CAI_Description.md

Content Authenticity Initiative

---

Example of payload using js-sdk library, using React hooks

Implementation

    const sampleImage = 'https://js-sdk.contentauthenticity.org/c2pa-samples/CAICAI.jpg';
    const imageProvenance = useProvenance(sampleImage);
    console.log(imageProvenance)

Payload shape / structure

    ImageProvenance {
        claims: Map
        activeClaim: Claim
        data: Object
        exists: boolean
    }

Example of payload

    {
        claims: [
            0: {
                key: "adobetest:urn:uuid:2d226f83-2c4f-4adb-8aa6-455cdd740e13",
                value: {
                    assertions: Map // huuuugeee,
                    asset: {
                        document_id: "xmp:iid:c2375873-049e-40af-bf01-04c50c8da83f",
                        format: "image/jpeg",
                        instance_id: "xmp:iid:c2375873-049e-40af-bf01-04c50c8da83f",
                        title: "CA.jpg",
                        thumbnail: {
                            format: "image/jpeg",
                            image: Unknown // Array of coordinates ??
                        }
                    },
                    ingredients: {
                        ...sameAsAsset
                    },
                    recorder: "C2PA Testing",
                    // I think this is the most important thing of the payload
                    signature: {
                        issuer: "Adobe, Inc.",
                        time: "2021-09-14T22:30:10.389206+00:00"
                    },
                    id: "adobetest:urn:uuid:8bc472b1-b0bb-4cf0-8936-d283bbb8b030",
                }
            }
        ],
        // there are more fields but they repeat the same fields I described above
    }

Dev notes

We are going to introduce craco for adding support for WebAssembly and Create React App