Sigillo gives trusted sources — libraries, newsrooms, archives, museums — a cryptographic way to authenticate their content. Anyone on the internet can verify it, instantly, without permission.
Pick a scenario, upload a file, or paste a URL. Results in under a second.
Each institution publishes a small identity file at its own domain — e.g. nypl.org/.well-known/did.json. No registry. The domain is the identity.
For every item they publish, they sign a small attestation: "this content hash is ours." Ed25519, W3C Verifiable Credentials. Millions of items in minutes.
Any reader, anywhere, resolves the identity file and checks the math. Green, grey, or red — in one HTTPS round trip. Works offline after first fetch.