- Coinbase’s quantum advisory council warns that proof-of-stake chains like Ethereum and Solana face specific vulnerabilities in their validator signature schemes.
- Wallet signatures proving crypto ownership are a major long-term risk, with an estimated 6.9 million Bitcoin in wallets where public keys are visible on-chain.
- Current systems remain secure as quantum computers capable of breaking modern cryptography do not exist, but the industry must start preparing for a multi-year upgrade effort.
- Technical challenges exist as quantum-resistant signatures are much larger, potentially impacting transaction speed, storage, and costs.
Cryptocurrency exchange Coinbase released a report Tuesday from its Independent Advisory Board on Quantum Computing and Blockchain, examining how future quantum advances could threaten digital asset security. The board stressed that while customer assets are safe today, “the industry should not confuse ‘not imminent’ with ‘not important.’” according to a spokesperson.
Consequently, proof-of-stake networks built on cryptography like BLS and Ed25519 signatures face unique risks. “Proof-of-stake chains have exposure in the signature schemes that validators use to secure the network,” the advisory board said, meaning core consensus mechanisms may need redesign.
Meanwhile, the council also identified digital wallet signatures as another critical vulnerability. If broken, attackers could impersonate owners and steal funds, especially from wallets with publicly visible keys.
However, the report clarifies that current cryptocurrency systems remain secure. Quantum computers powerful enough to break modern cryptographic signatures do not yet exist and would require a major leap from today’s systems.
Consequently, the advisory board published its findings now to ground the conversation in science rather than hype. The goal is to help the industry start making practical migration decisions early for an upgrade that will take multiple years.
Experts like Blockstream CEO Adam Back warn that moving to quantum-resistant cryptography presents significant technical hurdles. He told Bloomberg that giving users time to migrate their keys to a quantum-ready format is the prudent course of action.
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