations of the technology, are what prompted the BetHash team to begin using blockchain-based provable fairness.

Quick Recap on Fairness: 3 versus 21

If you remember correctly, our previous article explained the basics of how the provably fair system works. The provably fair system works because of 3 components: the server seed, client seed, and the nonce.
Now, for the sake of argument, if any two of these three components are compromised, then the security of the provably fair system breaks down. We will get into the specifics of how this might occur in the next section.
The way BetHash differs here is in fact of a simple numbers game. Instead of relying on three components as per typical provably fair casinos, BethHash relies on the 21 block producers of the EOS blockchain network.
As we have previously explained, the EOS network has a decentralized network of 21 block producers that secure the blockchain network against mutability. If you were to somehow trying to alter the results of BetHash, you would first have to first corrupt at least 11 of the 21 EOS block producers, which is a practically impossible task, since each block producer is voted into position by tens of thousands of EOS users.
Because of this, subvert even one of the EOS block producers is a nigh-impossible task, since every EOS block producer is a well-known, reputable force in the EOS community.

How is the Provably Fair System Corruptible?

The answer to this question lies more in human error and human nature rather than the technology itself. The implementation of the provably fair system differs from casino to casino, which can mean different casinos have loopholes not present in most others.
Then comes the concept of a Zero-day attack. Consider this; the first generation of online casinos used random number generators (RNGs) to ensure fairness until it was discovered that RNGs were not secured enough. This was primarily due to the faulty implementation of the number generation algorithm. A great example is this case, where one person was able to accurately figure out how the cards were being shuffled in an online poker game, despite them being arranged using random numbers.
A Zero-day attack can be defined as the exploitation of faulty code or faulty implementation of a perfectly fine code despite the implementor (in this case, a casino) knowing about this vulnerability. With this in mind, let's take a look at two examples of how a provably fair system could have hidden vulnerabilities:

Example 1: Nonce overflow

This vulnerability has to do with a faulty way of storing the nonce in an unsecured unsigned integer variable. This could, in turn, lead the nonce variable to overflow after a certain number of bets have been made and cause it to return 0, resulting in every future roll to become predictable.
For a detailed explanation of how a Nonce overflow flaw works, visit this article.

Example 2: Force-It Box

In this second example, one programmer was able to detect two vulnerabilities in the way the provably fair system was implemented by one bitcoin dice site. First, the programmer discovered that there was no way for the client-side seed to be entered in the roll, which meant the website could still manipulate the results.
But the second and the bigger vulnerability was caused by the fact that the starting seed was exposed, giving anyone with enough gusto the ability to brute force the encryption and predict all the rolls.
For a detailed overview of how the Force-It Box vulnerability works, visit this GitHub post.

In Summary

As you can see, although implementing a provably fair system is certainly a step in the right direction towards fairness, faulty implementations can cause the system to break down. On the other hand, with BetHash you are putting your trust in 21 incorruptible factors (EOS block producers) making BetHash a pioneering endeavor towards the evolution of fairness in online games.
https://preview.redd.it/kbv1rwfh67441.png?width=1080&format=png&auto=webp&s=a79ef3286f81ccfe2a2473ee88ec2335e93c7e8a
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submitted by bethashio to bethashcasino [link] [comments]

NEO vs Other dApp Platforms

Functionally, dApp platforms should be capable of the same things (depending on their VMs, I suppose). This means the distinguishing properties are:
Decentralization
True decentralization requires sufficient network distribution, meaning nodes in lots of places. This increases the fault tolerance of the network (many nodes can go down without affecting consensus). dBFT/dPoS both opt for a lower number of nodes, which increases scalability and finality. In these designs, the goal is to have enough nodes to be sufficiently architecturally decentralized whilst retaining those other benefits.
Decentralization also requires strict lack of control over consensus (high political decentralization). This means there are no singular entities or groups of entities in control of what goes into blocks, or which blocks are valid. Since these entities (nodes, block producers, miners) are governing the blocks, they cannot be allowed consistent control over what should go in a block.
In PoW and PoS, the network aims to achieve this decentralization by incentivizing users to take part in consensus. Lots of users proposing blocks means lots of decentralization, no trust required. But users are doing this for incentives. They will do whatever incentivizes them (principle of economics). So if they don't have much of a chance at mining their own block, they earn nothing. So they join a pool instead, where they get some profit rather than no profit. That pool becomes larger. It earns a larger share of block rewards. The cycle repeats.
Eventually, consensus is totally controlled by mining pools, with ever-growing percentages of the total hash rate. The network becomes centralized again. Ultimately there are only a few individuals proposing the blocks for a mining pool. If they wanted to stop your transactions, they could. The miners/stakers are not involved in the process. A large enough percentage of the hash rate cannot become aware of false blocks within the hours (if not minutes in PoS) it would take to seriously damage the network and require a fork (likely would not go down well with these real use cases hmm).
Trust (for both honesty and competency) is required to use the network from this point forward, which is strictly worse than using the existing centralized options (e.g your bank) where there are at least some (though shitty) legal ramifications to malicious activity.
A consensus mechanism that gives incentives to users to create blocks using block rewards will eventually self-cannibalize, and become a plutocracy (centralized). This has proven to be the case with Bitcoin, Ethereum and will continue to occur for every PoW/PoS/dPoS network as a consequence of their design.
NEO requires a steady roll out of nodes, instead of the rapid expansion of mining/staking mechanisms. The benefit is that the number can be balanced for scalability, and the network can operate without overly incentivizing node-runners. Our consensus mechanism has lots of improvements to be made, but it is fundamentally a more efficient approach.
Scalability and Finality
This is simpler. It's a question of how efficient is consensus, and how many nodes need to get the message (and how far away are they all). Scalability is how many transactions can be processed each moment. Finality is how rapidly they can be confirmed as unchangeable truth.
PoW has users testing nonces to generate hashes, allowing them to claim a block as valid, spread it and earn the reward. This is both highly inefficient with energy, but also highly inefficient at reaching consensus. The networks are massive because it is such an open process, but that means it takes a lot of time for everyone to agree with each other. They also need confirmations to be certain, because it is possible for other miners to fork and change the longest chain (and therefore truth). This is incredibly slow and inherently flawed.
PoS has users staking, which skips the mining for a great efficiency boost, but still takes oodles of time for each user to get the message. Scaling is marginally improved (4-5x), still not a noteworthy amount considering that is compared to the awful scaling of PoW (a few transactions a second). However, it also relies on incentives. If you aren't rich enough to stake for blocks, you get no rewards. So you join a pool. The pool starts earning a larger percentage of block rewards. More people join. You know where this is going.
PoA has trust. No really, that's all it is really. It's like dBFT except you gotta trust these guys points at those guys who are trustworthy, honest. They might be trustworthy. They might not be. PoA is the halfway step to decentralized consensus mechanisms. They realize they can gain scalability by restricting the number of nodes, but they don't give up control by using true delegation. The network is fast, but political centralization exists.
dBFT is the simplest solution. Don't incentivize users to produce blocks. Incentivize them to govern the network. Owning NEO lets you decide who runs nodes. You get the fees from the network being used. Consensus nodes gets transaction fees as a tip (perhaps one day even without any incentive at all).
Consensus is fast, you just check to see if a block is valid according to defined criteria. Get block, validate, sign, pass it on. Much more efficient that PoS, which is why the TPS is so much higher (potential of hundreds or thousands). It also means nodes agree on blocks quicker and can't change blocks, meaning transactions are final as soon as they are on the blockchain. No confirmations required, pretty important for the user experience. A transaction that actually takes 20 or 10 or 5 seconds instead of minutes or hours.
dBFT preserves political decentralization through a fair voting system, and has the required network architecture for high scalability. The instant, same-block finality is the cherry on top.
Quality of Ecosystem
This is subjective. Do you like lots of spammed, unaudited smart contracts that can be malicious, useless or incompetently created? Do you like a few highly impressive projects but with the caveat of trust? Or do you like an entire growing ecosystem that is being funded and supported by the very organization that founded the ecosystem?
Just take a few minutes on each of the projects in our ecosystem. The quality of work is astounding. The potential is unlimited. And every day, the ecosystem grows and connects together in a more seamless manner.
Compared to the tumbleweeds, rivers of shitty dApps or permanent centralization of other platforms, NEO is a frankly very exciting place to be.
submitted by Edgegasm to NEO [link] [comments]

Notes from Ethereum Core Devs Meeting #31 [1/12/18]

The next core dev meeting will be this Friday, January 26, 2018. The agenda and live stream link are located here.

