A compulsory signaling interval solely occurs if miners have not already locked within the activation by way of voluntary signaling. That’s usually the popular end result (for many who assist the fork) because it alerts vast neighborhood buy-in, permits activating the fork sooner, and avoids some1 of the uncertainty of necessary signaling.
If and when necessary signaling begins, nodes working the activation consumer merely require all blocks in that interval to be signaling, and discard any that are not. So from their perspective, all blocks in that interval find yourself signaling, activating the fork with 100% miner assist. The issue (for many who assist the fork) is that miners can simply not sign and proceed constructing on the unique chain, at which level the chain can cut up into two, launching the mess that’s the neighborhood making an attempt to reconcile which of these chains has higher financial assist.
1 Even with profitable miner signaling there’s nonetheless uncertainty round false signaling, a possible URSF and so forth.
