Keep pulling the thread on Tim Ruffing.
A cryptographically relevant quantum computer (CRQC) can calculate a private key from a public key, posing a theft risk for cryptocurrencies like Bitcoin.
Experts in quantum computing, along with the NSA and other government agencies, believe the transition to post-quantum cryptography needs to be completed within approximately the next decade.
A formal proof published by Tim Ruffing confirms that the fallback mechanism in Bitcoin's Taproot upgrade, designed for secondary public key commitments, is quantum-secure.
The cryptographic process used to derive private keys from a wallet's seed phrase is considered secure against attacks from a quantum computer.
A quantum-secure zero-knowledge (ZK) proof can be used to prove ownership of a seed phrase, allowing users of un-upgraded wallets to claim their Bitcoin after a quantum transition.
Millions of Bitcoin, particularly those from early miners that have not moved since 2010-2011, are vulnerable to theft by a cryptographically relevant quantum computer.
The speaker predicts that if there is a clear market consensus on the arrival timeline of a CRQC, the market will favor a version of Bitcoin that freezes or 'burns' all quantum-vulnerable coins.
The speaker predicts the market will strongly prefer a Bitcoin fork that freezes vulnerable coins over an alternative that would allow a glut of 1 to 2 million additional Bitcoin to be sold on the market.
The Bitcoin protocol historically requires many years to implement and adopt major transitions or new features.
Current post-quantum cryptography (PQC) schemes are generally slower, produce larger signatures, and lack support for many features used by modern crypto wallets compared to existing cryptographic standards.
Claiming Bitcoin funds using a zero-knowledge proof of a seed phrase post-quantum transition would likely result in transaction fees 10 to 100 times larger than normal.
Contentious decisions in cryptocurrencies, such as the SegWit2x fork for Bitcoin, are ultimately resolved by market forces through futures or live trading of the competing assets.