Circle Unveils Quantum-Resistant Roadmap for Arc Blockchain

Circle, the issuer of the USDC stablecoin, has announced a phased roadmap to integrate quantum-resistant security features into Arc, its upcoming layer-1 blockchain, as concerns mount over potential threats from advancing quantum computing technology.

The initiative, detailed in a recent company update, begins with the introduction of optional post-quantum signature systems and wallets at Arc's mainnet launch, expected in 2026. Arc has been operating on a public testnet since October 2025, with USDC serving as the native gas token. Designed for enterprise and institutional financial applications, the blockchain aims to support secure transactions and smart contracts while prioritizing long-term cryptographic durability.

The roadmap unfolds in stages to minimize disruption. At launch, users can opt into quantum-resistant wallets, allowing them to protect assets without requiring immediate network-wide changes. Subsequent phases will extend protections to private transaction states, validator authentication, and off-chain infrastructure, including cloud environments, hardware security modules, and access controls. This approach ensures compatibility with existing systems, enabling...