Coinbase pushes early planning for Bitcoin's quantum-resistant future
Coinbase published an October 13 document arguing that Bitcoin should prepare for quantum computers before they become an immediate danger. The exchange said changing consensus rules and migrating the ecosystem would take several years, and noted it holds nearly 1 million BTC, about 5% of existing supply. It outlined possible technical paths such as P2MR, BIP-360, hybrid spending, and post-quantum algorithms, while warning that up to 6.9 million BTC could be exposed through revealed public keys.
Coinbase's Oct. 13 paper frames quantum readiness as a multi-year engineering and governance task, not an emergency response. It says protocol rule changes and ecosystem migration require long lead times, and notes the company holds almost one million BTC, roughly 5% of circulating supply.
The document surveys options including P2MR/BIP-360, P2TRv2, hybrid spending, and algorithms such as ML-DSA, SLH-DSA, FN-DSA, and SHRINCS. It also cites estimates that as many as 6.9 million BTC may be vulnerable where public keys are already visible, including 1.7 million in older P2PK outputs.
If quantum risks materialize, Bitcoin holders, exchanges, custodians, and developers may face pressure to migrate funds and update software. Coins with already-visible public keys could be especially affected, potentially influencing market confidence and custody practices. A gradual, coordinated transition could reduce disruption, but disagreements over protocol changes may slow adoption. The outcome may shape how everyday users and institutions view Bitcoin's long-term security, without necessarily changing its use today.