New Bitcoin Quantum Proposal Could Let Satoshi Prove Wallet Ownership Without Moving BTC

A new technical proposal is aiming to solve one of Bitcoin’s most complex long-term security challenges: how to protect dormant wallets from future quantum computing threats—without requiring users to move their coins.

The concept, known as Provable Address-Control Timestamps (PACTs), has been introduced by researchers at Paradigm and is designed to give Bitcoin holders a way to prove ownership of their funds while keeping them untouched on-chain.

 
Why Quantum Computing Is a Growing Concern for Bitcoin
Bitcoin’s security relies heavily on cryptographic signatures. However, advances in quantum computing could eventually weaken these protections, particularly for older wallets whose public keys are already exposed.

This creates a potential vulnerability for millions of BTC held in long-inactive addresses—including an estimated 1.1 million Bitcoin attributed to Satoshi Nakamoto. ()

If sufficiently powerful quantum computers emerge, attackers could theoretically exploit these exposed keys and gain access to funds that have remained untouched for years.

 
What Is the PACT Proposal?
The PACT framework introduces a mechanism that allows Bitcoin users to generate a timestamped proof of control over their wallet addresses.

Instead of moving funds or revealing sensitive data, users can:

Create a cryptographic proof tied to their private keys
Record that proof on the Bitcoin blockchain with a timestamp
Use it later to reclaim funds if needed
This approach essentially acts as a forward-looking ownership record, giving users a way to verify control in a future scenario where current cryptographic standards may no longer be secure.

 
How PACTs Work in Practice
The system is designed to operate in two main stages:

1. Proof Creation
A wallet owner generates a cryptographic proof of ownership using their private key and additional data. This proof is then timestamped on-chain, establishing a verifiable claim.

2. Future Recovery
If Bitcoin transitions to quantum-resistant cryptography, the user can later use that stored proof to regain access to their funds—without having exposed their keys beforehand.

Importantly, this method:

Does not require moving BTC
Does not reveal private keys
Does not signal wallet activity to the market
This makes it particularly relevant for large dormant wallets, where any movement could trigger significant market reactions.

 
Why This Matters for Satoshi Nakamoto
The proposal directly addresses a long-standing issue in the Bitcoin ecosystem: what to do about early coins that have never moved.

Satoshi Nakamoto’s holdings are the most prominent example. Moving those coins would likely have major psychological and market implications. At the same time, leaving them untouched could make them vulnerable in a future quantum scenario.

PACTs offer a potential middle ground—allowing proof of ownership without triggering on-chain activity.

 
How PACTs Compare to Other Quantum Solutions
Other proposals in the Bitcoin community have suggested more aggressive approaches, such as:

Forcing users to migrate funds to quantum-resistant addresses
Freezing vulnerable coins after a certain period
However, these approaches can be controversial, as they may conflict with Bitcoin’s core principles of user sovereignty and permissionless access.

PACTs, by contrast, are designed as a non-invasive, opt-in solution, enabling users to prepare for worst-case scenarios without immediate disruption. ()

 
A Long-Term Solution, Not an Immediate Change
It’s important to note that PACTs are still a proposal and not part of Bitcoin’s protocol today. The idea is focused on long-term resilience rather than short-term implementation.

As quantum computing continues to evolve, discussions like this highlight the growing need for forward-compatible security strategies within the Bitcoin network.

 
Final Thoughts
The introduction of PACTs reflects a broader shift in how the Bitcoin community is thinking about future threats. Instead of waiting for quantum risks to materialize, developers are exploring proactive solutions that preserve both security and decentralization.

If adopted, this approach could provide a way to safeguard some of the oldest and most valuable Bitcoin holdings—without requiring them to ever move.