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Block (on the bitcoin blockchain)
| Глоссарий по криптовалютам и блокчейну |
Data is permanently recorded in the bitcoin network through files called blocks. a block is a record of some or all of the most recent bitcoin transactions that have not yet been recorded in any prior blocks. new blocks are added to the end of the record (known as the blockchain), and can never be changed or removed once written (although some software will remove them if they are orphaned). each block memorializes what took place in the minutes before it was created. each block contains a record of some or all recent transactions and a reference to the block that came immediately before it. it also contains an answer to a difficult-to-solve mathematical puzzle – the answer to which is unique to each block. new blocks cannot be submitted to the network without the correct answer – the process of “mining” is essentially the process of competing to be the next to find the answer that “solves” the current block. the mathematical problem in each block is extremely difficult to solve, but once a valid solution is found, it is very easy for the rest of the network to confirm that the solution is correct. there are multiple valid solutions for any given block – only one of the solutions needs to be found for the block to be solved. because there is a reward of brand new bitcoins for solving each block, every block also contains a record of which bitcoin addresses or scripts are entitled to receive the reward. this record is known as a generation transaction, or a coinbase transaction, and is always the first transaction appearing in every block. the number of bitcoins generated per block starts at 50 and is halved every 210,000 blocks (about four years). bitcoin transactions are broadcast to the network by the sender, and all peers trying to solve blocks collect the transaction records and add them to the block they are working to solve. miners get incentive to include transactions in their blocks because of attached transaction fees. the difficulty of the mathematical problem is automatically adjusted by the network, such that it targets a goal of solving an average of 6 blocks per hour. every 2016 blocks (solved in about two weeks), all bitcoin clients compare the actual number created with this goal and modify the target by the percentage that it varied. the network comes to a consensus and automatically increases (or decreases) the difficulty of generating blocks. because each block contains a reference to the prior block, the collection of all blocks in existence can be said to form a chain. however, it’s possible for the chain to have temporary splits – for example, if two miners arrive at two different valid solutions for the same block at the same time, unbeknownst to one another. the peer-to-peer network is designed to resolve these splits within a short period of time, so that only one branch of the chain survives. the client accepts the ‘longest’ chain of blocks as valid. the ‘length’ of the entire block chain refers to the chain with the most combined difficulty, not the one with the most blocks. this prevents someone from forking the chain and creating a large number of low-difficulty blocks, and having it accepted by the network as ‘longest’
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Permanently, английский
Постоянно
Transactions, английский
Операции (в снс; понятия, относящиеся к реализации товаров и услуг экономическими единицами, получающими за это определенную компенсацию; по характеру объектов подразделяются на текущие, т. е. предназначенные для немедленного использования или потребления, и капитальные операции, т. е. по увеличению национального богатства)
Blockchain, английский
- A blockchain is a type of distributed ledger, comprised of unchangable, digitally recorded data in packages called blocks (rather like collating them on to a single sheet of paper). each block is then ‘chained’ to the next block, using a cryptographic signature. this allows block chains to be used like a ledger, which can be shared and accessed by anyone with the appropriate permissions.
- Shared, trusted, public ledger of transactions, that everyone can inspect but which no single user controls. it is a cryptographed, secure, tamper resistant distributed database. it solves a complex mathematical problem to exist. a blockchain is a perfect place to store value, identities, agreements, property rights, credentials, etc. once you put something like a bitcoin into it, it will stay there forever. it is decentralized, disintermediated, cheap and censorship resistant. applications of blockchain: bitcoin (cryptocurrency), namecoin (wants to replace the entire dns system of the internet), or sia (a decentralized cloud storage), ethereum (turing complete virtual machine where you can run any smart contract); any centralized service like ebay, dropbox can potentially be built in a decentralized way using blockchain technology, considerably lowering transaction costs
- Think of blockchain as a database or a spreadsheet. but a really special spreadsheet. there`s no centralized master copy. instead, it`s shared on many computers. it`s special because you can only add to it. there`s no editing of history. the database is divided into chronological sub-sheets. these are the blocks. the last line of any block summarizes all of the data in the block, and ч and this is pretty important ч appears as the first line of the next block. if anyone tries to edit a block, the last line will change and will not match the first line of the next block. the network sees this corrupted block and immediately replaces it. this ingenious trick makes it futile to rewrite history and guarantees an unprecedented degree of security. blockchain was invented by haber and stornetta in 1991 but made famous in the satoshi nakamoto`s bitcoin paper.
Immediately, английский
Немедленно; непосредственно
Mathematical, английский
- Analyzer, numerical integrator and computer эвм «маньяк»
- Математический
Essentially, английский
- По существу; главным образом см. substantially
- No существу; главным образом
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Consensus (bitcoin’s process consensus), английский
Developers suggest bitcoin improvements/modifications, small or big, proposals on github, bitcointalk, reddit, mailing lists, etc. discussion on this level is critical to enable smooth runtime consensus transitions.modifications with reference implementations get tested on the testnet. after successful testing deveopers implement the changes into the bitcoin software. who has a say in the consensus process?: (1) software developers (do the reference implementations), (2) miners (runtime consensus for mining blocks), (3) exchanges (they run nodes that validate transactions), (4) wallet companies (create transactions run on nodes), (5) merchants (merchant processing also through nodes)
Chain linking, английский
Chain linking is the process of connecting two blockchains with each other, thus allowing transactions between the chains to take place. this will allow blockchains like bitcoin to communicate with other sidechains, allowing the exchange of assets between them
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