Circle Advances Blockchain Arc with Quantum Resistance, "Q-Day" May Arrive Before 2030

Odaily Stablecoin issuer Circle stated that its upcoming Layer 1 network, Arc, will have quantum resistance as a core design goal, emphasizing that long-term cryptographic security has become a "baseline requirement" for financial infrastructure. "Q-Day" (the tipping point when quantum computing can break public-key cryptography) may arrive before 2030, or even sooner. Meanwhile, attackers have already begun collecting data in advance, waiting to decrypt it once quantum computing matures, indicating that potential risks are already emerging ahead of time.

The Arc testnet launched in October 2025, with the mainnet expected to go live within the year. At launch, it will support quantum-resistant signature schemes, allowing users to create quantum-resistant wallets (non-mandatory). Subsequently, it will expand to include transaction privacy protection, involving the encryption of balances, recipients, and transaction data.

In the long term, Arc also plans to introduce quantum-resistant mechanisms at the validator node authentication and network infrastructure levels to build a comprehensive protection system. Circle stated that Arc aims to provide developers and institutions with a practical path for a smooth transition to the post-quantum era, rather than remaining at a theoretical level. (The Block)