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1. What is Bitcoin (BTC)?
2. Bitcoin’s core featuresFor a more beginner’s introduction to Bitcoin, please visit Binance Academy’s guide to Bitcoin.
Unspent Transaction Output (UTXO) modelA UTXO transaction works like cash payment between two parties: Alice gives money to Bob and receives change (i.e., unspent amount). In comparison, blockchains like Ethereum rely on the account model.
Nakamoto consensusIn the Bitcoin network, anyone can join the network and become a bookkeeping service provider i.e., a validator. All validators are allowed in the race to become the block producer for the next block, yet only the first to complete a computationally heavy task will win. This feature is called Proof of Work (PoW).
The probability of any single validator to finish the task first is equal to the percentage of the total network computation power, or hash power, the validator has. For instance, a validator with 5% of the total network computation power will have a 5% chance of completing the task first, and therefore becoming the next block producer.
Since anyone can join the race, competition is prone to increase. In the early days, Bitcoin mining was mostly done by personal computer CPUs.
As of today, Bitcoin validators, or miners, have opted for dedicated and more powerful devices such as machines based on Application-Specific Integrated Circuit (“ASIC”).
Proof of Work secures the network as block producers must have spent resources external to the network (i.e., money to pay electricity), and can provide proof to other participants that they did so.
With various miners competing for block rewards, it becomes difficult for one single malicious party to gain network majority (defined as more than 51% of the network’s hash power in the Nakamoto consensus mechanism). The ability to rearrange transactions via 51% attacks indicates another feature of the Nakamoto consensus: the finality of transactions is only probabilistic.
Once a block is produced, it is then propagated by the block producer to all other validators to check on the validity of all transactions in that block. The block producer will receive rewards in the network’s native currency (i.e., bitcoin) as all validators approve the block and update their ledgers.
Block productionThe Bitcoin protocol utilizes the Merkle tree data structure in order to organize hashes of numerous individual transactions into each block. This concept is named after Ralph Merkle, who patented it in 1979.
With the use of a Merkle tree, though each block might contain thousands of transactions, it will have the ability to combine all of their hashes and condense them into one, allowing efficient and secure verification of this group of transactions. This single hash called is a Merkle root, which is stored in the Block Header of a block. The Block Header also stores other meta information of a block, such as a hash of the previous Block Header, which enables blocks to be associated in a chain-like structure (hence the name “blockchain”).
An illustration of block production in the Bitcoin Protocol is demonstrated below.
Block time and mining difficultyBlock time is the period required to create the next block in a network. As mentioned above, the node who solves the computationally intensive task will be allowed to produce the next block. Therefore, block time is directly correlated to the amount of time it takes for a node to find a solution to the task. The Bitcoin protocol sets a target block time of 10 minutes, and attempts to achieve this by introducing a variable named mining difficulty.
Mining difficulty refers to how difficult it is for the node to solve the computationally intensive task. If the network sets a high difficulty for the task, while miners have low computational power, which is often referred to as “hashrate”, it would statistically take longer for the nodes to get an answer for the task. If the difficulty is low, but miners have rather strong computational power, statistically, some nodes will be able to solve the task quickly.
Therefore, the 10 minute target block time is achieved by constantly and automatically adjusting the mining difficulty according to how much computational power there is amongst the nodes. The average block time of the network is evaluated after a certain number of blocks, and if it is greater than the expected block time, the difficulty level will decrease; if it is less than the expected block time, the difficulty level will increase.
What are orphan blocks?In a PoW blockchain network, if the block time is too low, it would increase the likelihood of nodes producingorphan blocks, for which they would receive no reward. Orphan blocks are produced by nodes who solved the task but did not broadcast their results to the whole network the quickest due to network latency.
It takes time for a message to travel through a network, and it is entirely possible for 2 nodes to complete the task and start to broadcast their results to the network at roughly the same time, while one’s messages are received by all other nodes earlier as the node has low latency.
Imagine there is a network latency of 1 minute and a target block time of 2 minutes. A node could solve the task in around 1 minute but his message would take 1 minute to reach the rest of the nodes that are still working on the solution. While his message travels through the network, all the work done by all other nodes during that 1 minute, even if these nodes also complete the task, would go to waste. In this case, 50% of the computational power contributed to the network is wasted.
