Definition ∞ A fast finality protocol is a type of blockchain consensus mechanism designed to achieve irreversible transaction settlement within a very short timeframe. Unlike probabilistic finality where confirmation strengthens over time, these protocols aim for immediate or near-immediate cryptographic assurance of transaction immutability. This design significantly reduces the risk of transaction reversals or double-spending. It is particularly beneficial for high-frequency applications.
Context ∞ Fast finality protocols are a significant area of innovation in the blockchain domain, frequently discussed in the context of improving transaction speed and user experience. News often highlights projects that successfully implement such protocols, positioning them as solutions for enterprise adoption and real-time payment systems. The pursuit of fast finality directly addresses a key barrier to mainstream cryptocurrency usage.
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