Ethereum Core Devs Meeting 31 Notes

Meeting Date/Time: Friday 01/12/18 at 14:00 UTC

Meeting Duration: 1.5 hours

GitHub Agenda Page

Audio/Video of the meeting

Reddit thread

Agenda

  1. Testing Updates.
  2. Yellow paper update.
  3. EWASM update + update on the following related EIPs. a. EVM 2.0 - https://github.com/ethereum/EIPs/issues/48 b. Extend DUP1-16 / SWAP1-16 With DUPN / SWAPN - https://github.com/ethereum/EIPs/issues/174 c. Subroutines and Static Jumps for the EVM - https://github.com/ethereum/EIPs/issues/615
  4. Stateless client development.
  5. Add ECADD and ECMUL precompiles for secp256k1 - https://github.com/ethereum/EIPs/issues/603 [See this blog post for context].
  6. Introduce miner heuristic "Child pays for parent" (like in BTC) to combat the weird cases when transactions with 1000 Gwei stuck in the mempool (because they are dependent via nonce on transaction paying much less and not getting mined).
  7. Creating a relay network of nodes to mitigate issues described here and other transaction propagation issues.
  8. Fork release management/Constantinople.
  9. Client updates.
  10. Other non-agenda issues.

Notes

Video starts at [4:36].

[4:56] 1. Testing Updates

No updates.

[5:27] 2. Yellow paper update.

Gavin put the Yellow Paper under the Creative Commons Free Culture License CC-BY-SA. Yoichi and Nick Savers have been making progress handling the Yellow Paper PRs. There is still the somewhat unresolved issue of what should define the "formal standard" of Ethereum and should an update to the Yellow Paper or another specification be required for every new EIP. This can be discussed in more detail in future meetings when there is greater attendance.

[7:43] 3. EWASM update + update on the following related EIPs.

[7:55] General update

Ewasm contributors are currently meeting in person together in Lisbon. EWASM EIPs listed in the subpoints are not up to date and can be disregarded. People should use the github.com/EWASM/design repo. The design has been pretty much speced out in the last year. During the design phase there were 2 implementations done in parallel: Javascript and C++ (which can be integrated in cpp-ethereum and geth). Issues have been faced in building out EWASM including struggling with implementing synchronous code in Javascript/browser. Idea was to move to an asynchronous model. Currently there is not a full decision on using synchronous vs asynchronous, but we are leaning towards synchronous implementation in C++ to run a testnet in cpp-ethereum that can run pure Web Assembly contracts. Metering contract in Web Assembly is on the to-do list and doesn't rely on sync/async decision. Likely will take week to come to a decision on sync vs async. More technical discussion and a funny anecdote involving the asynchronous vs synchronous decision and the affects of the recent Spectre/Meltdown attacks start at [12:07].

[15:08] a. EVM 2.0 - https://github.com/ethereum/EIPs/issues/48

Martin Becze will be closing this EIP. It is outdated.

[15:28] b. Extend DUP1-16 / SWAP1-16 With DUPN / SWAPN - https://github.com/ethereum/EIPs/issues/174

This doesn't have to do with EWASM, it has to do with adding extra opcodes in the current EVM. It is an upgrade to EVM 1.0 which is not needed if we skip straight to EWASM.

[16:47] c. Subroutines and Static Jumps for the EVM - https://github.com/ethereum/EIPs/issues/615

Greg has been working with Seed (Gitter tag) who is writing an ELM formalization of the EIP. Greg says that there is no formal social process for deciding things like EVM 1.5 implementation so he is not sure if/when it would be implemented. Greg has been working on cleaning up the proposal for those who want to use it. Greg has some ideas around an EVM 3.0 that pulls everything together with transpilation that he hasn't started working on yet and is not sure if he will.

[20:14] 4. Stateless client development.

Piper left some comments about some development of a stateless client for sharding, but it is very early. Alexey had a blog post describing stateless clients he may re-approach later.

[21:46] 5. Add ECADD and ECMUL pre-compiles for secp256k1 - https://github.com/ethereum/EIPs/issues/603 [See this blog post for context].

This topic was brought up months ago with mixed commentary. Christian R. says that ECADD and ECMUL were never intended to be used for general purpose cryptography, but rather it was suppose to be used in conjunction with the pairing pre-compiles for a specific curve that is pairing friendly. Christian says that in the past it has been discussed that there must be a very compelling reason for adding a pre-compile to Ethereum. Silur mentioned that the Monero research team is working on a new ring signature (still unnamed) that can be viewed in the Monero repository. The EWASM team may run some tests to compare native running of the pre-compiles vs EWASM. Adding a new pre-compile would only give a constant speed-up or reduction in cost, but if we achieve the same thing in new virtual machine it will give us a constant speed-up for every conceivable routine and allows for building other schemes like Casper and TrueBit. This is easier with Web Assembly because we can use existing C code. For the moment it looks like focusing energy on adding these proposed pre-compiles would not be worth it compared to just waiting for the next VM (likely EWASM) which will allow far more speed-ups across all computational routines.

[37:00] 6. Introduce miner heuristic "Child pays for parent" (like in BTC) to combat the weird cases when transactions with 1000 Gwei stuck in the mempool (because they are dependent via nonce on transaction paying much less and not getting mined).

[Note: I tried my best to cover what was discussed here, but I am not an expert in Ethereum transactions. If you find a mistake please point it out to me. Thanks!] Agenda item brought up to get people's opinion on this topic. Currently in Ethereum there are transactions that are stuck in the mempool for a long time because of the way transaction ordering per account is handled. The nonce of a transaction must be greater than the previous mined transactions (or equal if you are trying to replace a transaction). For example you can't process transaction #27 before transaction #26 has been mined. Many of the stuck transactions are dependent on other transactions that pay a much smaller fee, but are not being mined. It seems people inadvertently send an initial transaction with too small of a fee and then more transactions at a higher nonce with a much higher fee that cannot be processed until the first small fee transaction is processed. Alexey wondered if this may pose an attack vector or if we would get a benefit from implementing "child pays for parent" like Bitcoin does. Peter explained even if you define the max amount of gas your transaction could potentially consume, there is no guarantee it will use that much and we won't know until the transaction is processed (the only guarantee is that 21,000 gas will be consumed - a plain ether transfer). The attack vector example would be someone pushing a transaction that truly consumes 3,000,000 gas and attach a transaction fee of 1 wei and then push another TX that claims to consume 3,000,000 gas but with a transaction fee of 1000gwei. From the outside it looks like I can both can be executed for profit from the miner's perspective, but in reality the 2nd transaction will be processed first and the 1st tx will be long running and indirectly punish the miner. Alexey was concerned about the mempool filling up and impact on clients due to the way nonces are handled. Peter clarified that transactions in the mempool in the go ethereum client only maintains the top 4,000 most expensive transactions. If your cheap transaction gets evicted, the expensive transactions you stacked on top of it get evicted as well because they are no longer executable due to the nonce.

[42:21] 7. Creating a relay network of nodes to mitigate issues described here and other transaction propagation issues.

A relay network in general is a group of peers and/or miners who use a peer list to quickly connect to a group of known peers before connecting to (or instead of connecting to) random peers using network discovery. Alexey conjectured that this may create a powerful ring of network players who can share transactions very quickly and hurt the little guys on the outside (hurting the idea of this being a mesh network of peers). Clarifications were made about the issues involving transaction propagation issues with nodes with high transaction throughput such as Infura and Bittrex. Clients suddenly stop pushing transactions or cannot keep up with the blockchain when they are pushing out so many transactions. Hudson will work towards exploring this issue more and connecting the people with the issues with the devs.

