A new proposal from BitMEX Research suggests a “canary” system as an alternative to preemptive Bitcoin freezes for quantum computing threats. The mechanism would only trigger a freeze on vulnerable coins if on-chain proof of a functional quantum computer emerges, instead of following a set timetable.
BitMEX Research has proposed an alternative strategy to the phased freeze outlined in BIP-361, which aims to protect Bitcoin from future quantum computers. The new plan introduces a “canary” watch state that avoids an automatic, full-scale freeze of vulnerable coins.
Instead, a freeze would only occur if there is on-chain proof that a quantum computer exists. This proof would be generated if funds are spent from a special, predetermined Bitcoin address whose private key is currently unknowable.
The proposal, outlined by BitMEX Research, uses a Nothing-Up-My-Sleeve Number system to create this address. If any entity spends from it, that action would serve as definitive evidence of quantum capability in the network.
To support this, the concept of a canary fund is introduced, where users could voluntarily deposit Bitcoin into the special address as a bounty. The goal is to incentivize a quantum-capable entity to claim these funds transparently rather than attacking other holdings.
However, the researchers acknowledge this approach carries risks, such as the bounty being too small to attract disclosure. They also note a reputable organization might prefer to claim the canary bounty openly.
Alongside this, a “safety window” concept is being explored, where transactions could still be processed but with outputs temporarily locked. This lockup period could be as long as 50,000 blocks, or roughly one year.
