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Blockchain, a sequential distributed database found in cryptocurrencies derived from bitcoin

Blockchain.info, a bitcoin wallet and explorer service

Cipher Block Chaining, a block cipher mode of operation in cryptography.

In cryptocurrencies, a fork is a situation when a blockchain diverges into two potential paths forward, with regard to transaction history or a new rule about valid transactions.As different parties need to use common rules to maintain the history of the blockchain, users of the blockchain must support one or the other.As a result of a rule fork, a blockchain can split, i.e. diverge into two separate paths forward. Forks have been used in cryptocurrencies in order to add new features to a blockchain or to reverse the effects of hacking or catastrophic bugs on a blockchain as was the case with the Bitcoin fork on 6 August 2010 or the fork between Ethereum and Ethereum Classic. Notably, blockchain forks have been widely discussed in the context of the bitcoin scalability problem.