[49:45] 8. Fork release management/Constantinople.

Hudson will be working on writing up a starting plan to discuss potential release management issues. BitsBeTripping sent Hudson some good material about project management that he will review and bring to the next meeting. We need to start discussing Constantinople sooner rather than later.

[52:55] 9. Client updates.

10. Other non-agenda items

[1:05:42] Question: Will we see any scaling improvements from Constantinople?

Answer is no because it potentially includes the first steps of the Casper consensus protocol and some account abstraction EIPs, but both of those do not alleviate scaling issues. Sharding would alleviate some of the issues. We are currently mostly bound by database and processing speed due to the database. Short term there are a lot of client improvements that can be accomplished to improve disk I/O, but long term things like sharding will be necessary. The Eth Research site has a lot of interesting threads about sharding including merkle tree formats to be used and ideas around asynchronous accumulators

[1:09:57] Decision process for EIPs?

Needs to be improved. Hudson and others will work on updating EIP #1 and other improvements in Q1. Nick Savers has been added as an EIP editor. Yoichi has been added as an editor. Both are doing a great job.

Attendance

Alex Beregszaszi (EWASM/Solidity/ethereumJS), Alex Van de Sande (Mist/Ethereum Wallet), Alexey Akhunov (Turbo Geth), Ben Edgington (Consensys/Pegasys), Casey Detrio (Volunteer), Christian Reitwiessner (cpp-ethereum/Solidity), Daniel Ellison (Consensys/LLL), Greg Colvin (EVM), Hudson Jameson (Ethereum Foundation), Hugo de la Cruz (ethereumJS/EWASM), Jake Lang (EWASM), Jared Wasinger (ethereumJS/EWASM), Martin Becze (EWASM), Mikhail Kalinin (Harmony), Paweł Bylica (cpp-ethereum/EWASM), Péter Szilágyi (geth), Silur (ethereumJS / EWASM)
submitted by Souptacular to ethereum [link] [comments]

My conception of the ideal functional programming database

There is nothing more annoying than databases. Every DB nowadays - relational or not - is based on some kind of pre-determined data structure (tables, documents, key/val stores, whatever) plus some methods to mutate their data. They're the functional programmer's worst nightmare and one of the few "imperative" things that still impregnate Haskell programs. I wonder if there isn't, on this human world, a single functional-oriented DB.
I'm thinking of an app-centric, append-only-log database. That is, rather than having tables or documents with operations that mutate the database state - like all DBs nowadays do, and which is completely non-functional - it would merely store an immutable history of transactions. You would then derive the app state from a reducer. Let me explain with an example. Suppose we're programming a collective TODO-list application. In order to create a DB, all you need is the specification of your app and a data path:

Local database

import MyDreamDB data Action = NewTask { user :: String, task :: String, deadline :: Date } deriving Serialize data State = State [String] deriving Serialize todoApp :: App todoApp = App { init = State [], next = \ (NewTask user task deadline) tasks -> (user ++ " must do " ++ task ++ " before " ++ show deadline ++ ".") : tasks} app <- localDB "./todos" todoApp :: App Action State 
If the DB isn't created, it creates it. Otherwise, it uses the existing info. And... that is it! app now contains an object that works exactly like a Haskell value. Of course, the whole DB isn't loaded in memory; whether it is on memory or disk, that is up to the DB engine.

Insert / remove

You insert/remove data by merely appending transactions.
append db $ NewTask "SrPeixinho" "Post my dream DB on /haskell" append db $ NewTask "SrPeixinho" "Shave my beard" append db $ NewTask "SrPeixinho" "Buy that gift" 
Those will append new items to the list of tasks because it is defined like so, but they could remove, patch, or do anything you want with the DB state.

Queries

Just use plain Haskell. For example, suppose that you want to get all tasks containing the word post:
postTasks = filter (elem "post" . words) app 
And that is it.

Migrations

If only State changes, you need to do nothing. For example, suppose you store tasks as a tuple (user, task, deadline) instead of a description, as I did previously. Then, go ahead and change State and next:
data State = State [(String, String, Date)] next = \ (NewTask user task deadline) -> (user, task, deadline) 
The next time you load the DB, the engine notices the change and automagically re-computes the final state based on the log of transactions.
If Action changes - for example, you decide to store deadline as integers - you just map the old transaction type to the new one.
main = do migrate "./todos" $ \ (NewTask user task deadline) -> (NewTask user task (toInteger deadline)) 

Indexing

Suppose you're too often querying the amount of tasks of a given user, and that became a bottleneck. To index it, you just update State and next to include the index structure explicitly.
data State = State { tasks :: [String], userTaskCount :: Map String Int} next (NewTask user task deadline) (State tasks count) = State tasks' count' where tasks' = (user, task, deadline) : tasks count' = updateWithDefault 0 (+ 1) user count 
Like with migrations, DB realizes the change and updates the final state. Then you can get the count of any user in O(1):
lookup "SrPeixinho" . userTaskCount $ todos 
Any arbitrary indexing could be performed that way. No DBs, no queries. So easy!

Replication, communication, online Apps

There is one thing more annoying than databases. Communication. Sockets, APIs, HTTP. All of those are required by nowadays real-time applications and are all a pain in the ass. Suppose I gave you the task of making a real-time online site for our Todo app. How would you do it? Probably, create a RESTful API with tons methods, then a front-end application in JavaScript/React, then make Ajax requests to pool the tasks, then a new websocket api because the poolinng was too slow and... STOP! You clearly live in the past. With MyDreamDB, this is what you would do:
main = do app <- globalDB "./todos" todoApp :: App Action State renderApp $ "
" ++ show app ++ "
" $ ghcjs myApp.hs -o myApp.html $ swarm up myApp.html $ chrome "bzz:/hash_of_my_app"
See it? By changing one word - from localDB to globalDB - app is online, connected to a network of processes distributed through the whole internet, running the same app, all synchronized with the App's state. Moreover, by adding another line - a State -> HTML call - I gave a view to our app. Then I compiled that file to HTML, hosted it in a decentralized storage (swarm), and opened it on Chrome. What you see on the screen is a real-time TODO-list of countless people in the world. Yes!
No, no, wait - you didn't even provide an IP or anything. How would the DB know how to find processes running the same App?
It hashes the specification of your APP, contacts a select number of IPs to find other processes running it and then joins a network of nodes running that app.
But if the DB is public, anyone can join my DB, so they will be able to destroy my data.
No, this is an append-only database. Forgot? No information is ever destroed.
What about spam? If anyone can join, what is stopping someone from sending tons of transactions and bloating the app's DB?
Before broadcasting a transaction, the DB creates a small proof-of-work of it - basically, a sufficiently small hash of the App code. Other nodes only accept transactions with enough PoW. This takes time to compute, so you essentially create a "portable" anti-spam measure for a distributed network that replaces the need for fees and an integrated currency.
OK, but if anyone is able to submit any transaction, he is still able to do anything with the app's state.
No; people are only able to do what is encoded on next.
But what about logins, accounts, passwords? If all my app's info is public, anyone can see everyone else's password.
Use digital signatures.
OK, but every info is still public. Some applications simply require private info.
Use encryption.
Someone with tons of CPU power is still able to DDOS my app.
Yes.
Is it efficient enough?
Each application would work as a specific-purpose blockchain, which are often perfectly usable for their specific applications.
So you're telling me that, with MyDreamDB, you could recreate Bitcoin in a bunch of lines of code?
Yes:
import MyDreamDB type Address = String data State = State { lastHash :: String, balance :: Map Address Balance} data Action = Mine { to :: Address, nonce :: String } | Send { sig :: Signature, to :: Address, amount :: Integer } bittycoinApp :: App bittycoinApp = App { init = State empty, next = next} where -- "Mining" here is merely a mean of limiting emission, -- it is not necessary for the operation of the network. -- Different strategies could be used. next (Mine to hash) (State lastHash balance) | sha256 (lastHash++hash) < X = -- Send money to someone next [email protected](Send sig to amount) [email protected](State lastHash balance) | not $ ecVerify sig (show tx) = st -- Signature doesn't match | lookup address balance < amount = st -- Not enough funds | otherwise = State lastHash balance' -- Tx successful where from = ecRecover sig -- the transaction sender balance' = update from (- amount) . update to (+ amuont) $ balance main = do onlineDB "./data" bittycoinApp :: App State Action 
Compile and run something like that and you have a perfectly functioning full-node of a digital currency with properties very similar to Bitcoin. Anyone running the same code would connect to the same network. Of course, it might be improved with adjustable difficulty and many other things. But the hardest "blockchain" aspects - decentralization, transactions, consensus, gossip protocols - that all could and should be part of the decentralized implementation of MyDreamDB.
Your todo-app front-end is just a string, it isn't interactive.
Just call append myTx myApp on HTML events - that will broadcast the transaction globally.
What about local state? Tabs, etc.
Use a localDB where you would use Redux, use append myAction localApp where you would use dispatch. Use React as usual.

