How Does Transaction Finality Relate to the Risk of Double-Spending?

Transaction finality is the guarantee that once a transaction is recorded on the blockchain, it cannot be reversed or altered. In Proof-of-Work, finality is probabilistic, increasing with the number of confirmations.

The risk of double-spending decreases significantly as the number of confirmations increases, as it becomes exponentially more expensive for an attacker to rewrite a chain with many blocks. High finality mitigates double-spending risk.