October 14th 2026, 6:03 PM
Coinbase Prepares for Quantum Bitcoin Era
Key Summary
Coinbase, a major Bitcoin custodian, has outlined its post-quantum needs for Bitcoin custody, emphasizing the importance of a new digital signature scheme, block space, and compatibility with custodians and everyday wallets. The company is preparing its systems, backing open-source work, and evaluating hybrid arrangements to ensure a smooth transition.
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Background
Coinbase, the custodian holding about 5% of all BTC, published a technical blog on October 13 outlining its post-quantum needs for Bitcoin custody.Technical Considerations
The company's central point is that choosing a new digital signature scheme is only one piece of the job, since any plan also has to fit Bitcoin's scarce block space and work for custodians and everyday wallets.Evaluation Criteria
Coinbase raised particular concerns about stateful post-quantum signatures, which can be smaller and faster than stateless alternatives but may make forgery possible.Hybrid Arrangements
The company proposed evaluating hybrid arrangements in which a wallet could spend funds through either a conventional ECDSA/Schnorr signature or a post-quantum key during the transition.Freeze Proposals and Exposure Estimates
Wallets that migrate late are the last open item. If Bitcoin eventually limits or ends ECDSA and Schnorr spending, Coinbase wondered whether and how those users could move funds afterward.#Bitcoin#PostQuantum#SEC