What is "block chain"

Block chain \Block chain\ (Mach.) A chain in which the alternate links are broad blocks connected by thin side links pivoted to the ends of the blocks, used with sprocket wheels to transmit power, as in a bicycle.

Block chain may refer to:

• Blockchain (database), sequential distributed database found in cryptocurrencies derived from bitcoin
• Bar-link chain, a kind of mechanical drive chain
• Blockchain.info, a bitcoin wallet and explorer service, named after bitcoin's block chain database
• Cipher block chaining, a block cipher mode of operation in cryptography, usually abbreviated as CBC