Hi Product Hunt, We are Stampery, we provide legally binding proofs of existence, integrity and ownership of any file or email, using the Bitcoin blockchain. You just have to upload a file, choose whether to store a backup on our servers or not, and click a button. We also create a unique email address for each user, so you can just create a rule in your email and BCC everything. The best interface is the one that doesn't even exist. Thanks you all guys!

Extremely easy to use! Simply BCC your Stampery email address to notarize your message.

They hide a lot of complexity behind their easy-to-use interface. That's hard to pull off. Great work!

Found out about Stampery at Menorca Millennials showcase this weekend, great team and very interesting use of the blockchain...

This is an awesome idea. We're all waiting for having all our legal stuff in the blockchain.

Between this and Ascribe I'm really enjoying seeing people using Blockchain in creative and effective ways. Great idea, great execution!

Great idea and product. When you say "Legally Binding", is it applicable by US regulation in the courts here?

Did you had a look at Ethereum - seems to be an appropriate system for smart contracts