Galaxy Research logs single-block Bitcoin reorg at height 966500

Galaxy Research said it recorded a Bitcoin reorganization at block height 966500, where Spiderpool and Antpool each found a valid block building on the same parent. That led to a brief competition between two candidate chains. In the end, the Antpool block was accepted because it became part of the chain with more cumulative work, while the Spiderpool block was dropped. The research firm said this was the third single-block reorg on Bitcoin in the past four weeks. The previous two took place at block heights 962722 and 963853. Galaxy Research also said its node did not observe the Antpool block until that block had been confirmed and the chain had already extended further on top of it. According to the firm, in a single-block reorg the network continues building on the chain with greater cumulative work, and the competing block is removed from the active chain. If a transaction was included in the replaced block, its confirmations disappear. Galaxy Research compared the event with deeper reorganizations seen on other networks, noting an 18-block reorg on Monero and a 100-block reorg on Bitcoin SV in 2021.