Verify a Typogram

Drop a Typogram (an .svg or .html file) to check it here, in your browser. Nothing is uploaded — the file never leaves your device. The check recomputes the work's identity hash and verifies the issuer's Ed25519 signature.

Drop a Typogram here, or click to choose a file.

SVG or HTML. For a PDF, use tg verify on the command line.

What this does. A Typogram carries, in one file, both the picture and its complete machine-readable text, plus a provenance record. This page reads the picture's text, computes its SHA-256 identity hash, and checks the hash and the issuer's Ed25519 signature against the issuer's published key (/.well-known/tgart-keys.json). Result: VERIFIED (from that issuer, unchanged), UNSIGNED (consistent, but not signed) or TAMPERED.

This browser check covers Typograms from this site and any browser with Ed25519 in Web Crypto. The full check — including PDFs, other issuers and the key-statement chain — is the tg verify command. Spec: verification.md and issuers.md.

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