Conclusion

That is, honestly, the project I think I lack the most. Is there anything like it?
submitted by SrPeixinho to haskell [link] [comments]

[For newbies]You’d Better Know 40 Jargons in Cryptocurrency World.

Many newbies may feel strange or even confused about various jargons when we step into cryptocurrency world for the first time. I read lots of information on the Internet and combined my understanding to sort out the 40 jargons and some useful questions that are common while mining. I will divide these into several parts. If there is something wrong in my description, please point it out directly, thank you very much!

1.Digital Currency
A digital currency is a form of currency that is available only in digital or electronic form, and not in physical form. It is also called digital money, electronic money, electronic currency, or cyber cash.Digital currency includes virtual currency, cryptocurrency, electronic money, and so on.

2.Cryptocurrency
A cryptocurrency is a digital or virtual currency that uses cryptography for security. A cryptocurrency is difficult to counterfeit because of this security feature. Many cryptocurrencies are decentralized systems based on blockchain technology, a distributed ledger enforced by a disparate network of computers. A defining feature of a cryptocurrency, and arguably its biggest allure, is its organic nature; it is not issued by any central authority, rendering it theoretically immune to government interference or manipulation.There are currently well over one thousand different cryptocurrencies in the world and many people see them as the lynchpin of a fairer, future economy.Countries have different definitions of cryptocurrencies, such as property, commodities, currency, virtual currency, etc.

3.Token
Tokens are different from bitcoins and altcoins in that they are not mined by their owners nor primarily meant to be traded (although they may be traded on exchanges if the company that issued them becomes valuable enough in the eyes of the public), but to be sold for fiat or cryptocurrency in order to fund the start-up's tech project.Moreover, the amount of token allocation is often determined in advance, such as how much of the token is allocated to the developer and how much is used for operations.

4.AltCoin
An altcoin is any digital cryptocurrency similar to Bitcoin. The term is said to stand for “alternative to Bitcoin” and is used describe any cryptocurrency that is not a Bitcoin. Altcoins are created by diverging from Bitcoin consensus rules (the fundamental rules of the cryptocurrency’s network) or by developing a new cryptocurrency from scratch.

5、Blockchain
A type of distributed digital ledger to which data is recorded sequentially and permanently in ’blocks’. Each new block is linked to the immediately previous block with a cryptographic signature, forming a ‘chain’. This tamper-proof selfvalidation of the data allows transactions to be processed and recorded to the chain without recourse to a third party certification agent. The ledger is not hosted in one location or managed by a single owner, but is shared and accessed by anyone with the appropriate permissions – hence ‘distributed’.Each of the computers in the distributed network maintains a copy of the ledger to prevent a single point of failure (SPOF) and all copies are updated and validated simultaneously.

6、Block
A package of data containing multiple transactions over a given period of time. A block is a record set of some or all of the latest bitcoin transactions and is not recorded by other previous blocks.

7. Block Header
A block header is used to identify a particular block on an entire blockchain and is hashed repeatedly to create proof of work for mining rewards.The head of the block is divided into six components:the version number of the software,the hash of the previous block( the hash of the previous block is contained in the hash of the new block, the blocks of the blockchain all build on each other),he root hash of the Merkle tree,the time in seconds since 1970–01–01 T00: 00 UTC,the goal of the current difficulty(The lower the goal in bits is, the harder it is to find a matching hash),the nonce(The nonce is the variable incremented by the proof of work. In this way, the miner guesses a valid hash, a hash that is smaller than the target.).As a part of a standard mining exercise, a block header is hashed repeatedly by miners by altering the nonce value. Through this exercise, they attempt to create proof of work, which helps miners get rewarded for their contributions to keep the blockchain system running.

8.Hashing
Hashing is the result of applying an algorithmic function to data in order to convert them into a random string of numbers and letters. This acts as a digital fingerprint of that data, allowing it to be locked in place within the blockchain.

9.Enesis Block
The genesis block is the first block in any blockchain-based protocol. It is the foundation on which additional blocks are sequentially added to form a chain of blocks, resulting in the term, blockchain being coined.The genesis block is also referred to as block zero. The second block to be added on top of block zero would then be referred to as block number one.

10. Block Height
The number used to refer to the ordering of blocks is known as the block height number. A blockchain contains a series of blocks, hence the block height number is always a positive integer greater than zero.

In the next few days,we will continue to post posts about jargons and some useful questions that are common while mining, please continue to follow our posts.
submitted by hashaltcoin to u/hashaltcoin [link] [comments]

ECOCRYPTO

ECOCRYPTO
ECOCRYPTO
FOR GREEN CRYPTOCURRENCY MINING
FUTURE OF CRYPTOCURRENCY
DEPENDS ON ECOLOGICAL MINING
"CRYPTOCURRENCY DEPENDS ON ECOLOGICAL MINING"
Donate BTC to support awareness enquiry:
1EaSG3WmY5fRXedhy9tbbJK3tGftKp4sAZ
Sourcece: https://cryptobriefing.com/green-crypto-mining-38bn-future/
· Home
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· Green Crypto Mining Will Define The Industry’s $38bn Future
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ANALYSIS

Green Crypto Mining Will Define The Industry’s $38bn Future

Energy usage will drop by design thanks to these critical industry developments.

📷By Nick Hall On Aug 10, 2018
1,779
1
In March this year, the sky officially fell in for Bitcoin miners. With the slump in prices and the extraordinary energy consumption it takes to mine the coins, Fortune revealed that mining a Bitcoin cost as much as buying one. Green crypto mining wasn’t even on the radar for most people until earlier this year.
That was back in March and they were the good times. Morgan Stanley revealed in April that Bitcoin miners would lose money if Bitcoin slipped below $8,600, even with low electricity figures factored in.
A recent study by Coinshare showed that the numbers attributed to the Bitcoin mining industry have been grossly exaggerated and the energy consumption is approximately 50% of the claimed 70TWh. But the numbers are still too high in terms of the financial outlay and the environmental impact of mining cryptocurrency.
Mining doesn’t begin and end with Bitcoin – and although the consensus is (mostly) set in stone, the way we create the energy needed to extract the next part of the puzzle isn’t. Which is why green crypto mining is the ONLY solution to the diminishing returns issue: more cost, for less reward, will eventually lead to an abandonment of the mine, just as it did for gold miners in California in 1848-49.
We’re not looking for one single solution either. We need four separate ones:
  1. A lighter consensus algorithm
  2. Cloud-based cryptocurrency mining.
  3. Renewable, cheaper energy sources to support physical ‘mines’.
  4. Brutal consolidation in the mining industry.

What is cryptocurrency mining?

The Proof-of-Work (PoW) protocol was popularized by shadowy Bitcoin founder Satoshi Nakamoto, building on earlier work by a variety of computer scientists including Hal Finney, and it’s a two-stage process to validate transactions and keep a flow of Bitcoins entering the market. Blocks of data are parsed off and, with Bitcoin, they contain about 1MB. Each block is then locked and coded.
Miners then compete to solve the puzzle and provide the 64-digit hexadecimal key code that it then has to match with a corresponding ‘nonce’, numbers used only once, to claim the reward for unlocking the block and mine Bitcoins. There’s a small fee for validating the transactions, but the Bitcoin miners are really like the old gold miners and they’re after the big paydays.

