BlockchainIntermediate#Tech#Consensus
Finality
F
Definition
The moment at which it becomes impossible to change or revert a transaction once it has been added to the blockchain.
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Concept Diagram
Key Takeaways
1
Finality is the point at which a blockchain transaction becomes irreversible and permanent
2
Ethereum achieves finality in about 12 minutes after two epochs of checkpoint confirmations
3
Bitcoin offers probabilistic finality — more confirmations make reversal exponentially harder
4
Instant finality chains like Solana and Hyperliquid confirm transactions in under a second
Practical Example
You send 10 ETH to an exchange on Ethereum — after ~12 minutes the transaction reaches finality and cannot be reversed. On Hyperliquid L1 the same transfer finalizes in under 2 seconds.
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Related Terms
Blockchain
SequencerA node in a Rollup (L2) responsible for ordering transactions before they are batched and sent to the L1 (Ethereum).
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Proposer-Builder Separation (PBS)A design where the task of proposing a block is separated from the task of building it, aimed at mitigating MEV centralization.
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Base Layer (Layer 1)The foundational blockchain architecture (e.g., Bitcoin, Ethereum) that provides security and finality for the entire network.
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Consensus MechanismA fault-tolerant process used in blockchain systems to achieve the necessary agreement on a single data value or network state.
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