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  1. Home
  2. /Glossary
  3. /Finality
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blockchain

Finality

The guarantee that a blockchain transaction can't be reversed or altered once confirmed.

Definition

The guarantee that a blockchain transaction can't be reversed or altered once confirmed. Bitcoin has probabilistic finality that gets stronger with each confirmation. Some chains like Solana and Avalanche offer faster finality, sometimes in under a second.

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Related Terms

Consensus Mechanism

The method a blockchain uses to agree on which transactions are valid and in what order.

Transaction

A transfer of value or data recorded on a blockchain.

Block

A bundle of transactions that gets permanently added to the blockchain.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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