Digi-CA™ the complete Certificate Authority [CA] system
TimeStamp Authority

The TimeStamp Authority [TSA] provides digital TimeStamping network based services in compliance with RFC 3161 standard, Internet X.509 Public Key Infrastructure TimeStamp Protocol [TSP]. The TimeStamp Protocol, or TSP, is a cryptographic protocol for certifying timestamp tokens using X.509 public key certificates and public key infrastructure.

The timestamp token is the signer's assertion that a piece of electronic data existed at, or before, a particular time. TimeStamp tokens are effectively used to provide evidence data in the process of validating long-term electronic signatures applied to digital communication or payment transactions and electronic documents such as Adobe® Acrobat® PDF.