Attestation
Ed25519-signed record freezing a dated business fact — a batch genealogy, a HACCP reading, a carbon footprint, a recall. It carries the hash of a canonical payload, the reference of its signer, and its anchoring state. About forty types exist, from `genealogy` to `haccp_ccp`.
Related notions
Equivalents elsewhere
- Close to Wikidata
What the blog says
- No One Will Read the Label
Herbert Simon, bounded rationality: four seconds facing thirty options. The label is a rational shortcut — but it still has to be decompressible.
- Why Labels No Longer Convince Anyone
Michael Spence (Nobel 2001), costly signaling, and what separates proof from a promise: why a label anyone can slap on no longer signals anything — and how proof changes the game.
- A Proof Is Not a Fact. It Is a Path.
What makes a proof is neither sincerity nor precision, but continuity: a chain of transformations in which every link remains reversible.
- A Tonne Is Not a Tonne
Origin or path? From the local-versus-commodity duel to the carbon credit: why a tonne is worth what its place is worth, and what an index changes about a credit.
- Signer, relier, publier
Un système de preuve fait trois choses distinctes. Pourquoi la signature vient d’abord, pourquoi relier fait le vrai travail, et à quel moment une chaîne devient nécessaire.
- Three Ways of Knowing a Tomato
Sign, reason, singular: Spinoza’s three kinds of knowledge applied to a tomato — from the label to the verifiable product passport.
- The Stamp and the Thing
Ceremony or substance: with Spinoza, why a declaration of conformity is a rite — and how proof finally shows what the standard truly wants.
- EUDR: what the anti-deforestation regulation changes for producers
Regulation (EU) 2023/1115: products covered (cocoa, coffee, wood, soy, palm oil, cattle, rubber), DDS obligations, geolocation, 2025 timeline, penalties of up to 4% of European turnover.
- Four Hundred Thousand Sensors That Did Not Exist
eFishery reported 400,000 connected feeders at the edge of its ponds. There were 24,000. What its collapse says to anyone who sells traceability.
Where it is implemented
lib/onchain-anchor.ts