Coinbase urges Bitcoin to begin quantum migration now

What happened

Coinbase has issued a detailed position paper calling for Bitcoin to begin preparations for post-quantum security now, well before quantum computers threaten the network's current cryptography. The exchange, which holds approximately 5% of all existing BTC in custody for clients including banks, asset managers, and hedge funds, argues that waiting for a confirmed quantum threat would leave insufficient time for an orderly transition. Bitcoin transactions rely on ECDSA and Schnorr digital signature schemes, which remain secure against today's computing systems but could be vulnerable to a sufficiently capable quantum computer.

Coinbase outlined seven technical priorities for Bitcoin's quantum future in its position paper. The core proposal centers on flexible output design that separates the output container from the signature scheme, allowing new post-quantum algorithms to be added or replaced without a full protocol redesign. The exchange points to BIP-360 and P2TRv2 as constructions worth building on. For active wallets, Coinbase favors a staged hybrid approach where funds could be spent using either a classical ECDSA key or a post-quantum key, enabling gradual migration before any final policy on legacy signatures is settled.

The proposal also addresses institutional custody requirements. Coinbase stresses that at least one post-quantum scheme must be compatible with multi-party computation, citing engineering work it is conducting for approximately $250 billion in institutional assets. The exchange calls for a Bitcoin-specific evaluation process for signature schemes, noting that standard TLS or PKI rankings do not account for Bitcoin's block-space constraints and long-lived, globally verified signatures.

Why it matters

Bitcoin's decentralized structure means that consensus changes require broad coordination across the network, while wallets, custodians, and other services also need time to implement and test new security measures. Starting preparation now creates room to evaluate designs and upgrade infrastructure without waiting for an emergency. The migration work is described as challenging, complex, and multi-year, making early action essential to avoid a forced rush if quantum computing advances faster than expected.

Industry momentum is building around quantum risk. Coinbase co-founded the Bitcoin Security Consortium in July 2026 alongside BlackRock, Strategy, and ARK Invest, pledging funding for open-source quantum security research. Regulators have amplified urgency on the issue. The EU flagged post-quantum migration as a systemic risk for crypto in late September, while Europol warned that wallets represent the primary vulnerability and urged exchanges and developers to begin work immediately.

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