> the case where you controlled the protocol on the machines of a partitioned network (eg., so you release a new version of btc which uses exploitable crytograp

> the case where you controlled the protocol on the machines of a partitioned network (eg., so you release a new version of btc which uses exploitable crytography Such a change would be treated as a "monopoly money" fork by those wanting to transact, and ignored. "No I don't want your fake money; send me real BTC or GTFO". This is why miners cannot arbitrarily change the protocol in their favour even today.