Foundry USA, currently the largest Bitcoin mining pool, produced seven consecutive blocks on Monday, setting off a rare two-block chain reorganization on the Bitcoin network. The event temporarily orphaned valid blocks that had been mined by AntPool and ViaBTC, two competing pools. Such reorganizations, while uncommon, occur when competing chains emerge nearly simultaneously.
The network resolved the situation as intended, selecting the chain that carried the greatest cumulative proof of work. This built-in mechanism ensures that the longest and most computationally supported chain is recognized as the authoritative one. No intervention was required, and the network continued operating without lasting disruption.
Despite the orderly resolution, the incident draws attention to a broader structural trend in the Bitcoin mining industry. Shrinking profit margins are pushing hashrate — the total computational power dedicated to mining — into a smaller number of large pools. As fewer entities control greater shares of the network’s mining capacity, the probability of any single pool mining multiple blocks consecutively increases.
When blocks are discovered nearly at the same time by different pools, short-lived competing chains can form. The greater a pool’s share of total hashrate, the more likely it is to produce such streaks and, in turn, trigger temporary reorganizations. While these events are resolved automatically, their frequency may rise alongside continued consolidation in the mining sector.
Analysts note that a two-block reorganization does not pose a meaningful threat to Bitcoin’s overall security. The network’s consensus rules are specifically designed to handle such scenarios without compromising the integrity of confirmed transactions. However, the underlying conditions that produced the event — concentrated hashrate and compressed industry margins — remain a point of ongoing discussion among those who monitor network health.
Originally reported by CoinDesk.
