Retain an Asset as digitisation Evidence

Copies the bytes of one of your uploaded Assets into evidence you own: it outlives the Asset’s expiry and is erased only with your account’s data. The evidence records the upload’s digest, the digest of the bytes it measures, its dimensions and the colour contract version it was retained under. Retention is content-addressed, so the same image again answers the same evidence: 201 the first time, 200 after, and a retry needs no Idempotency-Key. Another account’s Asset, and an expired or unknown one, answer 404 ASSET_NOT_FOUND; an Asset that is not an intact upload of yours, such as a job result, answers 409 EVIDENCE_SOURCE_UNUSABLE. Requires the digitisation.write scope, which your account operator provisions; served only where digitisation is enabled for your environment.