Multiple digital signatures



I have the following case scenario: One document that needs to be sign digitaly (using an external signing service) by 4 different people. The 4 people must be present while signing the document at the same place.

How can I create a situation where "digitally speaking" is ensure that the 4 people were signing while being together?

I thought that if each one of them uses the same computer (each of them logging in the signing service) that would be a way since it is the same datamachine (same IP). Is there any others?

Thanks a lot !!

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