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OpenSSL command to generate and verify timestamps.

# To generate a SHA-512 timestamp request of a specific file and output to 'file.tsq':
openssl ts -query -data <path/to/file> -sha512 -out <path/to/file.tsq>

# To check the date and metadata of a specific timestamp response file:
openssl ts -reply -in <path/to/file.tsr> -text

# To verify a timestamp request file and a timestamp response file from the server with an SSL certificate file:
openssl ts -verify -in <path/to/file.tsr> -queryfile <path/to/file.tsq> -partial_chain -CAfile <path/to/cert.pem>

# To create a timestamp response for request using key and signing certificate and output it to 'file.tsr':
openssl ts -reply -queryfile <path/to/file.tsq> -inkey <path/to/tsakey.pem> -signer tsacert.pem -out <path/to/file.tsr>