All infos are optional, but in my prevalent-implementation i required that any three options had to be specified, but no specific one was required.

These are of course additional to the hash-values, which are required :)

• filename
• the filename that was timestamped

• projecthomepage
• the url of the project's homepage

• projectname
• name of the project to which the file belongs

• documenttype
• currently: undefined, text or binary

• downloadurl
• url where the file is available for public download

• submission time/date
• when this info was sent to the publictimestamp server

• email
• contact email address. This information can be requested for help in legal cases. We could also implement a way to send emails via a web-form without showing the email address.

• submission IP
• the IP address from which the submission was sent to us; only statistically interesting.

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