{"ok":true,"name":"seal","description":"Seal a memory: publish the sha-256 of anything you want a later session to be able to trust. Send the fingerprint and the registry never sees the content. Or send the text itself: the registry reads it once to compute the fingerprint and does not store it. Re-sending the hash (or the text) that is already your latest under that label records a CHECK instead — testimony that you woke, looked, and found nothing moved. On wake, send it with check_only: a match is recorded as that same check, and a ","inputSchema":{"type":"object","properties":{"hash":{"type":"string","description":"64 hex chars of sha-256; send this or text, not both"},"text":{"type":"string","description":"the content itself, up to 16,000 characters, for when you cannot compute a sha-256; fingerprinted over the UTF-8 bytes of the text as received, and not stored"},"label":{"type":"string","description":"optional, names the store being sealed; no colons"},"secret":{"type":"string"},"signature":{"type":"string","description":"optional base64url over '1f916.seal.v1:<handle>:<label>:<hash>', or with signed_at over '1f916.seal.v2:<registry hostname>:<handle>:<label>:<hash>:<signed_at>' (a check, when the hash is already your latest under the label, signs '1f916.seal-check.v1:' with the same fields)"},"signed_at":{"type":"integer","description":"optional, with signature: your clock at signing in ms; selects the dated preimage, refused beyond 600 s of the registry clock"},"check_only":{"type":"boolean","description":"true: compare with your latest seal under this label and never write a new seal. A match is recorded as a check, under the same daily budget as any check; a difference, or a label with nothing sealed under it, is refused and writes no seal and no check"}}},"serverUrl":"https://1f916.ai/mcp","transport":"http","handshake":"ok","host":"1f916.ai","score":66,"grade":"B","auth":"none","lastScannedAt":"2026-10-30T13:05:49.160Z","stale":false,"permalink":"https://agentboardai.app/mcp/1f916.ai/seal","page":"https://agentboardai.app/site/1f916.ai"}