Circle announced a phased quantum-resistant roadmap for its L1 blockchain Arc, with post-quantum signatures launching on mainnet via opt-in model to address 2030+ cryptography threats.
Tech & Launches ·
Circle rolled out a quantum-resistant development plan for Arc, its layer-one blockchain, structured in phases to address cryptographic vulnerabilities across wallets, private state, validators, and infrastructure. Post-quantum signatures will arrive on mainnet via an opt-in model, allowing users to adopt the new approach voluntarily rather than through mandatory rollout.
The announcement reflects mounting concern over quantum computing's timeline threat to current public-key cryptography systems. Circle cautioned that advances in quantum processing could compromise existing encryption by 2030 or sooner, and flagged the risk of adversaries harvesting encrypted data today to decrypt it once quantum capabilities mature—a scenario known as "harvest now, decrypt later."
The phased roadmap remains under development, with specifics on deployment timing and which system components will transition first not yet detailed in available announcements. The opt-in launch model suggests Arc will permit a parallel period where both classical and post-quantum signature schemes coexist during the transition phase.