Quantum Computing Threatens $84 Billion in Bitcoin: PACTs Proposed as Solution

• •1.72 million Bitcoin, worth $84 billion, are at risk from quantum computing vulnerabilities.
• •Dan Robinson's PACTs proposal allows private proof of ownership without moving coins.
• •The Bitcoin community is divided on whether to implement a sunset soft fork to protect vulnerable addresses.

The Bitcoin community faces a significant threat from quantum computing, which could compromise the security of approximately 1.72 million Bitcoin, valued at $84 billion, stored in older address formats vulnerable to quantum attacks. Paradigm researcher Dan Robinson proposed Provable Address-Control Timestamps (PACTs) on May 1, 2026, as a method for dormant Bitcoin holders, including those believed to belong to Satoshi Nakamoto, to privately prove ownership of their coins without revealing their activity. This proposal aims to address the dilemma of whether to implement a controversial sunset soft fork that would freeze vulnerable addresses, forcing holders to publicly move their coins. PACTs utilize existing Bitcoin tools to create a private record of ownership, allowing users to secure their assets against potential quantum threats. The proposal has garnered attention but also highlights the risks of not implementing a quantum-proof solution in time. The urgency of the situation is compounded by the possibility that cryptographically relevant quantum computers (CRQCs) may arrive sooner than anticipated, potentially leading to significant financial losses.