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replaced http://tools.ietf.org/html/rfc with https://www.rfc-editor.org/rfc/rfc

If you search on "timestamp", "timestamping", and "notary" on Crypto.SE and Security.SE, you'll find lots of references. I've collected a number of timestamping services that were mentioned in one of those places; this should provide a number of companies and online services you can check out:

I cannot vouch for or endorse any of those.

See, for instance, the following questions on this site, and the following other resources:

Happy reading!

D.W.
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