The percentage of wasted computational power would proportionally decrease if the mining difficulty were higher, as it would statistically take longer for miners to complete the task. In other words, if the mining difficulty, and therefore targeted block time is low, miners with powerful and often centralized mining facilities would get a higher chance of becoming the block producer, while the participation of weaker miners would become in vain. This introduces possible centralization and weakens the overall security of the network.
However, given a limited amount of transactions that can be stored in a block, making the block time too longwould decrease the number of transactions the network can process per second, negatively affecting network scalability.
3. Bitcoin’s additional features
Segregated Witness (SegWit)Segregated Witness, often abbreviated as SegWit, is a protocol upgrade proposal that went live in August 2017.
SegWit separates witness signatures from transaction-related data. Witness signatures in legacy Bitcoin blocks often take more than 50% of the block size. By removing witness signatures from the transaction block, this protocol upgrade effectively increases the number of transactions that can be stored in a single block, enabling the network to handle more transactions per second. As a result, SegWit increases the scalability of Nakamoto consensus-based blockchain networks like Bitcoin and Litecoin.
SegWit also makes transactions cheaper. Since transaction fees are derived from how much data is being processed by the block producer, the more transactions that can be stored in a 1MB block, the cheaper individual transactions become.
The legacy Bitcoin block has a block size limit of 1 megabyte, and any change on the block size would require a network hard-fork. On August 1st 2017, the first hard-fork occurred, leading to the creation of Bitcoin Cash (“BCH”), which introduced an 8 megabyte block size limit.
Conversely, Segregated Witness was a soft-fork: it never changed the transaction block size limit of the network. Instead, it added an extended block with an upper limit of 3 megabytes, which contains solely witness signatures, to the 1 megabyte block that contains only transaction data. This new block type can be processed even by nodes that have not completed the SegWit protocol upgrade.
Furthermore, the separation of witness signatures from transaction data solves the malleability issue with the original Bitcoin protocol. Without Segregated Witness, these signatures could be altered before the block is validated by miners. Indeed, alterations can be done in such a way that if the system does a mathematical check, the signature would still be valid. However, since the values in the signature are changed, the two signatures would create vastly different hash values.
For instance, if a witness signature states “6,” it has a mathematical value of 6, and would create a hash value of 12345. However, if the witness signature were changed to “06”, it would maintain a mathematical value of 6 while creating a (faulty) hash value of 67890.
Since the mathematical values are the same, the altered signature remains a valid signature. This would create a bookkeeping issue, as transactions in Nakamoto consensus-based blockchain networks are documented with these hash values, or transaction IDs. Effectively, one can alter a transaction ID to a new one, and the new ID can still be valid.
This can create many issues, as illustrated in the below example:
Since the transaction malleability issue is fixed, Segregated Witness also enables the proper functioning of second-layer scalability solutions on the Bitcoin protocol, such as the Lightning Network.
Lightning NetworkLightning Network is a second-layer micropayment solution for scalability.
Specifically, Lightning Network aims to enable near-instant and low-cost payments between merchants and customers that wish to use bitcoins.
Lightning Network was conceptualized in a whitepaper by Joseph Poon and Thaddeus Dryja in 2015. Since then, it has been implemented by multiple companies. The most prominent of them include Blockstream, Lightning Labs, and ACINQ.
A list of curated resources relevant to Lightning Network can be found here.
In the Lightning Network, if a customer wishes to transact with a merchant, both of them need to open a payment channel, which operates off the Bitcoin blockchain (i.e., off-chain vs. on-chain). None of the transaction details from this payment channel are recorded on the blockchain, and only when the channel is closed will the end result of both party’s wallet balances be updated to the blockchain. The blockchain only serves as a settlement layer for Lightning transactions.
Since all transactions done via the payment channel are conducted independently of the Nakamoto consensus, both parties involved in transactions do not need to wait for network confirmation on transactions. Instead, transacting parties would pay transaction fees to Bitcoin miners only when they decide to close the channel.
One limitation to the Lightning Network is that it requires a person to be online to receive transactions attributing towards him. Another limitation in user experience could be that one needs to lock up some funds every time he wishes to open a payment channel, and is only able to use that fund within the channel.
