Bitcoin Core developer Cory Fields, of MIT's Digital Currency Initiative, proposed "quantum landmines" on the bitcoin-dev mailing list: an attacker moving vulnerable coins must lock matching collateral from a quantum-safe wallet, with both amounts frozen for a set period, such as 30 days. A prepared owner could then reveal hidden proof of ownership and claim both coins. The scheme would not recover lost coins, and legitimate holders moving exposed bitcoin would also need collateral. Fields called the ideas thought experiments requiring unwritten enforcement rules and quantum-safe wallets.

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