Attesté Certificates
Every artwork on Attesté can be attested publicly. Each Attesté Certificate is a cryptographically-secured record of provenance, viewable by anyone with the link. Galleries, auction houses, insurers, and researchers can cite these URLs as the canonical record. Below are three demonstration certificates illustrating the format. Real public certificates appear here as collectors opt in.
Demonstration Certificates
How Attesté Certificates Work
When a collector opts in, Attesté serialises the artwork's complete provenance record — title, artist, dimensions, medium, provenance chain, valuations, and condition reports — into a canonical JSON document and computes its SHA-256 fingerprint. The first 16 characters of the hash become the page URL. The full 64-character hash is displayed on the certificate and can be independently verified in your browser using the Web Crypto API.
Any change to the underlying record — even a single character — produces a different hash, making tampering immediately detectable. The certificates are hosted as static HTML on Netlify's edge CDN and permanently indexed by search engines.
- SHA-256 cryptographic integrity
- Client-side browser verification
- Permanent, edge-cached URLs
- Schema.org VisualArtwork JSON-LD
- Full provenance chain timeline
- Valuation & condition records
- Art-historical context paragraph
- Pseudonymous collector privacy
What certificates do not prove: Attesté asserts that the owner reported these facts and that the hash chain is intact. Physical authenticity, attribution, and forgery detection require specialist art-historical and scientific analysis. Always consult a qualified conservator or auction house specialist for authenticity opinions.