Soundness deployed the only post-quantum signature migration strategy that scores YES on all four properties in Coinbase's Independent Advisory Board report. The approach uses zero-knowledge proofs of seed knowledge to enable quantum-safe wallets without address changes, asset migration, or hard forks.
Coinbase's Independent Advisory Board on Quantum Computing and Blockchain published its first position paper evaluating strategies for migrating blockchain signatures to post-quantum security across Bitcoin, Ethereum, Solana, Algorand, Sui, and Aptos. Soundness' Strategy 1, which generates private keys as hash outputs using zero-knowledge proofs of seed knowledge, is the only deployed example cited in the report and the only strategy scoring YES on all four evaluation properties: no current security weakening, post-quantum security, no significant cost today, and minimal blockchain changes. After eight months of optimization, Soundness reduced proof sizes from 5.4 MB to roughly 50 KB using WHIR-based proving systems, enabling both per-transaction and account-level deployment models. The platform now supports five wallets across five networks including Stellar, with further work underway for Bitcoin, native chain support, and threshold/HSM extensions.
