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> On 21 July 2017, bitcoin miners locked-in a software upgrade referred to as Bitcoin Improvement Proposal (BIP) 91

> By 8 August, another milestone was reached when 100% of the bitcoin mining pools signaled support

https://en.wikipedia.org/wiki/SegWit#Activation

That's signaling, built into the end users fully-validating nodes, to coordinate between the miners producing blocks and nodes validating them. The validating nodes are the ones that offered up and then accepted the signaling.

Signalling is not consensus I’m afraid…

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