What are common ARC validation failures?
- Incorrect or skipped instance numbers.
- Bad or missing ARC Seals.
- Modified ARC Authentication Results.
- Signature mismatches.
- Untrusted ARC signer domains.
- Expired or incorrect cryptographic keys.
- Broken sealing chains where AS does not match earlier signatures.
These failures break trust in the message’s forwarding path and often result in a Chain Validation status of cv=fail.
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