Quantum computing is closer than most people think[1][2][3]. Bitcoin isn’t ready[4][8].
Today, we're releasing a practical fallback: yellowpages. yellowpages is a cryptographic registry designed to help Bitcoin holders prove ownership in a post-quantum world.
Bitcoin’s cryptography relies on elliptic curve signatures (ECDSA & Schnorr), which quantum computers will break[5]. When cryptographically relevant quantum computers arrive, private keys currently protecting Bitcoin can be derived from their public keys, compromising asset ownership and effectively enabling theft of Bitcoin. The first signs of quantum attacks might go unnoticed – a subtle draining of dormant wallets, quietly recovered coins, or isolated incidents mistaken for hacks or errors[6]. If we wait until quantum attacks are publicly known, it'll already be too late. Trust in the ledger - and Bitcoin - will be decimated.
Institutions and individual holders need assurance today that their Bitcoin will survive the quantum era. While the Bitcoin protocol upgrading to quantum-resistant cryptography will ultimately be necessary, the network’s governance and development is historically slow. Past upgrades like SegWit and Taproot took years longer than expected, and contentious forks have shown that achieving consensus is complex and slow-moving. Quantum threats won’t wait for Bitcoin’s governance to catch up, in which case, ownership will be compromised.
yellowpages addresses this urgent need proactively, creating a secure link between your current Bitcoin keys and new quantum-resistant keys. Here's how it works:
- You generate a set of quantum-resistant key pairs[7].
- You create a cryptographic proof linking your existing Bitcoin address to these new quantum-resistant addresses – without exposing sensitive information.
- Your proof is securely timestamped and registered in our publicly verifiable registry.
This proactive approach ensures that even if Bitcoin itself isn’t upgraded in time, you have a clear, provable record of ownership post “Q-Day”. You won’t have to move your coins on-chain or rely on uncertain protocol upgrades. Instead, you'll have a trusted, independently verifiable backup that can help facilitate a smooth migration (think seeding a new chain, claiming rightful ownership on a post-quantum fork. etc.) when the quantum threat materializes.
We built yellowpages because proactive migration matters. Acting now prevents chaos and uncertainty later, protecting the integrity of Bitcoin holdings and ensuring continued trust in the digital asset ecosystem. It provides assurances to holders, whilst allowing time for essential protocol upgrades to be proposed, debated, developed, and tested.
With yellowpages, Bitcoin holders can now confidently prepare for a quantum-secure future. No hype, no FUD, just clear, immediate security. Oh yeah, it’s also free, audited, and open source.
Find yourself in the post quantum world - join the yellowpages.
*no, there is no token!
[1]: https://blog.google/technology/research/google-willow-quantum-chip/
[2]: https://arxiv.org/abs/2505.15917
[3]: https://blog.projecteleven.com/posts/quantum-earthquakes-crypto-foundations
[4]: https://www.projecteleven.com/btc-at-risk
[5]: https://arxiv.org/abs/quant-ph/9508027
[6]: https://blog.projecteleven.com/posts/quantum-wargames
[8]: https://blog.projecteleven.com/posts/quantum-vulnerability-of-bitcoin-addresses