@contentauth/c2pa-js
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    SigningAlg: Lowercase<SchemaSigningAlg>

    The digital signature algorithms allowed by the C2PA spec, as accepted/produced by the core native library at the signer construction boundary.

    The native library deserializes and displays this value as lowercase here, which is distinct from the PascalCase casing it serializes into manifests (see SigningAlg from @contentauth/c2pa-types, used for SignatureInfo.alg when reading manifests). This is therefore derived from that schema type rather than being identical to it.