Ethereum based notary service
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Readme.md

Blockchain certification application

A front-end connecting to a smart contract on the Ethereum blockchain, which allows saving a timestamped SHA-256 hash for a document.

Hashes are calculated in-browser and sent using Web3.

By default a Web3 injected into the browser is used (e.g. MetaMask or Mist).

The contract is deployed on mainnet, rinkeby and kovan.

If no Web3 object is found the code connects via a back-end to the INFURA API. In this case the Rinkeby network is used.

the back-end uses a file keys.json with private keys and api keys, which is not included the public repository for obvious reasons. The syntax is:

{
  "account" : "<ethereum account>",
  "privKey" : "<account private key without leading 0x>",
  "infuraApiKey": "<infura API key>"
}  

A working version is deployed at (https://block-cert.herokuapp.com/).

This project is licensed under the terms of the MIT license.