Why is Bitcoin mining expensive?

In the old days, Bitcoin mining was easy. Back in 2009, a standard desktop computer could mine up to 200 Bitcoin a day. But speed is everything and Bitcoin mining turned into an arms race as Bitcoin soared and the well-funded miners went to war.
Companies like Bitmain, Bitfury and Vogogo spotted a gap in the market and brought professionalism to the Bitcoin mining industry. The Wild West days fell by the wayside and suddenly a standard computer chip would take 98 years to mine one coin, as the super fast rigs of the new breed simply stomped the casual miner into the dust.
The cryptocurrency mining industry even caused the great computer graphics card drought of 2017-2018 as demand for GPUs literally outstripped supply. Used cards were even selling above sticker price and the shelves in-store were stripped bare, but the big guns were already spending tens of millions of dollars to put these home brew operations out of business.
These aren’t computers anymore, they are mission control centers and the power it takes to keep them running is a serious issue for the company’s bottom line and the environmental lobby.
So the industry is looking for a number of different green crypto mining solutions, that will gel together in some haphazard way to form the future of the cryptocurrency market.
The main obstacles are:

1. A greener algorithm

It may be hard to visualize the blockchain itself, but we don’t need to. Technology almost always gets lighter, smaller and slimmer. The same needs to happen to block production.
Blockchain is middleware and it needs to be slimmed down, without sacrificing security or functionality. That’s an ongoing evolutionary process, as it was with smartphones, and the blockchain we’re using in 20 years will likely have little in common with today’s code.
Proof-of-Stake consensus algorithms have been pitched as one way of reducing crypto’s carbon footprint. Instead of competing for block rewards, producers would take turns, weighted by the size of their stake in the network.
Staking is unlikely to catch on in the Bitcoin community, but it has many supporters with Ethereum as well as other cryptocurrencies.. That would make the whole validation process more efficient and cheap.

2. Cloud-based cryptocurrency mining

There are mining firms that are still investing millions of dollars in physical equipment and taking on all the sunk costs, when the Cloud is simply taking over the world of advanced computing.
Cloud-based cryptocurrency mining companies are already selling packages to the general public and the Cloud offers increased security, speed and essentially a small slice of the world’s computing power, rather than the machines you buy, install and power up. It also potentially offers AI integration that could leave the traditional cryptocurrency miners hopelessly panning for gold in a dead river.
The Cloud has made self-driving cars and robots a reality. It can certainly ramp up the speed of calculations and leave even a multi-million dollar mining rig trailing in its wake.
The switch to Cloud-based mining is good news for the environment, too, as the power demands would move to localities with the cheapest energy. Without these wild spikes in energy consumption and without these concentrated mines, the main complaints about the industry will simply cease to be an issue.

3. Renewable, cheap energy for grand-scale mines

Cloud-based cryptocurrency mining looks like the obvious solution, but it’s the final cost that determines the methodology when it comes to crypto mining and there is more than one way to do this.
Technically, the likes of Elon Musk could turn the arid sub-Saharan scrubland into the biggest and most prosperous cryptocurrency mine in the world with a vast array of solar panels and Tesla PowerPack batteries to keep it running through the night.
Cheap land and free energy means that hardware would be the only major cost to consider in this instance. Alternatively, a State-sponsored mining firm in a smaller nation could easily co-opt hydroelectric or solar providers to work with them to reduce energy costs. Even the ones that use grid power can select the world’s cheapest nations and bulk buy energy in blocks.
Potentially, then, we could still have the grand-scale mines that bring economy of scale and environmentally-friendly energy production to the world of cryptocurrency mining.

4. Brutal consolidation

It does not matter how the industry develops, or if Cloud computing or giant mines are the future, the days of the home cryptocurrency miner are numbered.
Just like the mom and pop mines of the goldrush days gave way to corporate giants with drilling and excavation machinery that made the old pick and shovel look slightly ridiculous, the same will happen in cryptocurrency mining.
Competition will continue to grow, the margins will likely drop even further and the flagrant energy use of today’s cryptocurrency miners simply won’t be an option. Miners that don’t streamline their operations and adopt some form of green crypto mining process will simply run at a loss until they go out of business.
Bil Tai is the Chairman of Hul 8, the North American arm of Bitfury Group and one of the biggest suppliers of cryptocurrency mining equipment of the world. Even he expects just 5-10 giant mining companies to survive the impending cull.
“It’s totally different this year,” he told Bloomberg. “The bitcoin mining industry was this mysterious, dark, cottage industry. It’s about to grow up and scale institutionally.”
There’s a dark side to these tech giants emerging, as they will technically have the power to exert an influence on a coin’s value, not just its creation. That is a problem the industry will have to examine at some point. This simple danger, though, is not enough to turn back the tide of progress.
So, we can expect to see a handful of mining companies dominate the industry as they make the best use of the available technology.

Conclusion: Green Crypto Mining Isn’t An Option: It’s The Only Option

One way or another, the environmental issues that dog the cryptocurrency mining industry are set to disappear.
It will be the free market that drives down that energy usage, rather than regulations and sanctions. The days of the home crypto miner are simply coming to an end, though, as the industry matures and large companies descend and fight for dominance in what could become a $38 billion a year industry by 2025.
That comes with its own set of tradeoffs, especially for philosophical hardliners. Like it or not, a leaner, greener cryptocurrency mining process is just around the corner, and big business is going to create it.
ECOCRYPTO
FOR GREEN CRYPTOCURRENCY MINING
FUTURE OF CRYPTOCURRENCY
DEPENDS ON ECOLOGICAL MINING
"CRYPTOCURRENCY DEPENDS ON ECOLOGICAL MINING"
Donate BTC to support awareness enquiry:
1EaSG3WmY5fRXedhy9tbbJK3tGftKp4sAZ
submitted by yakutami01 to btcgreen [link] [comments]

Non-Contentious Alternative to A Fork: Symbiosis Instead Of Quarrel: One-Way-Peg Sidechain: Good For "Small-Blockers" As Well As "Pragmatics"! The Best From Both Philosophies: Conservatism For Bitcoin-Core, Unleashing Full On-Chain Utility Of Bitcoin Unlimited. All Groups Mutually Benefit.

