Users who fail to migrate their accounts before quantum computers become a practical threat will not automatically lose their assets under Circle’s new plan — the company proposes recovery frameworks tied to cryptographic proofs, seed phrase verification, exchange records, and even court orders if necessary.
Long road, not a quick fix
Circle, which issues the USDC stablecoin across more than 30 blockchain networks, published a post-quantum report Security worksheet On Friday it explained how it intends to prepare USDC and the upcoming Arc blockchain for an era in which current crypto standards may no longer hold up.
The plan operates in three phases: a readiness phase to identify vulnerable systems, a transition period where old and new cryptography work side by side, and a final migration that could lead to the retirement of classic signature systems entirely.
The fundamental risks are technical but significant. Most blockchains are based on elliptic curve cryptography, which is strong enough As much as a computer In theory, running Shor’s algorithm could extract private keys from public keys — a scenario Circle describes as a potential “ramp event” rather than a slow-motion threat.
Quantum computing presents long-term risks to digital infrastructure, from wallet signatures to validator integrity and more.
Circle’s Post-Quantum whitepaper explores Arc’s phased approach to resilience via:
→ US dollar
→ Smart contracts
→ Auditors
→ Infrastructure… pic.twitter.com/niZqxTnUvX-bracket (@bracket) May 29, 2026
The company was quick to add that traditional cybersecurity risks remain the most pressing concern, and that there is no set timeline for when quantum devices capable of breaking existing encryption might arrive.
The problem of the immutable contract
Arc, Circle’s upcoming blockchain, is set to launch with several protections already built in. Reports say it will support SLH-DSA signatures — a hash-based standard designed to resist quantum attacks — along with Post-quantum Encrypted communications using HPKE and X-Wing technologies.
Privacy on the network will be handled by trusted execution environments, including AWS Nitro Enclaves, which process encrypted transactions and protect balance data from outside viewing.
Upgrade existing ones US dollars Smart contracts present a more difficult challenge. Circle plans to modify the contracts that allow for upgrades so that they can accept both traditional and post-quantum signatures at the same time, allowing users to move at their own pace.
But immutable contracts are a different story — especially the widely used “ecrecover” function in Ethereum, which has been built into countless published contracts that cannot be changed. According to Circle, intervention at the protocol level may be the only path forward in this regard.
Regulatory questions are left open
The account recovery proposals are among the most forward-looking parts of the white paper. Circle also pointed to long-term risks related to the history of the blockchain itself, warning that compromised verification keys on proof-of-stake networks could be used to manipulate historical records.
To address this, the roadmap calls for validator migration, post-quantum security checkpoints, and mechanisms to validate chain history moving forward.
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