Circle, the issuer of USDC, has just become the first major stablecoin company to address the threat of quantum computers. It officially released a quantum-resistance roadmap for Arc, its Layer 1 blockchain.
The company warns that by 2030, powerful quantum computers could break current cryptography, putting wallets, transactions, and blockchain data at risk.
Circle’s Arc Targets Post-Quantum Security
Circle is designing Arc as a stablecoin-focused Layer 1 and building quantum protection into the network from the start.
Today, public-key cryptography protects every crypto wallet, including Bitcoin, Ethereum, and USDC. When you send a transaction, your private key creates a digital signature that proves it came from you.
The problem is that quantum computers could eventually reverse these signatures, allowing attackers to access wallets.
Security experts have also warned about “harvest now, decrypt later” attacks. This means attackers can collect encrypted data today and attempt to break it later with more powerful computers.
That’s actually Circle says Arc aims to reduce this long-term risk before the network fully scales.
Circle’s roadmap for Arc is built in four clear stages, each targeting a different layer of the blockchain:
- Phase 1 — Mainnet Launch
The first phase launches with support for post-quantum signatures, allowing users to create quantum-resistant wallets from day one. The system will be optional, letting users migrate at their own pace.
- Phase 2 — Private State Protection
After the mainnet, the second phase extends protection to private balances and confidential transactions. Circle plans to add additional encryption layers to strengthen long-term privacy.
- Phase 3 — Infrastructure Hardening
The third phase will focus on systems around the blockchain, like cloud services, access control, and data security. Protocols like TLS 1.3 already support post-quantum security, and many big tech providers are quietly upgrading their systems, following the industry shift toward post-quantum security.
- Phase 4 — Validator Hardening
The final and most complex phase targets the validators that confirm transactions. Because Arc finalizes blocks in under one second, leaving attackers only about 500 milliseconds to fake a signature.
However, post-quantum signatures require more computing power, so the team will roll out upgrades gradually.
What This Means for Bitcoin, Why Long-Term Holders Should Worry
Bitcoin has no plan for quantum resistance. Since it was built in 2009 using classical cryptography, updating the entire network would be extremely challenging. Migrating all Bitcoin wallets to post-quantum security could take months of nonstop work.
Every Bitcoin address that has sent a transaction has its public key exposed on the blockchain. When quantum computers arrive, whether around 2030 or 2035, these addresses, including Satoshi’s wallets and early miner holdings, could become targets.
All of it sits on a public ledger, waiting.
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