Digital signature repository

Are there any newsgroups or web sites dedicated to storing digital
signatures? I've heard about people publishing signatures of important
documents in newspapers, creating a permanent, independent, dated
record that can be autheticated with some legal standing.

For example, say I author some legal doument and then digitally sign
it (with PGP, for example). I'd then like to register that signature
in some publicly accessible place, but one that maintains a reliable
dating of each record. Posting to a newsgroup, for instance, would be
sufficient on the theory that every post gets a unique ID and a
reliable timestamp. Futhermore, the newsgroup itself has no vested
interest in the content of my document, and only serves to keep a
permanent record of its digital signature (presumably I would supply
a title and some unique ID that's meaningful to me, such as a URL
or network filename).

I assume that sci.crypt is not the kind of place for this, but assuming
a reasonable volume of, say, a few thousand posts per day, a newsgroup
would be ideal for this purpose, and it has the nice benefit of being
free.

Does anyone know of such a place?

-drt

.

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