Institutions that have made big money in the crypto space really should start doing some real work.

Circle pushes blockchain Arc against quantum attacks, and a “Q-Day” may arrive before 2030
Stablecoin issuer Circle said that its upcoming Layer1 network Arc will be designed with quantum-resistant capabilities as the core goal, and emphasized that long-term cryptographic security has become a “baseline requirement” for financial infrastructure. “Q-Day” (the critical point at which quantum computing can crack public-key encryption) may arrive before 2030, or even earlier. At the same time, attackers have already begun collecting data in advance, planning to decrypt once quantum computing matures, and potential risks have already started to show up.
The Arc testnet went live in October 2025, and the mainnet is expected to be launched within the year. In the initial launch stage, it will support quantum-resistant signature schemes, allowing users to create quantum-resistant wallets (not mandatory). It will later be expanded to include transaction privacy protection, including encrypted handling of balances, recipient information, and transaction data.
In the long run, Arc also plans to introduce quantum-resistant mechanisms at the validator node authentication and network infrastructure layers, building a complete protection system. Circle said that Arc is intended to provide developers and institutions with a practical path to smoothly transition into the post-quantum era, rather than staying at the theoretical level. (The Block)$ETH
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