Sorry for the long post - but I think it should really be read and understood by everybody concerned with the idea of launching a "Higher-Capacity Bitcoin", by everybody concerned with Bitcoin security and decentralization, and by everybody concerned with Bitcoin price!
Description Of The Concept:
Consequences Of This Solution - Characteristics:
  1. Every user who owns BTC-c can directly "convert" it 1:1 to BTC-u by a simple transfer to unspendable address "1transferAddressToBitcoinUsab1eGh5W".
  2. Optionally, the user could of course "convert it" via a classical exchange market, if the exchange market allows trade in BTC-c and BTC-u.
  3. Every User who owns BTC-u can only convert it (back) to BTC-c via a normal crypto-currency exchange market (because we have a ONE way peg without any modifications of the Bitcoin-core protocol, we cannot do it on protocol level!). While this is not a big difference microscopically from individual user perspective (if exchanges are well-integrated in apps and exchange fees are low), it does make a difference macro-economically, because BTCs can only drain in one direction, long-term, and never back.
Some Thoughts On Market Dynamics To Be Expected:
(I assume that the following "phases" will span over MANY years)
Thoughts On Exchange Rate Evolutions To Be Expected:
  • Phase 1:
    • A BTC-u unit is expected to be valued less than BTC-c, because you cannot really do anything meaningful with BTC-u yet, and after all, each owner of BTC-c can exchange it for a unit of BTC-u 1:1, so there is no reason why the free markets should give BTC-u a higher valuation than a BTC-c! If this were the case traders would immediately exchange BTC-c for BTC-u on protocol level and take the arbitrage gains. So market forces alone will keep the price of BTC-u below the price of BTC-c, except for very short periods of time (which will probably not occur at all in this "phase 1").
    • Only some tech geeks and early adopters will hence exchange some BTC-c for BTC-u, more for idealistic reasons or for "trying things out" than for trading and financial reasons.
  • Phase 2:
    • BTC-u's advantage in terms of practical utility vs. BTC-c becomes more and more apparent, such that BTC-u price gets closer and closer to BTC-c price on the markets.
    • As BTC-c hodlers keep on standing by their BTC-c, the number of BTC-u in circulation remains low! Users who want to make use of BTC-u's new utility (high TX capacity) have to aquire BTC-u either via protocol-level exchange (destroy BTC-c to get BTC-u), or via the exchanges - whatever is more convenient and attractive. Since BTC-u is still valued lower than BTC-c, they would make the better deal by going via the exchanges (as long as the [small] exchange market fee is less than the difference between BTC-c and BTC-u exchange rate, which can be expected to be the case for quite a while)! This would keep BTC-u supply low and hence it would keep BTC-u price high. And of course, since price(BTC-c) >= price(BTC-u) due to the one-way peg, BTC-c price benefits equally from this!
  • Phase 3:
    • If BTC-u fails for technical or other reasons, its price collapses and the whole experiment becomes history. The number of BTC-c spendable has been reduced due to this experiment, so each BTC-c unit becomes more rare and hence more valuable in price.
    • Otherwise, the demand for BTC-u from practical usage gets even higher, while the total number of BTC-u units in existence are pretty limited. This puts enormous upwards price pressure to BTC-u, and thereby also to BTC-c, to lift up BTC valuation, such that all BTC-u real-world usages can be fulfilled. BTC-c and BTC-u prices are very close, and at certain times of very high demand for BTC-u it even happens that BTC-u is valued higher than BTC-c on some exchanges. When this happens, arbitrage traders will kick in and buy the currently cheaper BTC-c, convert them to higher valued BTC-u by protocol means, and cell the more expensive BTC-u on the market. So such situations won't endure very long and will only serve market pressures in case of severe shortages of BTC-u coins.
DIFFerences and ADVantages Of This Strategy Vs. A "Normal Fork":
  • Both in common: No Dillution or Inflation:
    • In case of a normal fork, the total number of Bitcoins will double from 21 Million to 42 Million, because both forked chains will eventually have 21 Million, respectively. This inflation of Bitcoins is compensated by the fact that each pre-fork Bitcoin owner will also double his owned Bitcoin, so there should be no net penalty by principle.
    • In contrast, with "Bitcoin-Usable", the total(!) number of spendable Bitcoins will never be higher than 21 Million, counting BTC-c and BTC-u together.
    • Hence, even if it looks different in nominal coin units, the net effect is the same: No coins are inflated or diluted and every owner of bitcoins keeps his/her stake, nobody is at a disadvantage.
  • Symbiosis instead of Competition:
    • With "Bitcoin-Usable", bitcoin-core price will fully benefit from the success of the "Bitcoin-Unlimited" or "bigger blocksize" approach of "Bitcoin-Usable". This means that Bitcoin-core hodlers have full self-interest that "Bitcoin-Usable" becomes a success!
    • This is in stark contrast to the "fork" scenario, where the two forks will be competitors and may continue propagating their different philosophies on the different media channels. This not always friendly atmosphere and way of discussion may harm both sides! In the "Bitcoin-Usable" solution instead, both sides can still propagate their own views positively, without any need to talk negatively about the other side, because there is no competition but on the contrary mutual benefit!
    • Hence there would be no incentive from Bitcoin-Core supporters to DoS the "competing" bigger-block-chain - on the contrary they have an interest for that chain to succeed.
  • All fully validating "Bitcoin-Usable" nodes are also fully validating "Bitcoin-core" nodes (but not vice versa). Hence the number of bitcoin-core nodes can only increase compared to today in case "Bitcoin-Usable" becomes a big success, thereby also making the Bitcoin-core network more stable and powerful. So Bitcoin-Core benefits from "Bitcoin-Usable" not only w.r.t. price, but also w.r.t. security! (apart from that, price rise alone has a positive effect on security [via hash power] on its own already)
  • Since Bitcoin-Usable's block sizes and blockchain size are expected to become significantly greater than that of bitcoin-core on the long term, the additional burden that "Bitcoin-Usable" has by also having to observe the Bitcoin-Core blockchain is rather negligible, so in this respect there is no relevant difference between the two solutions.
  • As explained above, the mechanism of the one-way-peg in combination with the market mechanisms on price (low supply of BTC-u vs. high demand as a utility, and the constraint price(BTC-c) >= price(BTC-u)) creates a strong up-force of the Bitcoin price (for both bitcoins), originated by the additional applications of "Bitcoin-Usable". Again, BTC-c fully benefits from this.
  • No replay attack is possible even for identical TX formats in the protocol, because "Bitcoin-Usable" does not share Bitcoin-Core's blockchain history. Hence even better code re-use is possible - the only differences being block size limit and address format (first digit 2/4 vs. 1/3) and the lack of a block reward. And of course the observation of the "other" blockchain and the coin generation after coin destruction (one way peg implementation).
submitted by 1MichaS1 to btcfork [link] [comments]

Is Seccure vulnerable to Nonce Reuse private key recovery attacks?

A script was just released for finding Bitcoin private keys that have signed two or more messages with the same nonce:
https://github.com/tintinweb/ecdsa-private-key-recovery
I was wondering if Seccure, which also uses ECDSA is vulnerable to the same attack?
My concern is with this code snippet:
#define ECDSA_DETERMINISTIC 1 ... #if ECDSA_DETERMINISTIC k = ecdsa_cprng_get_exponent(cprng, cp); #else k = get_random_exponent(cp); #endif 
Tbh I'm not very familiar with crypto, but the code looks like it's not using a random number for k.
submitted by tc655 to crypto [link] [comments]

