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Scaling problem in bitcoin processing From Wikipedia, the free encyclopedia
The Bitcoin scalability problem refers to the limited capability of the Bitcoin network to handle large amounts of transaction data on its platform in a short span of time.[1] It is related to the fact that records (known as blocks) in the Bitcoin blockchain are limited in size and frequency.[2]
Bitcoin's blocks contain the transactions on the bitcoin network.[3]: ch. 2 The on-chain transaction processing capacity of the bitcoin network is limited by the average block creation time of 10 minutes and the original block size limit of 1 megabyte. These jointly constrain the network's throughput. The transaction processing capacity maximum estimated using an average or median transaction size is between 3.3 and 7 transactions per second.[2] There are various proposed and activated solutions to address this issue.
The block size limit, in concert with the proof-of-work difficulty adjustment settings of bitcoin's consensus protocol, constitutes a bottleneck in bitcoin's transaction processing capacity. This can result in increasing transaction fees and delayed processing of transactions that cannot be fit into a block.[4] Various proposals have come forth on how to scale bitcoin, and a contentious debate has resulted. Business Insider in 2017 characterized this debate as an "ideological battle over bitcoin's future."[5]
Increasing the network's transaction processing limit requires making changes to the technical workings of bitcoin, in a process known as a fork. Forks can be grouped into two types:
A hard fork is a change to the blockchain protocol that is not backward compatible and requires all users to upgrade their software in order to continue participating in the network. In a hard fork, the network splits into two separate versions: one that follows the new rules and one that follows the old rules.
For example, Ethereum was hard forked in 2016 to "make whole" the investors in The DAO, which had been hacked by exploiting a vulnerability in its code. In this case, the fork resulted in a split creating Ethereum and Ethereum Classic chains. In 2014 the Nxt community was asked to consider a hard fork that would have led to a rollback of the blockchain records to mitigate the effects of a theft of 50 million NXT from a major cryptocurrency exchange. The hard fork proposal was rejected, and some of the funds were recovered after negotiations and ransom payment. Alternatively, to prevent a permanent split, a majority of nodes using the new software may return to the old rules, as was the case of bitcoin split on 12 March 2013.[6]
A more recent hard-fork example is of Bitcoin in 2017, which resulted in a split creating Bitcoin Cash.[7] The network split was mainly due to a disagreement in how to increase the transactions per second to accommodate for demand.[8]
Bitcoin Cash ("BCH") is a hard fork of bitcoin increasing the maximum block size. Bitcoin XT, Bitcoin Classic and Bitcoin Unlimited each supported an increase to the maximum block size. On 1 August 2017, the day when BTC forked, the BTC blockchain split into two separate blockchains: one maintained in accordance with the rules currently valid for Bitcoin, and the other maintained in accordance with the rules currently valid for Bitcoin Cash. If one had coins on the Bitcoin chain prior to the fork and has not yet moved them, one could move them on one or the other or both chains. Thus, all holders of Bitcoin also became holders of Bitcoin Cash at the time of the split. Henceforth Bitcoin and Bitcoin Cash are separate and trade at entirely independent valuations relative to each other, fiat currencies, and other assets.
Bitcoin SV ("BSV") is a hard fork of Bitcoin Cash and offers a competing implementation of the Bitcoin protocol that aims to solve the Bitcoin scalability problem by implementing an unbounded block cap size,[9] enabling the network to produce blocks of unlimited size.
A soft fork is a backward-compatible change to the blockchain protocol that allows new rules to be introduced without requiring all users to upgrade their software. In a soft fork, a majority of the network’s miners implement the new rules and begin following the updated version of the blockchain. The rest of the network can continue to follow the blockchain, but they will be unable to validate that new blocks follow the updated rules. Because a soft fork is backward-compatible, it does not result in the creation of a new blockchain or the splitting of the network. Instead, it allows the network to gradually transition to the new rules while still maintaining compatibility with the old rules. [10]
Segregated Witness is an example of a soft fork.
In case of a soft fork, all mining nodes meant to work in accordance with the new rules need to upgrade their software.
Technical optimizations may decrease the amount of computing resources required to receive, process and record bitcoin transactions, allowing increased throughput without placing extra demand on the bitcoin network. These modifications can be to either the network, in which case a fork is required, or to individual node software (such as Bitcoin Core).
The Lightning Network (LN) is a protocol that aims to improve bitcoin's scalability and speed without sacrificing trustless operation.[14] The Lightning Network requires putting a funding transaction on the blockchain to open a payment channel. Once a channel is opened, connected participants are able to make rapid payments within the channel or may route payments by "hopping" between channels at intermediate nodes for little to no fee.
In January 2018 Blockstream launched a payment processing system for web retailers called "Lightning Charge", noted that lightning was live on mainnet with 200 nodes operating as of 27 January 2018 and advised it should still be considered "in testing".
On 15 March 2018, Lightning Labs released the beta version of its lnd Lightning Network implementation for bitcoin mainnet, and on 28 March 2018, ACINQ released a mainnet beta of its eclair implementation and desktop application.
In January 2019 the online retailer Bitrefill announced that it receives more payments in Bitcoin via the lightning network than any other cryptocurrency they accept.
In June 2021, the Legislative Assembly of El Salvador voted legislation to make Bitcoin legal tender in El Salvador.[15][16][17] The decision was based on the success of the Bitcoin Beach ecosystem in El Zonte that used a LN based wallet. The government will be introducing a wallet utilising the Lightning Network protocol while giving the freedom for citizens to use other Bitcoin Lightning wallets.[18]
Bitcoin's transaction throughput is limited by two parameters:
Bitcoin has a block time of 10 minutes and a block size of 1 MB. Various increases to this limit, and proposals to remove it completely, have been proposed over bitcoin's history. Litecoin produces blocks four times faster than Bitcoin which leads to a 4x improvement in throughput. Dogecoin has even more throughput with a block time of 1 minute. Bitcoin Cash has a block size of 32 MB and hence 32x more throughput than Bitcoin. Bitcoin SV removed the block size limit altogether.
Bitcoin Unlimited's proposal is different from Bitcoin Core in that the block size parameter is not hard-coded, and rather the nodes and miners flag support for the size that they want, using an idea they refer to as 'emergent consensus'. Those behind Bitcoin Unlimited proposal argue that from an ideological standpoint the miners should decide about the scaling solution since they are the ones whose hardware secure the network.
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