DESIGN
The unit of account of the bitcoin system is the bitcoin. Currency codes for representing bitcoin are BTC[a] and XBT. Its Unicode character is ₿.[1] One bitcoin is divisible to eight decimal places.[6]: ch. 5 Units for smaller amounts of bitcoin are the millibitcoin (mBTC), equal to 1⁄1000 bitcoin, and the satoshi (sat), which is the smallest possible division, and named in homage to bitcoin's creator, representing 1⁄100000000 (one hundred millionth) bitcoin.[2] 100,000 satoshis are one mBTC.
SUPPLY
The successful miner finding the new block is allowed by the rest of the network to collect for themselves all transaction fees from transactions they included in the block, as well as a pre-determined reward of newly created bitcoins. As of 11 May 2020, this reward is currently 6.25 newly created bitcoins per block. To claim this reward, a special transaction called a coinbase is included in the block, with the miner as the payee. All bitcoins in existence have been created through this type of transaction. The bitcoin protocol specifies that the reward for adding a block will be reduced by half every 210,000 blocks (approximately every four years). Eventually, the reward will round down to zero, and the limit of 21 million bitcoins[h] will be reached the record keeping will then be rewarded by transaction fees only.
DECENTRALIZATION
Bitcoin does not have a central authority.
The bitcoin network is peer-to-peer without central servers.
The network also has no central storage; the bitcoin ledger is distributed.
The ledger is public; anybody can store it on a computer.
There is no single administrator; the ledger is maintained by a network of equally privileged miners.
Anyone can become a miner.
The additions to the ledger are maintained through competition. Until a new block is added to the ledger, it is not known which miner will create the block.
The issuance of bitcoins is decentralized. They are issued as a reward for the creation of a new block.
Anybody can create a new bitcoin address (a bitcoin counterpart of a bank account) without needing any approval.
Anybody can send a transaction to the network without needing any approval; the network merely confirms that the transaction is legitimate.
Conversely, researchers have pointed out at a "trend towards centralization". Although bitcoin can be sent directly from user to user, in practice intermediaries are widely used.220–222 Bitcoin miners join large mining pools to minimize the variance of their income. 2015, 2019–222 Because transactions on the network are confirmed by miners, decentralization of the network requires that no single miner or mining pool obtains 51% of the hashing power, which would allow them to double-spend coins, prevent certain transactions from being verified and prevent other miners from earning income. As of 2013 just six mining pools controlled 75% of overall bitcoin hashing power. In 2014 mining pool Ghash.io obtained 51% hashing power which raised significant controversies about the safety of the network. The pool has voluntarily capped their hashing power at 39.99% and requested other pools to act responsibly for the benefit of the whole network. Around the year 2017, over 70% of the hashing power and 90% of transactions were operating from China.[56]
According to researchers, other parts of the ecosystem are also "controlled by a small set of entities", notably the maintenance of the client software, online wallets and simplified payment verification (SPV) clients.
HISTORY
The domain name bitcoin.org was registered on 18 August 2008.On 31 October 2008, a link to a paper authored by Satoshi Nakamoto titled Bitcoin: A Peer-to-Peer Electronic Cash System was posted to a cryptography mailing list. Nakamoto implemented the bitcoin software as open-source code and released it in January 2009. Nakamoto's identity remains unknown.
On 3 January 2009, the bitcoin network was created when Nakamoto mined the starting block of the chain, known as the genesis block. Embedded in the coinbase of this block was the text "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks".[10] This note references a headline published by The Times and has been interpreted as both a timestamp and a comment on the instability caused by fractional-reserve banking.
The receiver of the first bitcoin transaction was Hal Finney, who had created the first reusable proof-of-work system (RPoW) in 2004. Finney downloaded the bitcoin software on its release date, and on 12 January 2009 received ten bitcoins from Nakamoto.Other early cypherpunk supporters were creators of bitcoin predecessors: Wei Dai, creator of b-money, and Nick Szabo, creator of bit gold.[84] In 2010, the first known commercial transaction using bitcoin occurred when programmer Laszlo Hanyecz bought two Papa John's pizzas for ₿10,000 from Jeremy Sturdivant.
You must be logged in to post a comment.