This is a fun idea 
. It reminds me of this IC3 paper; essentially, create bug bounties that give people incentive to claim the bug bounty rather than exploit it (and hopefully safely recover from this as well).
That being said, Iām not sure this is totally practical. I think the benefit one would get from hiding their quantum computer and then breaking everything is much greater than they would get from any amount of ETH we might put in a bounty (if theyāre evil). And if they arenāt hiding their work, then there really isnāt a need to make this happen automatically.
Also, having the ācanary [ā¦] be triggered before any production crypto is at riskā seems like a hard problem. It requires us to judge how for the canary breaking is from the quantum computer that breaks everything else. Weād probably have to be very conservative here, in which case letās just be conservative in a manual manner and not pay a bounty.