Bitcoin miner concentration just exposed a gap in Bitcoin’s “six confirmations” rule

The Bitcoin network experienced a rare two-block reorg on Mar. 23, at block height 941,880. Foundry mined six consecutive blocks, AntPool and ViaBTC briefly extended a competing branch. The chain resolved the fork as designed, following the path with the most hash rate. Bitcoin performed exactly as designed and validated its assumptions. A fork visualization shows Foundry USA’s chain winning over a competing AntPool-…