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Your document titled: hello world is about to be stampd on the blockchain. Please proceed with payment of EUR 1.49 through Paypal by clicking on the button b

by logn 12y ago

Your document titled: hello world is about to be stampd on the blockchain. Please proceed with payment of EUR 1.49 through Paypal by clicking on the button below. After payment and the appropriate blockchain transaction transmittal, a PDF certificate will be sent to your email address as registered in Paypal. It would be nice to support payment with bitcoin. Also in addition to emailing a receipt, let users download a receipt right there. Also I'm not sure what exactly a webapp is needed for. I wouldn't use it for anything important. How do I know without looking through your client side JS that you're not sending a copy somewhere? It would be nice to write an open source app, stamp that app's hash in the block chain, and then use that stamped app to stamp other documents, all locally. Or keep the web version too as an alternative. If you want to make money off of that, provide some enterprisey tools for people to verify previously stamped documents or other value-add services not related to the core offering. I think you're losing 99% of early adopters with a fee (is that essential to pay miners or something?). edit: It seems like I'd need a way to verify my identity as part of this hash for it to be of value. Can your certificates be forged? A verifiable and un-forgeable certificate would be valuable. Or perhaps I associate a BTC wallet id with a small amount of money in it and that's part of the overall document hash too. So when I want to prove I hashed it, I send a tiny fraction of a bitcoin from that wallet (and it could be an unpredictable fraction, to serve as a one time PIN). Making all that easy to verify for someone like an underwriter or lawyer could be a nice way for you to make money.

snuxoll 12y ago
You aren't worried about the certificate itself being forged, all it contains is details on the block that the document was signed on and the hash of the document, you can't forge this since you still have to make a SHA256 hash of the document and verify it against the blockchain. The whole point of this transaction is the blockchain itself records the time that a specific block was mined, if the hash of the document was in that block then that means the document did in fact exist at the time.
- logn 12y ago
  > then that means the document did in fact exist at the time I was thinking of a way to prove too that I certified that document, to tie it back to my identity.
  - abacus76 12y ago
    you could prove that you certified the document by including your name and or signature within the document!
altereg0 12y ago
We do plan to support a stamp payment in bitcoin (of course!). The certificate is issued only after 2 blockchain confirmations (that is why we email it later because this takes about 15 to 30 mins). It is also available on line on stampd after that! From our perspective a fee is essential both for the transaction miner fees but also to prevent blockchain bloating. Regarding the certificate forging: Our certificate only refers to what the blockchain shows. We decided to issue such certificate in order to allow the user to easily refer to the stamping. It is the blockchain that cannot be forged! Your suggestions are all very interesting and we are grateful for sharing. We will certainly explore them further. We are fascinated by the potentials of blockchain's public ledger and of course these and many more ideas could have outstanding applications.

by logn 12y ago

snuxoll 12y ago

You aren't worried about the certificate itself being forged, all it contains is details on the block that the document was signed on and the hash of the document, you can't forge this since you still have to make a SHA256 hash of the document and verify it against the blockchain. The whole point of this transaction is the blockchain itself records the time that a specific block was mined, if the hash of the document was in that block then that means the document did in fact exist at the time.

logn 12y ago
> then that means the document did in fact exist at the time I was thinking of a way to prove too that I certified that document, to tie it back to my identity.
- abacus76 12y ago
  you could prove that you certified the document by including your name and or signature within the document!

altereg0 12y ago

We do plan to support a stamp payment in bitcoin (of course!). The certificate is issued only after 2 blockchain confirmations (that is why we email it later because this takes about 15 to 30 mins). It is also available on line on stampd after that! From our perspective a fee is essential both for the transaction miner fees but also to prevent blockchain bloating. Regarding the certificate forging: Our certificate only refers to what the blockchain shows. We decided to issue such certificate in order to allow the user to easily refer to the stamping. It is the blockchain that cannot be forged! Your suggestions are all very interesting and we are grateful for sharing. We will certainly explore them further. We are fascinated by the potentials of blockchain's public ledger and of course these and many more ideas could have outstanding applications.