When a transaction is initiated but has not been added to the blockchain, it is said to be in a 0-confirmation state. Once the block the transaction is in has been approved by the network and appended to the end of the blockchain, it has one confirmation. The confirmation count increases by one as each new block is added to the blockchain.

Some service or exchange requires multiple confirmations before confirming a transaction as each confirmation greatly decreases the likelihood of a payment being reversed.

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