Notary as in trustworthy authority.
Proxy as in we’ll host your originals. Or maybe just an original reference document plus a checksum via the public API.
Together they provide a badge of certitude that this is the original check-summed image that was first provided to N.P. at a certain time.
effective date: 2008-06-04
formerly at: http://www.triopticon.com/Members/kewball/posts/notary-proxy