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Definition: chain


(1) See chain printer.

(2) An abbreviation of "blockchain." A major chain such as Bitcoin or Ethereum is known as the "main chain," "mainnet" or "Layer 1 network." Auxiliary chains that handle transactions that are eventually summarized onto the "main chain" are known as "sidechains" or "Layer 2 chains." See blockchain, sidechain, Layer 2 blockchain and mainnet.