Coinbase outlines post-quantum migration plan for Bitcoin, citing need for years of preparation

Coinbase published technical considerations for making Bitcoin quantum-resistant, framing them as input to open discussion rather than a final position. The custodian, which holds roughly 5% of all BTC, argues migration will be complex and multi-year, so preparation should begin before any cryptographically relevant quantum computer is announced. Coinbase favors separating output containers from signature schemes, citing P2MR (BIP-360) and P2TRv2, and suggests a 1-of-2 classical-plus-PQ spending path. It warns stateful signatures risk catastrophic forgery and urges a stateless fallback, MPC-friendliness, and a migration route for late wallets.

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