The Sui Foundation reportedly announced plans on August 6 to add two NIST-standard post-quantum signature schemes to its blockchain, with a testnet launch targeted for the end of 2026 and a mainnet rollout in the first quarter of 2027. As of August 7, no matching announcement had appeared on the foundation's official press center, blog, or press listings.
What the reported plan includes
According to the report, Sui would adopt ML-DSA-65 for everyday accounts and SLH-DSA-SHA2-128s for high-value vaults. The two schemes are both standardized by the U.S. National Institute of Standards and Technology, a detail that could matter for institutions weighing long-term quantum threat risks.
The timeline calls for a testnet launch by the end of 2026 and a mainnet target in Q1 2027. That's a roughly 16-month runway before the first phase goes live.
Why NIST standards matter
The choice of NIST-standard schemes is notable. Enterprises focused on quantum threat risk management often look for cryptographic algorithms with formal government backing. Using NIST-approved signatures could make Sui's approach more acceptable to those organizations, especially those handling assets meant to stay secure for decades.
The report does not specify which NIST versions or exact parameter sets Sui would use beyond the scheme names. That leaves room for interpretation.
Impact on wallets, custodians, and tooling
If the plan moves forward, wallets, custodians, and tooling providers would eventually need to add support for the new signature schemes. The report suggests higher-assurance flows would be reserved for SLH-DSA-SHA2-128s, meaning the two schemes would serve different purposes rather than being interchangeable.
That split could create extra work for developers. They'd need to handle both signature types, decide which accounts get which scheme, and manage the user experience around key management.
Open questions remain
The report leaves several questions unanswered. Implementation details are vague. Migration paths from existing signature schemes are not spelled out. Performance trade-offs between ML-DSA-65 and SLH-DSA-SHA2-128s aren't quantified. And backward compatibility with the current Sui network is unclear.
Until the foundation confirms the plan or publishes technical specifications, the exact shape of the upgrade stays uncertain. The reported testnet date of end-2026 gives the ecosystem time to prepare, but only if the timeline holds.
