Hey everyone, RocketSquirrel here. I am building x509Lab , a browser-based GUI tool for visualizing and testing X.509 certificate chains.

In the previous versions, clicking the 'Verify Chain' button was a bit frustrating. If your chain was broken, it would just throw a generic ❌ Signature FAIL message. It didn't tell you which certificate failed, or why .

I spent this weekend fixing that.

Granular Verification & Actionable Hints

The verification engine now breaks down the chain check into 8 distinct cryptographic and structural validations (Validity, CA Flags, DN Matching, Signatures, Path Length, Key Usage, etc.).

If a check fails, the UI now points to the exact certificate and gives you a hint on how to fix it.

Scenario: Expired Certificate ❌ [Intermediate CA] Validity Period FAIL 💡 This certificate expired 365 days ago.…