This is a cooldown feature that prevents 2 consecutives conflicting proofs for the same utxo from being added to a pool in under 1 minute. This will make it impossible for an attacker to generate a large number of votes by suppying conflicting proofs in series. The value of 1 minute is chosen so that it is much larger than the expected convergence time for an avalanche vote, but low enough that it won't prevent a legit proof from being voted on.
This cooldown will later be expanded to prevent a proof that has been voted and accepted from being overriden during a larger time (probably 1h). This will prevent an attacker from messing with our peer set by replacing the proof every minute (see above cooldown).
Depends on D10773.