New PACTs proposal offers dormant Bitcoin holders a way to protect coins from future quantum computer threats.

Paradigm researcher Dan Robinson proposed Provable Address-Control Timestamps (PACTs), a method allowing dormant Bitcoin holders to silently prove control of their addresses before quantum computers can compromise their keys. This approach uses existing Bitcoin tools to create private, timestamped proofs without on-chain transactions or public disclosure. It aims to protect over 1.1 million BTC in wallets linked to Satoshi Nakamoto, worth about $75 billion, from quantum threats without forcing immediate coin migration. The proposal requires future Bitcoin protocol updates and community consensus to enable a rescue path but offers a low-cost, privacy-preserving hedge against emerging quantum risks.