What is Finality?

Finality is the guarantee that a transaction is permanently settled and cannot be reversed. Different networks reach finality differently: some offer near-instant, deterministic finality, while others gain probabilistic finality that strengthens with each additional confirmation. Once finalised, a transaction is effectively set in stone.

This matters because it tells you when funds are truly safe to rely on. Acting on a transaction before it is final risks a rare reversal, especially on networks with slower, probabilistic settlement.

Example: a network with fast finality lets a merchant accept payment confidently within seconds, whereas a probabilistic network may require several confirmations before the payment is considered locked in.

Safety note: for large transfers, wait for finality rather than acting on an unconfirmed or barely confirmed transaction, and understand your network’s finality model. Scammers may present a not-yet-final or later-reversed transaction as settled proof of payment. On any chain, finalised transactions are irreversible, so double-check details before sending, because there is no undo once finality is reached. Related terms include confirmation, consensus, transaction hash, and proof of stake.