SpacePay

Block Confirmation

Quick Answer

A block confirmation occurs when a transaction is included in a block added to the blockchain. More confirmations mean greater finality and lower risk of reversal.

Full Definition

A block confirmation occurs when a transaction is included in a block and that block is added to the blockchain. Each subsequent block mined on top of it adds another confirmation. More confirmations mean greater finality and lower risk of reversal. For payment processing, one confirmation is typically sufficient on proof-of-stake chains like Ethereum, while Bitcoin transactions usually require three to six confirmations for high-value payments.