However, this does not mean he needs to create new channels every time he wishes to transact with a different person on the Lightning Network. If Alice wants to send money to Carol, but they do not have a payment channel open, they can ask Bob, who has payment channels open to both Alice and Carol, to help make that transaction. Alice will be able to send funds to Bob, and Bob to Carol. Hence, the number of “payment hubs” (i.e., Bob in the previous example) correlates with both the convenience and the usability of the Lightning Network for real-world applications.
Schnorr Signature upgrade proposalElliptic Curve Digital Signature Algorithm (“ECDSA”) signatures are used to sign transactions on the Bitcoin blockchain.
However, many developers now advocate for replacing ECDSA with Schnorr Signature. Once Schnorr Signatures are implemented, multiple parties can collaborate in producing a signature that is valid for the sum of their public keys.
This would primarily be beneficial for network scalability. When multiple addresses were to conduct transactions to a single address, each transaction would require their own signature. With Schnorr Signature, all these signatures would be combined into one. As a result, the network would be able to store more transactions in a single block.
The reduced size in signatures implies a reduced cost on transaction fees. The group of senders can split the transaction fees for that one group signature, instead of paying for one personal signature individually.
Schnorr Signature also improves network privacy and token fungibility. A third-party observer will not be able to detect if a user is sending a multi-signature transaction, since the signature will be in the same format as a single-signature transaction.
4. Economics and supply distributionThe Bitcoin protocol utilizes the Nakamoto consensus, and nodes validate blocks via Proof-of-Work mining. The bitcoin token was not pre-mined, and has a maximum supply of 21 million. The initial reward for a block was 50 BTC per block. Block mining rewards halve every 210,000 blocks. Since the average time for block production on the blockchain is 10 minutes, it implies that the block reward halving events will approximately take place every 4 years.
As of May 12th 2020, the block mining rewards are 6.25 BTC per block. Transaction fees also represent a minor revenue stream for miners.
BankDex is a user-friendly decentralized exchange, which ensures fiat trading with fast withdrawals and near-feeless transactions. Our team aims to involve new users in blockchain community by eliminating barriers relating with the complexity of buying, transferring & cashing out assets. In this article we research crypto exchanges market and our potential share at first, and then show our benefits and solutions and how it works.submitted by hayrimavi1 to ico [link] [comments]
DEX market overview
Encrybit team revealed real-time cryptocurrency exchange problems survey insights1. 1108 crypto traders were questioned: “What are the biggest concerns that you see in currently available exchanges!”. The main issues faced are:
The second question was which exchange do you like, and virtually all respondents referred to centralized exchanges (CEX) here. This survey can be supported by market researches. Trading data from six major centralized exchanges (Binance, Bitfinex, Bithumb HitBTC, Huobi and OKEX) was compared to that from nine leading decentralized exchanges (Bancor Network, BitShares, DDEX, EtherDelta, ForkDelta, IDEX, OpenLedger, StellarTerm, and the Waves Platform). The share of DEX was only 2% of the total trading volume2. The reason is clear: the current generation of DEX has made progress only in security concerns3, while contributing to all other problems and suffering new, like fragmented markets4, no fiat support5, no scaling6, the impossibility of transactions between different blockchains7. Also clear that market is looking forward to flagman product which will eliminate challenges and will enable market growth. Experts highly estimate its potential. Increasing the number of institutional investors8, DEXs should reach up to 4% of total crypto market volume within the next two years. This would mean growth of 5–20x for DEX usage.
A Primer to BankDex
BankDex is a decentralized exchange built in response to the demands of the cryptocurrency users, for a simplified and enhanced trading platform. The platform is built on a robust ecosystem that promotes an enriched user experience, low latency, greater liquidity and security for user transactions.
BankDex employs a loose mesh topology powered by kernel nodes which are responsible for faster transaction persistence and validation. In addition to ensuring faster transactions that can be completed in less than a second, they are also highly resistant to security attacks by being Asynchronous Byzantine Fault Tolerant (aBFT).
The exchange features an impressive collection of crypto — crypto pairing across its network. The array of its supported tokens and cryptocurrencies currently includes BTC, XRP, XLM, ADA, ETH, TRX, EOS, QNT, VIBE, MKR, ZIL and REM, with many more to be added along the timeline.
