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Coinbase, which currently holds around 5% of the total Bitcoin supply on behalf of banks, asset managers, and hedge funds, is urging the Bitcoin network to start preparing for potential quantum security threats. While these threats are theoretical at this point, the bigger challenge is whether Bitcoin can implement a gradual technical upgrade before any significant changes occur.
Bitcoin transactions utilize digital signatures to confirm that the spender has authority over the stated funds. At present, the network employs ECDSA and Schnorr signature protocols, which are secure against current computing capabilities.
However, a sufficiently advanced quantum computer could disrupt this security by deriving a private key from a public key, enabling an attacker to access funds that are vulnerable.
Coinbase, custodial of approximately 5% of Bitcoin, has shared insights regarding Bitcoin’s transition to a post-quantum security framework. The… — Wu Blockchain (@WuBlockchain)
A machine capable of breaking cryptographic defenses in such a manner is often referred to as a cryptographically relevant quantum computer (CRQC). A report includes a prediction from Google researchers that such technology could emerge by 2029.
The challenge of migration is fundamentally structural. Bitcoin’s decentralized architecture means that any consensus modifications require widespread coordination, and wallets, custodians, and other services will need sufficient time to adapt and test new security measures. Coinbase argues that proactive efforts should commence long before a CRQC is officially announced, rather than waiting until a crisis dictates urgency.
Timing is critical: while quantum computing has yet to demonstrate an ability to compromise Bitcoin’s signatures, the transition process could span several years. By initiating preparations now, stakeholders can explore design options and upgrade systems without facing an imminent quantum threat.
Coinbase envisions transaction outputs—the framework that determines how funds can be utilized—supporting emerging post-quantum cryptography without necessitating a complete overhaul of the Bitcoin transaction framework every time signature technologies evolve.
By adopting flexible outputs, there could be provisions for quantum-resistant signatures to be incrementally added, swapped, or blended as technologies and security assessments progress. The exchange highlights P2MR, linked with BIP-360, and P2TRv2 as examples under consideration.
Coinbase also supports a phased implementation instead of a one-time mandatory switch. A potential hybrid model could allow funds to be spent using either the traditional ECDSA or Schnorr keys alongside a post-quantum key.
This approach would enable users to transition to enhanced security before fully migrating, although Coinbase’s guidelines do not finalize the design or establish rules for phasing out older signature techniques.
It is essential to scrutinize signature schemes that require wallets to monitor state. If a wallet mismanages or loses records of previously utilized signing keys, this could lead to vulnerabilities through key reuse. As such, Coinbase advocates for stateless options to be offered alongside stateful designs, ensuring that wallet operators are not solely reliant on systems needing impeccable record-keeping.
Quality of implementation is equally important and should not be viewed as a mere detail. Coinbase emphasizes the need for consistent verification across various platforms, safeguards against timing leaks, transparency in settings, and resilience even if the random-number generator utilized in signing encounters issues.
These measures aim to mitigate the risk that a seemingly quantum-resistant update introduces exploitable software or wallet vulnerabilities. The broader security concerns around wallets further demonstrate why implementation is as crucial as the cryptographic design itself.
Institutional adoption presents additional considerations. Coinbase believes that post-quantum Bitcoin solutions should be compatible with multiparty computation (MPC), which facilitates organizations in distributing key operations without relying on a single participant or device. A design exclusively suitable for individual wallets may hinder exchanges, custodians, and large enterprises in their transition.
Concerns arise regarding the potential restriction or deprecation of ECDSA and Schnorr spending, which could leave some assets in older formats. Some dormant wallets may belong to individuals who have lost access to their keys, while certain legacy address types have exposed public keys. Coinbase alerts that a covert attacker with a CRQC might target these vulnerable assets before such capabilities are widely known.
Coinbase does not endorse a specific strategy for addressing dormant, quantum-vulnerable, or lost Bitcoin. It contends that this issue should be discussed independently to ensure that disagreements regarding these funds do not hinder the implementation of technical protections for users who are able to migrate; any rescue solutions would likewise need to be quantum-safe.
The immediate task is not to declare a single output type or signature scheme as the preferred choice. Instead, it involves evaluating versatile designs, implementation risks, and institutional compatibility, while also ensuring that the politically sensitive conversation surrounding legacy coins does not impede the commencement of broader upgrade initiatives.
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