Bitcoin sees a rare 2-block reorg as Foundry wins block race

Bitcoin has recorded a two-block chain reorganization, after Foundry mined seven consecutive blocks and replaced two blocks produced by AntPool/ViaBTC. The contention played out around blocks 941881–941882, when Foundry and AntPool/ViaBTC were extending competing branches at the same time. Foundry ultimately built the chain with more cumulative work, which the network recognizes as the best chain. As a result, AntPool and ViaBTC's two blocks became stale and are now orphaned—excluded from the permanent ledger. Reorgs occur because Bitcoin follows a simple rule: the chain with the most cumulative work prevails. When two miners find valid blocks nearly simultaneously, the network can briefly split as different nodes follow different tips. The tie is broken when a subsequent block is mined on top of one branch, making it the longer chain; blocks on the losing branch are discarded as stale and earn their miners no reward. A two-block reorg means the competition persisted across two consecutive blocks before resolving. It is uncommon, though not unprecedented. H/t @0xB10C