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In STORE, BlockFin’s finality is a combination of absolute and probabilistic finalities. Once more than 2/3 of validators validate and sign the block containing the transactions, the block has absolute finality, hence the transactions included the blocks also have absolute finality. There is no need to wait for a predefined number of block confirmations as in Nakamoto consensus. However, BlockFin uses an asynchronous consensus algorithm and by definition, it doesn’t make any timing assumptions. So, as the number of signatures reaches the threshhold of > 2/3 of the total number of validators, the probability of finality reaches 1.