BankDex allows its users to withdraw funds for free from their wallet. Third party wallet integration is also one of those features to be integrated in the near future. The BankDex transaction management system is both unique and secure, ensuring a flawless trading platform for cryptocurrency users.
Latency and Cryptocurrency Exchanges
Traders handling large quantities of cryptocurrency trade often find themselves in need of an exchange with one particular feature — low latency. In the simplest of terms, latency can be defined as the delay to receive a response after a request is made. As it connects with trading, latency affects the amount of time required for traders to mingle with the market.
Latency, in trading terms, implies to the speed with which a trading platform can react to the present status of the market. Trading platforms integrate programs specially designed to buy and sell assets in less than a second. Low latency means that these platforms are able to react faster to the actions of the market. The rapid nature of today’s market enables traders to make a significant amount of money.
Traders who take part in such kind of trade look for very low latency, somewhere in the range 10 milliseconds to 0.1 milliseconds. This kind of speed limit can be reliably accomplished by machines only. For low latency trades to be worthwhile and lucrative, users require an exchange that can handle such high speeds. The ideal latency will figure around a speed of 0.5ms, but this is quite difficult to accomplish.
Managing Latency in BankDex
BankDex decentralized cryptocurrency exchange addresses the latency issue with the lightning network concept, which ensures faster and safer trade of crypto & fiat currency. It overcomes the scalability issues, inherent to blockchain and enhances the throughput and latencies associated with a transaction.
The trading exchange consists of seven blockchains, which communicate with the core through a set of communication protocols. The communication between the different blockchains is established with the help of an interoperable blockchain router.
BankDex and the Lightning Network
A lightning network can be described as a protocol layer that enables low-latency, high volume digital micropayments without the help of an intermediary. The fundamental technology of lightning network involves a payment channel, a local two-party consensus.
Both the parties involved in the transaction sends an initial amount of Bitcoin, or any cryptocurrency token into a multisignature transaction. The multisignature transaction involves a local consensus on the existing balance that is allocated between the two parties in the transaction.
Any update regarding the allocation of the existing balance can be only be made with the cooperation of both entities involved in the transaction. This is done with the help of a new transaction that spends the funds allocated for the multisignature transactions allocated to each party.
Website : https://www.bankdex.io/ Twitter : https://twitter.com/bank_dex Facebook : https://www.facebook.com/bankdex.io Telegram : https://t.me/BankdexChatOfficial Whitepaper : https://www.bankdex.io/index.php/white-pape Technical Paper : https://www.bankdex.io/wp-content/uploads/2019/05/Technical-Paper.pdf
Bounty0x username : nefsim
ETH: 0x4e03Bf5CCE3eec4Ddae4d3d6aAD46ca4f198AeD6 BTC: 1GqWMZRRygRJJWYYTWHkAVoRcgyQHjgBMZ XMR: 42Y1S1KBoPk381kc7hA68zaiC78BxMoCADjLrFcTdWiE7ejhZc49s1t9i7P2EmTnHsLDiKoSUiogCbLVHXRJxjrCT4WG8ic XRB: xrb_1bpzh745s9kzk8ymfnks3jtdi65ayumdstokzd4yw4ohu3fopxmiocjcntcu
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The United Kingdom has what it takes to become a true leader in the crypto space, according to a new report covered in today’s Bitcoin in Brief. Also in The Daily, the British Crown dependency of Jersey has adopted new requirements for ICO projects to better protect participating investors, Malta now has a two-way bitcoin ATM, and Hong Kong has been promised thousands of crypto payment terminals.
Britain Set To Become Crypto Economy Leader, Report
The United Kingdom is in a good position to be a leader in the crypto economy and the implementation of blockchain technologies, according to a new report quoted by the British press. Britain has all the required resources, the authors claim, as well as industrial and governmental will to become a global hub for the technology by 2022. The analysis has been conducted by Big Innovation Centre, DAG Global and Deep Knowledge Analytics.
The gap between the traditional financial system and the crypto economy in the UK will close, DAG Global CEO Sean Kiernan believes. “The UK is a major global financial hub and in recent years has become a fintech leader as well. At the same time, it is starting to demonstrate significant potential to become a leader in blockchain technologies and the crypto economy,” he said, quoted by The Guardian.
