Time stamping is used to specify a time when the digital signature is made. This is needed to properly validate the signature.
If a signature timestamp is present, then the Validation Gateway which validates the signature will check whether the certificates involved with the signature validation were valid at the moment of signing.
When a signature is performed the Validation Gateway will send a request to the Time Stamp server to put a time stamp together with the signature.
This can at a later point of time be used to prove that a document was signed at a certain time.
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