Great interview questions for bitcoin engineers

From here...
https://bitcointalk.org/index.php?topic=5006583.0
Questions. Chapter 1: Introduction 1. What are the main Bitcoin terms? 2. What is a Bitcoin address? 3. What is a Bitcoin transaction? 4. What is a Bitcoin block? 5. What is a Bitcoin blockchain? 6. What is a Bitcoin transaction ledger? 7. What is a Bitcoin system? What is a bitcoin (cryptocurrency)? How are they different? 8. What is a full Bitcoin stack? 9. What are two types of issues that digital money have to address? 10. What is a “double-spend” problem? 11. What is a distributed computing problem? What is the other name of this problem? 12. What is an election? 13. What is a consensus? 14. What is the name of the main algorithm that brings the bitcoin network to the consensus? 15. What are the different types of bitcoin clients? What is the difference between these clients? Which client offers the most flexibility? Which client offers the least flexibility? Which client is the most and least secure? 16. What is a bitcoin wallet? 17. What is a confirmed transaction and what is an unconfirmed transaction? Chapter 2: How Bitcoin works. 1. What is the best way to understand transactions in the Bitcoin network? 2. What is a transaction? What does it contain? What is the similarity of a transaction to a double entry ledger? What does input correspond to? What does output correspond to? 3. What are the typical transactions in the bitcoin network? Could you please name three of such transactions and give examples of each type of the transaction? 4. What is a QR and how it is used in the Bitcoin network? Are there different types of QRs? If so, what are the different types? Which type is more informational? What kind of information does it provide? 5. What is SPV? What does this procedure check and what type of clients of the Bitcoin network usually use this procedure? Chapter 3: The Bitcoin client. 1. How to download and install the Core Bitcoin client? 2. What is the best way to test the API available for the Core Bitcoin client without actually programming? What is the interface called? 3. What are the major areas of operations in the Bitcoin client? What can we do with the client? 4. What are the available operations for the Bitcoin addresses? 5. What are the available read operations for the Bitcoin transactions? How is a transaction encoded in the Bitcoin network? What is a raw transaction and what is a decoded transaction? 6. If I want to get information about a transaction that is not related to any address in my own wallet, do I need to change anything in the Bitcoin client configuration? If yes, which option do I need to modify? 7. What are the available read operation for the Bitcoin blocks? 8. What are the available operations for the creation of the transactions in the Bitcoin network? 9. How do you normally need to address the unspent output from the previous transaction in order to use it as an input for a new transaction? 10. What is the mandatory operation after creating a new transaction and before sending this new transaction to the network? What state does the wallet have to be in order to perform this operation? 11. Is the transaction ID immutable (TXID)? If not why, if yes, why and when? 12. What does signing a transaction mean? 13. What are the other options for Bitcoin clients? Are there any libraries that are written for some specific languages? What types of clients do these libraries implement? Chapter 4: Keys, Addresses and Wallets. 1. What is a PKC? When it was developed? What are the main mathematical foundations or functions that PKC is using? 2. What is ECC? Could you please provide the formula of the EC? What is the p and what is the Fp? What are the defined operations in ECC? What is a “point to infinity”? 3. What is a Bitcoin wallet? Does this wallet contain coins? If not, what does it contain then? 4. What is a BIP? What it is used for? 5. What is an encrypted private key? Why would we want to encrypt private keys? 6. What is a paper wallet? What kind of storage it is an example of? 7. What is a nondeterministic wallet? Is it a good wallet or a bad wallet? Could you justify? 8. What is a deterministic wallet? 9. What is an HD wallet? 10. How many keys are needed for one in and out transaction? What is a key pair? Which keys are in the key pair? 11. How many keys are stored in a wallet? 12. How does a public key gets created in Bitcoin? What is a “generator point”? 13. Could you please show on a picture how ECC multiplication is done? 14. How does a private key gets created in Bitcoin? What we should be aware of when creating a new private key? What is CSPRNG? What kind of input should this function be getting? 15. What is a WIF? What is WIF-Compressed? 16. What is Base58 encoding and what is Base58Check encoding? How it is different from Base64 encoding? Which characters are used in Base58? Why Base58Check was invented? What kind of problems does it solve? How is Base58Check encoding is created from Base58 encoding? 17. How can Bitcoin addresses be encoded? Which different encodings are used? Which key is used for the address creation? How is the address created? How this key is used and what is the used formula? 18. Can we visually distinguish between different keys in Base58Check format? If yes, how are they different from each other? What kind of prefixes are used? Could you please provide information about used prefixes for each type of the key? 19. What is an index in HD wallets? How many siblings can exist for a parent in an HD wallet? 20. What is the depth limitation for an HD wallet key hierarchy? 21. What are the main two advantages of an HD wallet comparing to the nondeterministic wallets? 22. What are the risks of non-hardened keys creation in an HD wallet? Could you please describe each of them? 23. What is a chain code in HD wallets? How many different chain code types there are? 24. What is the mnemonic code words? What are they used for? 25. What is a seed in an HD wallet? Is there any other name for it? 26. What is an extended key? How long is it and which parts does it consist of? 27. What is P2SH address? What function are P2SH addresses normally used for? Is that correct to call P2SH address a multi-sig address? Which BIP suggested using P2SH addresses? 28. What is a WIF-compressed private key? Is there such a thing as a compressed private key? Is there such a thing as a compressed public key? 29. What is a vanity address? 30. What is a vanity pool? 31. What is a P2PKH address? What is the prefix for the P2PKH address? 32. How does the owner prove that he is the real owner of some address? What does he have to represent to the network to prove the ownership? Why a perpetrator cannot copy this information and reuse it in the next transactions? 33. What is the rule for using funds that are secured by a cold storage wallet? How many times you can send to the address that is protected by the private key stored in a cold storage? How many times can you send funds from the address that is protected by the private key stored in a cold storage? Chapter 5: Transactions. 1. What is a transaction in Bitcoin? Why is it the most important operation in the Bitcoin ecosystem? 2. What is UTXO? What is one of the important rules of the UTXO? 3. Which language is used to write scripts in Bitcoin ecosystem? What are the features of this language? Which language does it look like? What are the limitations of this language? 4. What is the structure of a transaction? What does transaction consists of? 5. What are the standard transactions in Bitcoin? How many standard transactions there are (as of 2014)? 6. What is a “locking script” and what is an “unlocking script”? What is inside these scripts for a usual operation of P2PKH? What is a signature? Could you please describe in details how locking and unlocking scripts work and draw the necessary diagrams? 7. What is a transaction fee? What does the transaction fee depend on? 8. If you are manually creating transactions, what should you be very careful about? 9. Could you please provide a real life scenario when you might need a P2SH payment and operation? 10. What is the Script operation that is used to store in the blockchain some important data? Is it a good practice? Explain your answer. Chapter 6: The Bitcoin Network. 1. What is the network used in Bitcoin? What is it called? What is the abbreviation? What is the difference between this network architecture and the other network architectures? Could you please describe another network architecture and compare the Bitcoin network and the other network architectures? 2. What is a Bitcoin network? What is an extended Bitcoin network? What is the difference between those two networks? What are the other protocols used in the extended Bitcoin network? Why are these new protocols used? Can you give an example of one such protocol? What is it called? 3. What are the main functions of a bitcoin node? How many of them there are? Could you please name and describe each of them? Which functions are mandatory? 4. What is a full node in the Bitcoin network? What does it do and how does it differ from the other nodes? 5. What is a lightweight node in the Bitcoin network? What is another name of the lightweight node? How lightweight node checks transactions? 6. What are the main problems in the SPV process? What does SPV stand for? How does SPV work and what does it rely on? 7. What is a Sybil attack? 8. What is a transaction pool? Where are transaction pools stored in a Bitcoin network client? What are the two different transaction pools usually available in implementations? 9. What is the main Bitcoin client used in the network? What is the official name of the client and what is an unofficial name of this client? 10. What is UTXO pool? Do all clients keep this pool? Where is it stored? How does it differ from the transaction pools? 11. What is a Bloom filter? Why are Bloom filters used in the Bitcoin network? Were they originally used in the initial SW or were they introduced with a specific BIP? Chapter 7: The Blockchain. 1. What is a blockchain? 2. What is a block hash? Is it really a block hash or is it a hash of something else? 3. What is included in the block? What kind of information? 4. How many parents can one block have? 5. How many children can one block have? Is it a temporary or permanent state of the blockchain? What is the name of this state of the blockchain? 6. What is a Merkle tree? Why does Bitcoin network use Merkle trees? What is the advantage of using Merkle trees? What is the other name of the Merkle tree? What kind of form must this tree have? 7. How are blocks identified in the blockchain? What are the two commonly used identities? Are these identities stored in the blockchain? 8. What is the average size of one transaction? How many transactions are normally in one block? What is the size of a block header? 9. What kind of information do SPV nodes download? How much space do they save by that comparing to what they would need if they had to download the whole blockchain? 10. What is a usual representation of a blockchain? 11. What is a genesis block? Do clients download this block and if yes – where from? What is the number of the genesis block? 12. What is a Merkle root? What is a Merkle path? Chapter 8: Mining and Consensus. 1. What is the main purpose of mining? Is it to get the new coins for the miners? Alternatively, it is something else? Is mining the right or good term to describe the process? 2. What is PoW algorithm? 3. What are the two main incentives for miners to participate in the Bitcoin network? What is the current main incentive and will it be changed in the future? 4. Is the money supply in the Bitcoin network diminishing? If so, what is the diminishing rate? What was the original Bitcoin supply rate and how is it changed over time? Is the diminishing rate time related or rather block related? 5. What is the maximum number of Bitcoins available in the network after all the Bitcoins have been mined? When will all the Bitcoins be mined? 6. What is a decentralized consensus? What is a usual setup to clear transactions? What does a clearinghouse do? 7. What is deflationary money? Are they good or bad usually? What is the bad example of deflationary spiral? 8. What is an emergent consensus? What is the feature of emergent consensus? How does it differ from a usual consensus? What are the main processes out of which this emergent decentralized consensus becomes true? 9. Could you please describe the process of Independent Transaction Verification? What is the list of criteria that are checked against a newly received transaction? Where can these rules be checked? Can they be changed over time? If yes, why would they be changed? 10. Does mining node have to be a full node? If not, what are the other options for a node that is not full to be a mining node? 11. What is a candidate block? What types of nodes in the Bitcoin network create candidate blocks? What is a memory pool? Is there any other name of the memory pool? What are the transactions kept in this memory pool? 12. How are transactions added to the candidate block? How does a candidate block become a valid block? 13. What is the minimum value in the Bitcoin network? What is it called and what is the value? Are there any alternative names? 14. What is the age of the UTXO? 15. How is the priority of a transaction is calculated? What is the exact formula? What are the units of each contributing member? When is a transaction considered to be old? Can low priority transactions carry a zero fee? Will they be processed in this case? 16. How much size in each block is reserved for high priority transactions? How are transactions prioritized for the remaining space? 17. Do transactions expire in Bitcoin? Can transactions disappear in the Bitcoin network? If yes, could you please describe such scenario? 18. What is a generation transaction? Does it have another name? If it does, what is the other name of the transaction? What is the position of the generation transaction in the block? Does it have an input? Is the input usual UTXO? If not – what is the input called? How many outputs there are for the generation transaction? 19. What is the Coinbase data? What is it currently used for? 20. What is little-endian and big-endian formats? Could you please give an example of both? 21. How is the block header constructed? Which fields are calculated and added to the block header? Could you please describe the steps for calculation of the block header fields? 22. What is a mantissa-exponent encoding? How is this encoding used in the Bitcoin network? What is the difficulty target? What is the actual process of mining? What kind of mathematical calculation is executed to conduct mining? 23. Which hash function is used in the Bitcoin mining process? 24. Could you describe the PoW algorithm? What features of the hash function does it depend on? What is the other name of the hash function? What is a nonce? How can we increase the difficulty of the PoW calculation? What do we need to change and how do we need to change this parameter? 25. What is difficulty bits notation? Could you please describe in details how it works? What is the formula for the difficulty notation? 26. Why is difficulty adjustable? Who adjusts it and how exactly? Where is the adjustment made? On which node? How many blocks are taken into consideration to predict the next block issuance rate? What is the change limitation? Does the target difficulty depend on the number of transactions? 27. How is a new block propagated in the network? What kind of verification does each node do? What is the list of criteria for the new block? What kind of process ensures that the miners do not cheat? 28. How does a process of block assembly work? What are the sets of blocks each full node have? Could you please describe these sets of blocks? 29. What is a secondary chain? What does each node do to check this chain and perhaps to promote it to the primary chain? Could you please describe an example when a fork occurs and what happens? 30. How quickly forks are resolved most of the time? Within how many new block periods? 31. Why the next block is generated within 10 minutes from the previous? What is this compromise about? What do designers of the Bitcoin network thought about when implementing this rule? 32. What is a hashing race? How did Bitcoin hashing capacity has changed within years from inception? What kind of hardware devices were initially used and how did the HW utilization evolved? What kind of hardware is used now to do mining? How has the network difficulty improved? 33. What is the size of the field that stores nonce in the block header? What is the limitation and problem of the nonce? Why was an extra nonce created? Was there any intermediate solution? If yes, what was the solution? What are the limitations of the solution? 34. What is the exact solution for the extra nonce? Where does the new space come from? How much space is currently used and what is the range of the extra nonce now? 35. What is a mining pool? Why was it created? How are normally such pools operated? Do they pay regularly to the pool participants? Where are newly created Bitcoins distributed? To which address? How do mining pools make money? How do the mining pools calculate the participation? How are shares earned calculated? 36. What is a managed pool? How is the owner of the pool called? Do pool members need to run full nodes? Explain why or why not? 37. What are the most famous protocols used to coordinate pool activities? What is a block template? How is it used? 38. What is the limitation of a centralized pool? Is there any alternative? If yes, what is it? How is it called? How does it work? 39. What is a consensus attack? What is the main assumption of the Bitcoin network? What can be the targets of the consensus attacks? What can these attacks do and what they cannot do? How much overall capacity of the network do you have to control to exercise a consensus attack? Chapter 9: Alternative Chains, Currencies and Applications. 1. What is the name of alternative coins? Are they built on top of the Bitcoin network? What are examples of them? Is there any alternative approach? Could you please describe some alternatives? 2. Are there any alternatives to the PoW algorithm? If yes – what are the alternatives? Could you please name two or three? 3. What is the operation of the Script language that is used to store a metadata in Bitcoin blockchain? 4. What is a coloured coin? Could you please explain how it is created and how it works? Do you need any special SW to manage coloured coins? 5. What is the difference between alt coins and alt chains? What is a Litecoin? What are the major differences between the Bitcoin and Litecoin? Why so many alt coins have been created? What are they usually based on? 6. What is Scrypt? Where is it used and how is it different from the original algorithm from which it has been created? 7. What is a demurrage currency? Could you please give an example of one blockchain and crypto currency that is demurrage? 8. What is a good example of an alternative algorithm to PoW? What is it called and how is it different from the PoW? Why the alternatives to Bitcoin PoW have been created? What is the main reason for this? What is dual-purpose PoW algorithms? Why have they been created? 9. Is Bitcoin “anonymous” currency? Is it difficult to trace transactions and understand someone’s spending habits? 10. What is Ethereum? What kind of currency does it use? What is the difference from Bitcoin? Chapter 10: Bitcoin security. 1. What is the main approach of Bitcoin security? 2. What are two common mistakes made by newcomers to the world of Bitcoin? 3. What is a root of trust in traditional security settings? What is a root of trust in Bitcoin network? How should you assess security of your system? 4. What is a cold storage and paper wallet? 5. What is a hardware wallet? How is it better than storing private keys on your computer or your smart phone?
submitted by 5tu to BitcoinTechnology [link] [comments]

