(1) For an earlier type of printer, 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.