The Bitcoin network recorded a minor one-block reorganization at height 966,500 after the mining pools SpiderPool and AntPool simultaneously mined valid blocks. Galaxy Research reported that both pools competed for the tip of the canonical chain after propagating their versions at the same time to different nodes across the ecosystem.
Bitcoin experienced a small 1 block reorg this morning. This is common: the third time in four weeks (962,722 on Aug. 16, 963,853 on Aug. 24). Here, Spiderpool had its chain obviated by Antpool.
Our node never saw the Antpool block until it confirmed and the chain extended on… pic.twitter.com/hx5lKPqR0f
— Galaxy Research (@glxyresearch) September 11, 2026
This phenomenon does not represent a security vulnerability or an attack on the network, but rather the ordinary operation of the Proof-of-Work consensus algorithm in the presence of global latency. When AntPool solved block 966,501, the nodes adopted its branch as the valid chain due to greater accumulated work, leaving SpiderPool’s version as an orphan block and discarding its estimated mining reward of 3.1389 BTC.
In less than a month, three similar cases have been reported, following events that occurred in August at blocks 962,722 and 963,853. The next step for analysts involves monitoring data propagation among the top global pools to verify whether latency between competing blocks creates a higher orphan rate.
Source: https://x.com/glxyresearch/status/2098450862222045506
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