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A single flipped byte destroys the entire concept. Tech savvy people can deal with this, but not the average joe.
Cool concept nonetheless.
1. Make a SHA1 hash of your document 2. Convert the hash to a BTC address 3. Send 0.0001 BTC to the address you made 4. There you saved yourself $9.99
1. Make a SHA1 hash of your document 2. Convert the hash to a BTC address 3. Send 0.0001 BTC to the address you made 4. There you saved yourself $9.99
Note that this appears to be a $9.99 version of http://www.proofofexistence.com/ , a free service. Also, this does not appear to be affiliated with the popular bitcoin exchange Bitstamp.
I wonder how this deals with like .docx files or .xlsx (Excel) files. Even of you change 0 fields it might end up "mutated" and the Proof does not longer work. A single flipped byte destroys the entire concept. Tech savvy people can deal with this, but not the average joe. Cool concept nonetheless.
1. Make a SHA1 hash of your document 2. Convert the hash to a BTC address 3. Send 0.0001 BTC to the address you made 4. There you saved yourself $9.99
Practically speaking, couldn't I just tweet the SHA1 hash and let Twitter be my trusted timestamp authority? Assuming I don't work for Twitter, it's unlikely I'm able to modify the timestamp on a tweet. (The blockchain has a lot more confidence due to its distributed nature, but in the minds of say, a jury of your peers, I bet it actually appears shadier than Twitter.)
I even worked out how to do the whole verification part that it works out of the box without the need for any software or 3rd party service. You just needed a Windows box. Still that made no difference whatsoever, because ultimately selling this sort of service is like selling insurance. You have to force people to think about bad things that could happen in order to make a sale, and that's just not everyone's cup 'o tea.
Postmortem - http://swapped.cc/certtime