https://github.com/tomconte/ethereum-fossilizer
This is a sample Ethereum application built using Truffle. It allows you to "fossilize" documents by storing their hash using a smart contract.
https://github.com/tomconte/ethereum-fossilizer
Last synced: about 1 month ago
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This is a sample Ethereum application built using Truffle. It allows you to "fossilize" documents by storing their hash using a smart contract.
- Host: GitHub
- URL: https://github.com/tomconte/ethereum-fossilizer
- Owner: tomconte
- Created: 2016-06-29T14:10:48.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2016-09-21T10:19:15.000Z (over 8 years ago)
- Last Synced: 2025-03-29T10:05:17.466Z (about 2 months ago)
- Language: JavaScript
- Size: 149 KB
- Stars: 4
- Watchers: 2
- Forks: 1
- Open Issues: 1
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Metadata Files:
- Readme: README.md
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README
# Ethereum Fossilizer
This is a demo project that shows how an Ethereum Smart Contract can be used to "fossilize" documents in a blockchain. The intent is to store the hash of a document, together with some metadata, to serve as later proof of existence of said document. The same principle can also be used for e-mails, as shown in the [fossilizer-addin](https://github.com/tomconte/fossilizer-addin) demo running within Outlook 365.
This project consists of a DApp, written using the [Truffle](https://truffle.readthedocs.io/en/latest/) framework, that runs on your local machine and allows you to drag and drop documents into a directory to fossilize the document. It also exposed a Web page that allows you to see documents and e-mails being fossilized, and check the existence of a document by entering its hash.
## Testing using a private blockchain
I recommend using a private blockchain for development and testing so that you don't have to pay actual Ether. You could also use [EthereumJS TestRPC](https://github.com/ethereumjs/testrpc) as recommended in the Truffle documentation.
You can follow our [Ethereum "Blockchain as a service" on Azure tutorial](https://github.com/Azure/azure-blockchain-projects/tree/master/baas-artifacts/linux-go-ethereum) to quickly create a Linux VM running a private node.
## Running the application
You will need to install the [Truffle](https://github.com/ConsenSys/truffle) tool. Follow the [official Truffle documentation](http://truffle.readthedocs.io/en/latest/) for installation instructions (hint: it requires Node.JS).
- Compile and deploy the contract
```
truffle compile
truffle deploy
```
- Build and run the application
```
truffle build
truffle serve
```
- Run the fossilizer process
```
node watcher.js
```
## Using the application
The watcher process looks into its `root` subdirectory for documents. Just copy or move a document into this directory to fossilize it.
To access the DApp interface, point your browser to http://localhost:8080. This will display a log of documents or e-mails being fossilized. You can also paste an `sha256` hash of a document to check for its existence.