Definition ∞ Bitcoin finality refers to the irreversible quality of transactions once they are recorded on the Bitcoin blockchain. Although transactions gain immutability after one confirmation, a greater number of subsequent confirmations provides a stronger probabilistic assurance of finality. This characteristic ensures that a transaction, once included in a block and followed by additional blocks, becomes exceptionally resistant to alteration or reversal. It forms the basis of the network’s security model.
Context ∞ The duration required for a high degree of Bitcoin finality is a frequent point of comparison with newer, faster blockchain systems. News often addresses Bitcoin’s finality in relation to its security versus the speed of alternative chains. Discussions continue regarding the practical implications of probabilistic finality for diverse applications, especially high-value transfers.
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