Heavymeta
Authen →
notarisation over x402 · live on Algorand mainnet
An API that signs a statement about bytes it is shown and then discards them. Agents and applications pay per call; verification is free.
Pyx →
owner-held provenance for precious metals
Photograph a holding, build its manifest, and keep an attestation anyone can check. The record is built from the photograph, so a row and its picture cannot drift apart.
What these claim
That a node holding a given key observed a given record at a given time.
Not that the thing described is genuine, not that anyone inspected it, not ownership and not authorship. A provenance record that overstates itself is worth less than none, because the first counterexample discredits every record ever issued.