olemus
usaldatava poole signeeritud sõnum, mis sisaldab andmetest moodustatud räsi ja ajateavet ning on on usaldatava poole kinnitus andmete olemasolu kohta ajateabega määratud hetkel
= a message signed by the trusted party, which contains a hash formed from the data and time information, and is the confirmation by the trusted party of the existence of the data at the time specified by the time information

https://www.sysadmins.lv/blog-en/digital-signatures.aspx

https://www.advancedinstaller.com/digital-signature-timestamp.html

vt ka
- ajatempel