Drop a .tsb file below. Verification runs entirely in this
page — your file never leaves your device, and this page makes no
network requests at all. Disconnect your Wi-Fi and try it.
Drop a .tsb file here
…or click to choose one. Add an .approval.json to check a sign-off.
This is the same verifier that runs on the command line
(verifier/js/verify-core.mjs, zero dependencies) and an independent
re-implementation of the Python reference — written from the format contract, not
translated. Two checks need the engine itself and are not performed
here, so this page can never report a full pass; its best verdict is
PASS-PARTIAL and it always prints what it did not do.
Ed25519 signatures are not checked in this build, and it says so when it meets one.