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Paradigm proposed a way to protect "sleeping" BTC from quantum attacks without transferring coins
Paradigm researcher Dan Robinson introduced the Provable Address-Control Timestamps (PACT) mechanism, which allows owners to prove control over a Bitcoin address in advance using a timestamp in the blockchain, without moving funds or revealing unnecessary activity. In the event of a quantum attack, this proof can be disclosed and BTC can be transferred to a quantum-resistant version of the network, whereas alternatives like BIP-361 suggest a migration window and subsequent deactivation of outdated signatures. BIP-361 authors warn that more than a third of BTC is vulnerable due to exposed public keys, and "Q-Day" estimates range from several years to decades, with Google citing 2029 as a target for transitioning to post-quantum cryptography.