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The BIP-322 signature verification does not enforce the SIGHASH value to be SIGHASH_ALL, and therefore is not strictly following the spec.
Non-compliant BIP-322 signatures in proof of possessions can be accepted by the chain.
Summary
The BIP-322 signature verification does not enforce the SIGHASH value to be SIGHASH_ALL, and therefore is not strictly following the spec.
Impact
Non-compliant BIP-322 signatures in proof of possessions can be accepted by the chain.