Verify

Verify a session log

The point of the hash chain is that anyone can check it without trusting the host that stored it. This page is that check: paste a session log document and every rule from section 4 of the spec runs locally in your browser. Auditors and counterparties can use it on exported logs; implementers can use it while debugging a host.

session log JSON (paste, or drop a file anywhere in this box)

Verification runs the section 4 rules: contiguous sequence numbers, payload hashes over canonical JSON, chain linkage, event hash recomputation, and Ed25519 authorship signatures against the keys published in the log’s keys block. The log never leaves this page.

The verdict appears here: one card per event with its hashes, signer, and every check that passed or failed.

Try it with the published example log, a log exported from the playground, or a log your own implementation produced.