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Definition: zero confirmation transaction


A crypto transaction added to the blockchain without confirmation. Confirmations occur when new blocks are added because the linkage to and from the block with the transaction is validated by the network nodes. For example, Bitcoin confirmations require from one to six additional blocks, the latter taking up to an hour. Ethereum and other blockchains are much faster.

Zero confirmations means that in a trusted environment, the transaction can be added very quickly and confirmed later. For example, Layer 2 blockchains are used for small transactions that are summarized on the main chain, typically Bitcoin or Ethereum. See zero-knowledge proof.