TWO BLOCKS AT 966,500 — THE NETWORK KEPT ONE, NOBODY DECIDED

The document is the chain. Block 966,500, mined by Antpool, timestamped September 11 at 04:30:30 UTC, 12:30 in the morning in New York. It carries 4,359 transactions and about 0.016 bitcoin in fees, 1.7 megabytes, and it sits in the chain that every node on the network agrees on. That much is on any public explorer.

What the public explorer does not show is the other 966,500. Galaxy Research, watching from its own node, saw a second valid block at the same height from Spiderpool, built on the same parent. Two blocks, both valid, both claiming the same slot. Galaxy’s note that morning: “Bitcoin experienced a small 1 block reorg this morning. This is common: the third time in four weeks.” The earlier two, by Galaxy’s count, were at 962,722 on August 16 and 963,853 on August 24.

Here is how it resolved, and who resolved it. Nobody. The next block, 966,501, was built on Antpool’s version. That made Antpool’s chain the one with more accumulated work, and every node that had briefly accepted Spiderpool’s block dropped it and followed the longer chain. That is the rule written into the software in 2009: the valid chain with the most work is the chain. No committee met. No exchange halted. No one signed anything.

What it cost: the pool that lost the race forfeited the block reward, 3.125 bitcoin plus the fees, about $241,000 at today’s price, for a block that was correct in every respect except timing. Who profits: the pool that found the next block first, which the public chain shows was also Antpool.

What it means for you: a transaction with one confirmation at 966,500 could, for a few seconds, have been in a block that no longer exists. That is why the old rule is six confirmations for anything that matters, and why an exchange that credits a deposit on one confirmation is taking the risk, not you.

Three of these in four weeks is not a fault. It is the network doing the one thing it was built to do, settle a disagreement between two honest miners without asking anyone. Every other ledger in the world has a person for that job.

At the time of this writing, bitcoin was $77,188 at 10:51 AM ET on Crypto.com.