New ‘PACTs’ idea could help early Bitcoin holders prepare for a quantum future
A researcher at Paradigm has put forward a new idea that could help early Bitcoin holders prepare for a future quantum threat, without touching their coins or revealing who they are. In a May 1 paper, Dan Robinson introduced “Provable Address-Control Timestamps,” or PACTs. The concept is to help prove you control your Bitcoin today, and keep that proof in reserve for a future when it might matter. Robinson described it as a possible way of “letting Bitcoin holders protect themselves” without having to publicly move their coins. At its core, PACTs are about timing. A user creates a cryptographic proof showing they control a private key. That proof is then timestamped using Bitcoin‘s existing infrastructure. After that, it stays private and unused unless the day comes when it’s needed. If Bitcoin ever shifts to quantum-resistant rules, those stored proofs could become a lifeline. Users could potentially present them through zero-knowledge methods to regain access to funds, even if older cryptography is no longer trusted. What is PACTs different route? The proposal comes as developers debate how Bitcoin should respond to advances in quantum computing. One of the leading ideas, BIP-361 from Jameson Lopp, would give users time to move their funds into safer, quantum-resistant addresses. Eventually, older