Tokenized data assets, priced by machine audit.
Each vault is an ERC-721 holding the sha256 of a dataset and a quality report written by an appraiser that read every row. Schema, completeness, duplicates, ordering, outliers. Fail the audit and the contract refuses the sale — not a low score, refused.
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Buy a licence by calling buyLicense(vaultId) on the contract with the exact price. The licence is time-boxed and recorded onchain against your address. To collect the data, this page asks you to sign a one-time challenge; the server recovers your address from that signature and asks the contract hasAccess(vaultId, address). No account, no API key, nothing to leak. The file it returns hashes to exactly the value the vault committed to — verify it yourself with shasum -a 256.
The appraiser is a single service holding APPRAISER_ROLE. The path out is a challenge mechanism: stake-backed re-appraisals that slash on divergence. Delivery is a licensed download verified by content hash, so privacy-sensitive datasets are out of scope until compute-to-data exists. Saying so here rather than in a footnote is deliberate.