Finality

What Is Finality?

How Long Does Finality Take?

Source

This currently takes about two epochs, or roughly 13 minutes under normal network conditions. 

A research goal called single-slot finality aims to shorten this to around one 12-second slot. However, as of 2026, it has not shipped to the Ethereum mainnet and remains under active development.

Types of Finality

The two broad categories are probabilistic and deterministic finality. 

• Probabilistic finality: used by proof of work networks like Bitcoin, it means confidence grows with each additional confirmation but never reaches an absolute guarantee. 
• Deterministic finality: used by many proof of stake networks, it means a transaction is final the moment a defined set of validators signs off on it, and the protocol rules make no provision for reversing it.

Why Finality Matters

Finality is an essential feature for businesses that accept cryptocurrency payments. Waiting a long time for a transaction to settle can be inconvenient and costly, so low latency helps make a payment system practical. Companies also need to know within a short time frame whether they truly control an asset.

It’s worth noting that finality can, in rare cases, be affected by a chain reorganization, where the network temporarily settles on a different version of recent history before converging again. This is one reason many platforms wait for several confirmations rather than acting on a single one, balancing speed against the small residual risk of reversal.