jm Bitcoin CashL½So I suppose I made a mess of what I was going to say above. I will reiterate it, as maybe someone has a comment on it. Checkpoint depth 10, attacker gives 10 "secret" blocks to some nodes.
https://whatsonchain.com/tx/14570fa5731ec1fe276dcf8f91cb88a6d26cf8372b241e021d8867b0a16d6850