New Proposal Offers Solution for Bitcoin's Quantum Computing Conundrum

The issue of quantum computing has long plagued Bitcoin, with a significant portion of the cryptocurrency's supply potentially at risk. Approximately 1.1 million bitcoin, valued at around $84 billion and attributed to the cryptocurrency's pseudonymous creator Satoshi Nakamoto, could be vulnerable to theft if sufficiently powerful quantum computers are developed. This has led to discussions about implementing a soft fork that would gradually phase out the use of legacy address types, forcing holders to transition to quantum-resistant formats before attackers can exploit their private keys. However, this approach poses a dilemma for long-dormant holders like Satoshi, who would need to publicly move their assets to avoid losing access. In response, Dan Robinson of Paradigm has proposed a solution called Provable Address-Control Timestamps, or PACTs, which allows holders to timestamp proof of ownership without revealing any information publicly until they need to spend their assets. This approach involves generating a random salt and using it to create a cryptographic commitment, which is then timestamped and stored privately. If a soft fork is implemented that freezes quantum-vulnerable coins, the protocol could include a rescue path that accepts a zero-knowledge proof, demonstrating that the holder created their commitment before the existence of quantum hardware. While this solution offers a potential way forward, it requires the eventual adoption of a STARK verification protocol, which would necessitate a separate soft fork and broad community consensus. Furthermore, the protocol's effectiveness relies on the holder creating the commitment, meaning that if Satoshi is no longer active, the coins would remain exposed to the risks of quantum theft or community freeze.