Transaction Finality

Transaction Finality is the guarantee that a transaction cannot be reversed, changed or cancelled once completed. The Hepton use Byzantine Fault Tolerance-Based (BFT) protocols for fast finality. There will be three status for a block:

result	status	mark
0	Unknown	The status of the current block is unknown
1	Justified	The current block has reached a preliminary consensus, but there is a certain chance to discard it
2	Finalized	The current block has reached a final consensus and will not be forked and discarded

Besides, the Hepton use a longest chain (actually, largest total difficulty) rule to chose a branch that without Finalized blocks.

So, about the finality, there will be three conditions:

1. Check the block status by using the RPC API eth_getblockpredictstatus, if the block is Finalized, then it reach the finality. Normally, a block can be finalized as fast as there are 3 block comfirmations.

Or you can use eth_getlastfinalizedblockinfo to get the latest finalized block.

1. If a block and any of its descendant block is not Finalized, then it's probabilistic safe for finality in 25 comfirmations.
2. If a block and any of its descendant block is not Finalized, then it's safe for finality in 81 comfirmations