Bitcoin finality time

Bitcoin is the reference probabilistic chain: Nakamoto consensus never declares a block final, confidence simply grows with confirmation depth. The exchange deposit convention is 6 confirmations, and this benchmark reports the wall-clock time to reach it, 37.0 min (p50, 24h). Bitcoin block timestamps are miner-set and may legally skew by up to two hours, so the harness does not trust them. It polls the mempool.space tip height every 30 seconds and uses its own clock: T1 when a block first appears at the tip, T2 when the tip is 6 blocks past it. Expect high variance; block intervals are Poisson, so the 6-confirmation wait ranges from about 30 minutes to well over 90. A block with 6 confirmations can still be reversed by a deeper reorg, with probability that vanishes as depth grows.