Finality in blockchain is the assurance that once a transaction is recorded, it won’t change. This concept builds confidence in the system, as users know their transactions are permanent. The article breaks down different types of finality, emphasizing that finality is conditional on community beliefs and can strengthen over time. Four main types of finality are explored: social, protocol, honest threshold, cryptoeconomic, and representative finality. Social finality relies on shared beliefs within the community. For example, the Ethereum genesis block is immutable in practice because the community has agreed to uphold it. However, if a new system claims to be Ethereum with a different genesis block, this could challenge that belief. Time plays a significant role; the longer a transaction exists without challenge, the more socially accepted it becomes. Protocol finality, on the other hand, depends on the blockchain’s design to prevent issues like double spending through a majority voting mechanism among nodes. Honest threshold finality assumes that the majority of nodes will act honestly, ensuring security against potential attacks. In stake-based systems, users must keep their validator views updated to maintain this honesty. Cryptoeconomic finality enhances this concept by requiring validators to stake assets, making dishonest actions costly. Finally, representative finality uses randomly selected committees to validate transactions, which increases scalability but requires stronger assumptions about the honesty of committee members. Overall, finality strengthens with time as transactions gain layers of assurance. A transaction transitions from a simple proposal to a socially accepted fact as it accumulates confirmations and becomes embedded in the blockchain's history. However, absolute finality only exists at the social level, where beliefs and community consensus ultimately determine the permanence of a transaction.