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Re:51% Attack Bleeds More Than $5M from Ethereum Classic by londons_explore on Friday August 07, 2020 @11:16PM (#24088636)
Hashpower is rented these days. So the question becomes 'how much hashpower you need for how many days'. Which has a dollar value.

If you are verifying a transaction of a given value, you would be stupid not to wait the dollar value of the hashpower required to reverse the transaction. If you run a service and someone could sign up for multiple accounts, you should take that into account too...

Re:51% Attack Bleeds More Than $5M from Ethereum Classic by AstralStorm on Saturday August 08, 2020 @01:52AM (#24089407)
Unless someone actually buys a facility (or facilities)with express purpose of making a monopoly, and does not rent it for cheap to others.

Detecting the attack or vulnerability to it is easy in smooth difficulty increasing proof of work systems by looking for spikes in difficulty... But waiting for too long is not acceptable.