RFC 3161 verification: OK
Authority: http://timestamp.digicert.com
Signed time: 2026-11-11T20:16:18+00:00
Manifest SHA-256: f976a185a9fa0e772787808304eb75980415b29be144aa476a5849c39ea224f8

Status info:
Status: Granted.
Status description: unspecified
Failure info: unspecified

TST info:
Version: 1
Policy OID: 2.16.840.1.114412.7.1
Hash Algorithm: sha256
Message data:
    0000 - f9 76 a1 85 a9 fa 0e 77-27 87 80 83 04 eb 75 98   .v.....w'.....u.
    0010 - 04 15 b2 9b e1 44 aa 47-6a 58 49 c3 9e a2 24 f8   .....D.GjXI...$.
Serial number: 0xC8511839C8E9BB893919947C385E23E5
Time stamp: Nov 11 20:16:18 2026 GMT
Accuracy: unspecified
Ordering: no
Nonce: 0x409E6A7D1ADC1EE5
TSA: unspecified
Extensions:

Reproduce with OpenSSL:
openssl ts -verify -data manifest.json -in response.tsr -CAfile authority.pem -untrusted chain.pem

Verify authority.pem against the DigiCert Trusted Root G4 published certificate.
This proves existence no later than the signed time, not authorship, accuracy or original publication date.