On-chain basics
Finality
Finality is the point after which a transaction cannot be reversed or reorganised out of the chain.
Probabilistic on proof-of-work chains (more confirmations = safer), deterministic on many proof-of-stake chains. Exchanges set confirmation counts to reach acceptable finality.
On Swap.bz
Confirmation requirements per asset are why BTC→SOL is slower than SOL→BTC.
Related terms
Confirmations
A confirmation is one block mined on top of the block containing your transaction; exchanges wait for several before treating a deposit as final.
Chain reorganisation (reorg)
A reorg happens when the network replaces recent blocks with a longer competing chain, potentially dropping transactions that were in the replaced blocks.
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