New PACT Proposal Could Safeguard Early Bitcoin Holders from Quantum Threat

A recent proposal called PACTs aims to help early Bitcoin holders protect themselves against potential quantum threats without revealing their identity. According to Dan Robinson, a researcher at Paradigm, this concept relies on cryptographic proofs that can be stored privately and used in the future to regain access to funds.

The idea of PACTs involves creating a cryptographic proof showing control over a private key, which is then timestamped using Bitcoin's existing infrastructure. This proof remains private and unused unless it becomes necessary in the future. If Bitcoin shifts to quantum-resistant rules, these stored proofs could become a lifeline for users to regain access to their funds.

Existing proposals, such as BIP-361, rely on public action or compromise privacy, but PACTs offer a different route by focusing on the knowledge of the private key itself. While this approach provides flexibility and privacy, it also depends on trust in the future and potential protocol changes.