Which would either require an in protocol slashing event or a hard fork. In which case the fork with the broadest legitamacy would prevail (see the events aroun

Which would either require an in protocol slashing event or a hard fork. In which case the fork with the broadest legitamacy would prevail (see the events around the Steem/Hive hard fork). Blockchains cannot escape being fundamentally social creatures with values and priorities and the communities around those chains will ultimately have the last word about their operation.