This is a newbie question.

Let's make the following scenario: some hacker, with sheer luck (since finding a private key is so very improbable), manages to steal some bitcoins from one of the very early blocks (the first 5 were arguably mined by Satoshi). And then the hacker, being an anarchist, signs something like "i found a backdoor in secp256k1 lol".

What would be the most probable reaction from the crowds? How could I edge aginst this? I am looking for answers based on previous analogous situations in economics or finance (big surprise in something thought robust).

Thank you.