RippleX software engineer Mayukha Vadari revealed a significant development in $XRP Ledger's formal verification in a recent X post, noting that the same technology that recently allowed Claude to formalize Fermat's Last Theorem is being used to verify the $XRP Ledger.
Vadari revealed a collaboration with CommonPrefix to prove mathematically that $XRP Ledger's most critical parts do exactly what is expected. This post caught the attention of the $XRP community, including Ripple CTO emeritus David Schwartz.
An original architect of the $XRP Ledger, Schwartz responded that he had "discovered a fantastic proof of the formal validity of XRPL's consensus algorithm." Formal verification uses machine-checked mathematical proofs to show that software satisfies its specification for every possible input. Where a test suite can only check correctness on the inputs it actually runs, a proof covers the entire input space.
I have discovered a fantastic proof of the formal validity of XRPL's consensus algorithm, but X's post length limitations make posts too small to contain it.
— David 'JoelKatz' Schwartz (@JoelKatz) September 8, 2026
Schwartz cited an unusual limitation to his claim: "X's post length limitations make posts too small to contain it."
The context of Schwartz's post remains unknown; it may have been intended as a playful acknowledgment of an advanced formal verification technique used by the XRPL, or it may point to a potentially significant development in the mathematical verification of the $XRP Ledger's consensus algorithm, as he did not provide any additional clues.
Schwartz transitioned to the role of Ripple CTO Emeritus last year after stepping back from day-to-day activities as the Ripple CTO. However, he remains deeply involved with $XRP, running his own hub and using data from it to improve the XRPL. The observations from his hub contributed to the release of $XRP Ledger 3.2.1, which fixed the manifest flood observed on the XRPL at the close of July.
$XRP Ledger news #
Permission Delegation on the $XRP Ledger has passed an independent security review by Cantina Security and the XRPL quality assurance test suite. All findings were fixed in v1.1 and verified by Cantina, and the QA team found no regressions across 5,088 tests.
Reacting to this milestone, Ripple head of engineering JA Akinyele said getting delegation right at the protocol layer required a very high security bar because it touches core transaction processing behavior.