A digitally signed assertion by a trusted authority that a specific digital object existed at a particular time.
(NIST SP 800-32)
NIST SP 800-32 under Trusted Timestamp
A timestamp that has been signed by a TTA.
NIST SP 800-102 under Trusted timestamp
A timestamp that has been signed by a Trusted Timestamp Authority.
NIST SP 800-89 under Trusted timestamp