Hi guys,
Blocknotary founder is here.
if you modify a photo you will have a different hash. And you will not be able to verify modified version it in the blockchain.
We upload a photo to our cloud and it remains unmodified there. From the app, you can access it or you can press "share to email" the app will send to your email address a receipt with a link to the file.
Something like that:
P.S. It's me on the left.
You can drop this photo to
http://www.blocknotary.com/validate and it will get you a link to the block and the transaction where the hash of your photo has been stored.
Easiest question would be if I email a photo from my phone to myself will it end up with same hash. some phones give you the option to select file size to send, that would change the hash.
- answer
" Get the photo
You can use Mail client on the phone. Never compress the photo because you will have different hash. "
-http://blocknotary.helpshift.com/a/block-notary/?s=general&f=how-to-check-photo-validation-on-the-web
2nd.. this is awesome as you can take a photo of a contract recently signed and get it hashed easily on your phone. hopefully the gui wallet works just as easily and i look forward to the future where hopefully a web wallet can take care of this service without people running a local client.
3rd.. as another layer of proof of existence has anyone thought about contract signing and uploading the hash to have the other party verify the document and the hash and sign off on it as the copy they are familiar with? some kind of multisig.