Paradigm proposes PACTs to future-proof Bitcoin ownership against quantum threats.

Paradigm researcher Dan Robinson has outlined a scheme called PACTs — Provable Address-Control Timestamps — that lets Bitcoin holders cryptographically prove control of an address using blockchain timestamps, without moving funds or triggering any on-chain transaction. The design is a pre-emptive measure: holders record proof of ownership now, before quantum computing advances far enough to crack existing private keys.

The core value is timing. If Bitcoin eventually migrates to a quantum-secure architecture, PACTs would let holders demonstrate prior control of legacy addresses and claim assets in the new system — without having to expose or move keys in the interim. It's a quiet but technically significant proposal that addresses one of the longest-running existential questions in the Bitcoin security roadmap.