BITCOIN MINING DIFFICULTY EXPLAINED IN 10 MINUTES! Bitcoin Q&A: Nonces, mining, and quantum computing Bitcoin Mining im Detail erklärt: Nonce, Merkle Root, SPV ... BitcoinWiki Channel - YouTube

For example, assuming a starting nonce of 0, valid subsequent nonce values would be 1, 2, 3, and so on. While a simple counter would provide a valid nonce, a more usual method of generating valid nonce values is to use a UNIX timestamp in milliseconds (i.e., the number of milliseconds transpired since the 1st of January 1970). Using a high ... Nonce definition is - the one, particular, or present occasion, purpose, or use. How to use nonce in a sentence. Did You Know? Nonce is a 32 bit arbitrary random number that is typically used once. In Bitcoin's mining process, the goal is to find a hash below a target number which is calculated based on the difficulty. Proof of work in Bitcoin's mining takes an input consists of Merkle Root, timestamp, previous block hash and few other things plus a nonce which is completely random number. This question helps identify the various components of the getwork "data" field, but I'm curious where the extraNonce comes from. My hunch is it's the first four bytes of the second half of the data, because I believe this is still part of the Merkle root (and yet, being in the second half of the data, it won't be part of the midstate). No forking Extra nonce added to Bitcoin header. #5102 timohanke wants to merge 1 commit into bitcoin : master from BlockheaderNonce2 : blockheader_nonce2 Conversation 45 Commits 1 Checks 0 Files changed

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BITCOIN MINING DIFFICULTY EXPLAINED IN 10 MINUTES!

Nonce - a number that can only be used once - in cryptography is a one-time code, vibrant overcome or pseudorandom manner, which is used to biopsy the main to do transmission, preventing to take... Try watching this video on www.youtube.com, or enable JavaScript if it is disabled in your browser. Want more resources and information on bitcoin and cryptocurrency?! https://genicsthecrypto.com-----💸Want to donate to me?💸 Leave a comment so I can properly thank you if you donate ... Who generates the nonce? What makes it random? How is nonce-guessing important to the competitive process of mining? What happens if the hashing algorithm (SHA-256) was compromised? Is quantum ... If you’re interested in the crypto world, and can’t pull the headphones out of your ears, welcome to the BitcoinWiki channel! Here you'll find voiced article...

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