A confirmation in cryptocurrency refers to the network-level verification that occurs when a transaction is included in a block, and then followed by additional blocks. The first confirmation typically means the transaction has been mined or proposed and accepted into a block. Each subsequent block added on top increases the transaction’s confirmation count, making it harder to reverse.
How confirmations work on a blockchain
When you broadcast a transaction, it is first seen by nodes and usually sits in a mempool waiting to be picked up by a block producer, such as a miner in Proof of Work or a validator in Proof of Stake. Once included in a block that becomes part of the canonical chain, the transaction has 1 confirmation. If five more blocks are built on top of that block, the transaction then has 6 confirmations.
Confirmations matter because many blockchains have probabilistic finality, meaning the network can occasionally reorganize if competing blocks are found and one chain becomes longer or otherwise preferred. A deeper transaction, one with more confirmations, is less likely to be affected by a reorg.
Practical context and common confusion
Wallets and block explorers often show a confirmation counter or status like “pending,” “confirmed,” and “finalized.” For example, exchanges may require a deposit to reach a certain number of confirmations before crediting your account, especially for larger amounts. This reduces the risk that a deposit transaction is reversed by a chain reorganization.
It is also worth distinguishing transaction confirmations from “wallet confirmation messages.” Some wallets use signed messages to prove ownership of an address for logins or verification, but those signatures do not create an on-chain transaction and do not receive block confirmations.
Confirmations matter across the crypto ecosystem because they are a simple, widely used signal of settlement confidence, helping users, merchants, and exchanges balance speed against security.