Circle outlines Arc blockchain’s quantum-resistant roadmap in response to looming cryptographic threats

Circle, the company behind USD Coin (USDC), has released a new blog post detailing the roadmap for its Layer 1 blockchain, Arc, with a strong emphasis on quantum resistance. In the publication, the company underscores that institutions in the crypto sector need to take post-quantum encryption standards seriously, even though quantum technology isn’t yet in mainstream use. Circle warns that the era when quantum computers can compromise public-key cryptography could arrive as soon as 2030, or possibly earlier. Notably, similar warnings have also appeared in a recent blog post from Google, which suggested that Bitcoin may be at risk sooner than many previously believed.

Circle warns industry on quantum risks

Circle emphasized that the underlying risk of quantum attacks has already begun to materialize, despite quantum technology not yet being widely deployed. The company points out that malicious actors could be harvesting encrypted data today, with plans to decrypt it once sufficiently powerful quantum computers become available in the future. According to the company, this looming threat makes long-term cryptographic resilience a necessity for banks, fintech firms, stablecoin issuers, and platforms engaged in asset tokenization.

In a public statement, Circle emphasized, “Circle is taking active measures against these risks. Providing long-term encryption for banks, fintech companies, other stablecoin providers, and global enterprises has become a foundation for today’s infrastructure decisions.”

Circle’s roadmap also highlights that migrating Bitcoin’s UTXOs (unspent transaction outputs) to post-quantum wallets could take months even under optimal conditions. If organizations delay this migration and find themselves forced to rush as quantum threats become imminent, the risks could increase substantially.

Arc blockchain’s technical approach and planned developments

Circle has signaled that its newly developed and Ethereum Virtual Machine (EVM)-compatible network will support quantum-resistant features from the outset. The company further noted that it is working diligently on a comprehensive plan to ensure Arc’s entire infrastructure is future-proofed against the potential dangers posed by quantum computing. The Arc public testnet was launched in October 2025, and the mainnet release is scheduled for later this year.

Once the mainnet goes live, Arc will introduce an advanced signature infrastructure enabling users to create wallets that are secure against quantum attacks. The company clarified that opting into this quantum-resistant feature will remain a user-driven choice rather than a mandatory requirement.

Circle has also announced that the wider network ecosystem will be upgraded for quantum resilience in the future, including updates to validator authentication processes aimed at preventing quantum-driven attacks.

Arc is designed to enable both developers and institutional users to smoothly transition to a post-quantum era without causing significant fragmentation or downtime within the network. This approach, Circle believes, will help maintain both operational continuity and security during the shift.

In their announcement, Circle stated, “Quantum resilience should not be confined to academic papers, pilot projects, or vague roadmaps for the distant future. These features need to be woven into real-world infrastructure. Arc’s mission is to deliver a practical, robust, and adaptable blockchain framework.”