Hard binding
Definition
A content binding that stores SHA hashes of specific byte ranges of the media file inside the signed manifest. Any modification to those bytes produces a hash mismatch that is detectable during verification. Hard bindings break if the file is re-encoded or format-converted.
Related terms
- Assertion
- A single provenance statement inside a C2PA claim. Examples include the camera make and model, GPS coordinates at capture, an AI-training or...
- C2PA manifest
- The structured provenance record embedded in or associated with a media file. Contains one or more signed claim blocks, each holding a...
- C2PA trust list
- A curated list of trusted root certificate authorities whose chains can anchor a C2PA claim signature. Maintained by the C2PA organisation. A...
- Claim signature
- An X.509-based digital signature over the hashes of all assertions in a claim plus the content binding hash. Produced by the signer's...
- Soft binding
- A content binding using a perceptual fingerprint or watermark embedded in the signal rather than the file bytes. Designed to survive format...
Explained in
- C2PA and Content Credentials: Cryptographic Provenance StandardsA content binding that stores SHA hashes of specific byte ranges of the media file inside the signed manifest. Any modification to those bytes produces a hash...