A timestamp is a mechanism that allows to prove the integrity of a series of data. That means it demonstrates that this data existed in a specific moment, and has not been altered since then.
The integrity is precisely one of the requirements that allows for a signature process to be secure and to have full legal guarantees for all parties. In this post we explain the importance of integrity in an electronic signature process, and how to achieve it thanks to a timestamp.
This post is also available in Spanish.