Nyoro~n · 3w its a soft fork because all current versions of Bitcoin remain compatible with bip110 blocks as it is using exisiting consensus rules and not adding new ones fun fact: a ursf contrary to it's name is... Bill Cypher @Bill Cypher 1771690757 Be as pedantic as you want. All it takes it 1 op return and you are a hard fork. My bet is somebody drops a time locked transaction to block 1 after the activation to force the issue.