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v3.1.4

v3.1.4: fix: COSE cross-verifier compatibility and spec-correct assertion labels
@erik-sv erik-sv tagged this 22 Apr 00:36 
- Convert ECDSA signatures between DER and raw R||S per RFC 9053
- Unwrap CBOR tag 18 in COSE_Sign1 parsing per RFC 9052
- Handle detached-payload COSE_Sign1 x5chain extraction
- Handle single-cert x5chain as bstr (not array) per RFC 9360
- Use spec-correct c2pa.soft-binding label (was c2pa.soft_binding.v1)
- Bump version to 3.1.4
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