j"1LAnZuoQdcKCkpDBKQMCgziGMoPC4VQUckM<div class="post"><div class="quoteheader"><a href="https://bitcointalk.org/index.php?topic=770.msg8534#msg8534">Quote from: Red on August 10, 2010, 02:22:09 PM</a></div><div class="quote">By the way, this is the way most digital notary services work. You send them a hash of a signed document and they log it permanently. Then they create a hash chain like bitcoin does. They periodically publish the current hash chain value in a newspaper or other offline redundant record.<br/><br/>You don't have to send your private documents/transaction to the notary for them to be time stamped and recorded. The notary is just certifying that something that matched this hash existed at this point in time.<br/><br/></div><br/>You also don't have to prove to the notary that you have X BTC in your account to spend.<br/><br/>Although I was recently reading about <a href="http://en.wikipedia.org/wiki/Zero-knowledge_proof">Zero-knowledge proofs</a> if you could use something like that to prove that your account had X BTC in it without revealing anything else it might be what you're looking for.<br/><br/>I'm just worried what you want is theoretically impossible.</div> text/html
https://whatsonchain.com/tx/f3bb4b2848dde0a2a39c82c8caa96c65a7e207bc4ee9bdd80cdb7aaaa75138b2