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What does it mean to easily fail to verify the campus signature?
The digital certificate is corrupted.

The reason why E-campus signature verification failed was that the digital certificate was damaged and the background could not load the relevant data, which led to the failure of E-campus background to verify the signature.

Verification means that the invoice data issued by the taxpayer is authenticated and encrypted by the tax digital certificate, and the digital certificate is uploaded to the tax authorities for verification.