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Seems unlikely that the FBI sitting on a way to break ECDSA would use it to recover $2 million. Much more likely that there was a tumbler or exchange that they were able to link to the attacker and use to seize funds. Maybe they even have backdoors in some popular crypto wallets.

Might cost more than $2MM in compute, but could be worth it to demonstrate capability.

Sounds plausible, that one. Also perhaps the ransom gang had a staging server with a bunch of keys somewhere.

But the tumbler idea actually seems more plausible to me.

they don't :(