I have to defer to Paul on this one: https://github.com/nostr-protocol/nips/pull/715#issuecomment-1675301250
Discussion
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Needs verification. Maxim was saying the same thing, but no one cracked a key yet. If it's 2^128 that's safe, IMHO. 2^40 would be a worry.
It's always possible that crypto has a lifetime. But that lifetime could be very long.