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    Metadata Embedding

    The Seal

    Stamp a file so its accession number, creator, rights, and content hash travel inside the file itself — images through XMP/IPTC space, audio through ID3 tags, everything through a signed manifest. The media payload is never re-rendered; only the reserved header space is written. Change one byte afterward and the hash no longer matches.

    File

    Choose the file

    Drop a JPEG, PNG, or MP3 — or any file for a manifest seal.

    JPEG → XMP · PNG → tEXt chunks · MP3 → ID3v2.3 · other → manifest sidecar

    Record

    The accession block

    Standard

    The rules of the seal

    • The media payload is never re-rendered — only header/metadata space is rewritten.
    • The SHA-256 is taken from the sealed file. Change one byte and the hash no longer matches.
    • The accession number travels with the file wherever it is shared.
    • Formats without a writer yet are sealed by manifest — the JSON is the proof of record.