- Coinbase, which custodies roughly 5% of all Bitcoin, is urging developers to begin quantum-proofing the network now, warning that consensus changes and migration “can take years.”
- The exchange backs a flexible container design like BIP-360 and a staged “1-of-2” classical-plus-quantum spending path compatible with multi-party computation.
- Dormant, lost, and Satoshi-era coins present a separate governance challenge requiring quantum-safe rescue mechanisms.
Coinbase is pressing Bitcoin’s developers to begin preparing for the quantum-computing threat before it’s too late, laying out a detailed technical wish list in a blog post published Tuesday. The exchange, which says it custodies roughly 5% of all Bitcoin in existence, framed the shift to quantum-resistant cryptography as a complex, multi-year undertaking that needs to start now.
“Bitcoin consensus changes and ecosystem migrations can take years,” the company wrote, warning that waiting for a cryptographically relevant quantum computer would leave too little time to respond. The concern centers on how Bitcoin secures wallets: a sufficiently powerful quantum machine could, in theory, derive a private key from an exposed public key and drain the funds, a hypothetical milestone the industry calls “Q-Day.”
Consequently, Coinbase stressed that a fix involves far more than picking a new signature scheme. Any transition would need to protect both existing and newly created coins, fit Bitcoin’s limited block space, and keep working for ordinary wallets and institutional custody alike.
The post reads less like a mandate than a set of requirements from one of the network’s largest stakeholders. Coinbase backed a flexible “container” design, pointing to proposals such as BIP-360, that would let new post-quantum signature systems be swapped in over time without a full redesign.
It also floated a staged “1-of-2” construction, letting the same funds be spent with either a classical key or a quantum-safe one during the transition. The company emphasized that whatever scheme Bitcoin adopts should be compatible with multi-party computation, the key-splitting technique custodians like Coinbase rely on to guard against theft.
Meanwhile, thornier still is the question of dormant, lost, or exposed coins, including Satoshi-era holdings, which Coinbase said should be treated as a separate governance problem. It cautioned that any rescue mechanism must itself be quantum-safe, so an attacker who only knows an exposed public key couldn’t exploit it.
The push builds on Coinbase’s steady drumbeat of quantum warnings. The exchange convened a quantum advisory board in January to study the risks and joined a Bitcoin Security Consortium in July alongside BlackRock and Strategy, pledging a combined $15 million toward quantum-proofing Bitcoin.
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