The research, carried out in coordination with the parliamentary group on blockchain, has taken into consideration the £500m (~650 million) worth of investments into UK blockchain companies made in 2017–18 to conclude that the United Kingdom has the potential to become a world leader in the digital and crypto ecosystem within the next few years. “We are still at the early stages of the blockchain industry’s development and the huge impact it undoubtedly will have in Britain and globally,” said Birgitte Andersen, chief executive of Big Innovation Centre.
Jersey Introduces Requirements for ICO Projects
The Financial regulator of Jersey, one of the Channel Islands, has taken measures to protect investors participating in Initial Coin Offerings (ICOs). In a guidance note released this month, the Jersey Financial Services Commission (JFSC) provides basic definitions of cryptocurrencies, digital tokens, and token sales. It recognizes that their use “has risen dramatically” but also warns about the associated risks like high levels of price volatility, loss of funds through cyber-attacks, the high number of scams and pump-and-dump schemes.
Nevertheless, the JFSC states that most ICOs are unlikely to be regulated. Instead, the Commission places some conditions on the issuers of coins under the Island’s statutory instrument governing capital raising, the Control of Borrowing Order, noting for instance that a consent from the JFSC is required to establish a Jersey company. In granting such consent, regulators say, the JFSC may choose to impose certain conditions on the respective entity. Jersey-based ICO issuers are also required to be incorporated as a Jersey company and administered through a trust and company service provider licensed by the JFSC under the Financial Services Law.
The Commission classifies digital coins in two major categories — security and non-security tokens. The latter have been divided into “utility token” — “a usage right or the right to access a product or service”, and “cryptocurrency token […] designed to behave like a currency, being a store of value and medium of exchange.”
The document also lists a number of requirements that apply to ICO issuers and describes certain procedures and processes that should be followed in order to mitigate and manage the risks for retail investors. Companies are expected to apply anti-money laundering and counter-terrorist financing measures as well as inform investors about the risks.
In recent years, the British Crown dependency, situated off the French coast of Normandy, has attracted many startups from the crypto space. In the summer of 2015, the Government of Jersey released a consultation paper on cryptocurrencies, becoming one of the first jurisdiction in Europe to address the regulatory challenges in the fintech industry.
Malta Acquires Two-Way Crypto ATMMalta, another crypto-friendly European destination, has reportedly acquired its first two-way automated teller machine exchanging cryptocurrency with fiat. Last week, a company called Moon Zebra launched the ATM located at the Quicklets offices, on Tower Road in Sliema. It operates Monday through Friday, 9 am — 6:30 pm.
The new BATM offers users the opportunity to buy and sell two cryptocurrencies, bitcoin (BTC) and litecoin (LTC). Moon Zebra claims this is the first device offering two-way transactions with cash. Another teller machine supporting purchases of cryptocurrency strangely disappeared last year. According to Coinatmradar, two other devices are also operational not far from Moon Zebra’s ATM, but both are buy only machines. One of them offers BTC, and the other supports BTC and LTC purchases.
The launch of the new BATM comes after the island nation took another step towards becoming one of the most crypto-friendly nations in Europe. Recently, the parliament in Valletta adopted three laws designed to introduce clear regulations for the country’s growing crypto industry. It’s been reportedthat the largest crypto exchange by trade volume, Binance, is considering a project to launch a “decentralized bank” in Malta. The favorable business climate has attracted other large crypto businesses to the island, including the Chinese exchange Okex and the Polish Bitbay.
Hong Kong Promised 5,500 Crypto POS Terminals
The Indonesian startup Pundi X is working to build a network of 5,500 POS terminals in Hong Kong supporting payments in a number of cryptocurrencies, the South China Morning Post reported. The devices will be able to connect not only to crypto wallets but also with other traditional payment methods like Visa, MasterCard, and Apple Pay.
According to Pundi X CEO, Zac Cheah, Hong Kong is the ideal place to test the payment network. His company has ambitious plans to introduce up to 100,000 crypto POS terminals in Southeast Asia by 2021. Recently, a chain of restaurants in Hong Kong installed crypto point-of-sale devices in partnership with the Indonesian startup. Pundi X claims that in the last six months 25,000 of its terminals have been ordered by businesses in Japan, Singapore, South Korea, and Switzerland.
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