Storage dApp with IPFS + Ethereum

This article is about how to run IPFS Ethereum Storage dApp at https://github.com/llSourcell/IPFS_Ethereum_Storage

Most of time, following ReadMe from the git is enough but you need to know a little bit about Web Console of FireBox.

Install IPFS

Download binary from https://ipfs.io/docs/install/

Initialize an Ethereum node for mining

Why? Because we need to mine Ethereum to fetch uploaded file.

$ geth --datadir="./" account new

To run a private blockchain, you need to have a genesis node (the very first block of your private blockchain!)

Save follow json data as genesisblock.json

{
    "config": {
        "chainID"       : 10,
        "homesteadBlock": 0,
        "eip155Block":    0,
        "eip158Block":    0
    },
    "nonce": "0x01",
    "difficulty": "0x20000",
    "mixhash": "0x00000000000000000000000000000000000000647572616c65787365646c6578",
    "coinbase": "0x0000000000000000000000000000000000000000",
    "timestamp": "0x00",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "extraData": "0x00",
    "gasLimit": "0x2FEFD8",
    "alloc": {
    } 
}

Then, initiate Ethereum blockchain:
$ geth --datadir="./" init genesisblock.json

Load the geth console:
$ geth --datadir="./" --networkid 23422 --rpc --rpccorsdomain="*" --rpcport="8545" --minerthreads="1" --mine --nodiscover --maxpeers=0 --unlock 0 console

Initialize IPFS

$ ipfs init
$ ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin '["*"]'
$ ipfs config --json Gateway.HTTPHeaders.Access-Control-Allow-Origin '["*"]'

CORS configuration to access remote content from ipfs.

run ipfs daemon:
$ ipfs daemon

Run IPFS dApp

Now, open storage.html file with FireFox and

Tools > Web Developer > Web Console

Type commands in the command line

• deployStorage()
  
• storeContent("https://upload.wikimedia.org/wikipedia/commons/e/e4/160618_MBC_Thank_You_Festival_%E2%80%93_Red_Velvet.jpg")
• storeAddress("QmbWQBKEaVBBc42sVbCUwJc294awGeb17aUEf6ijXxcVTk")
• fetchContent()

To check your uploaded file, open the ipfs url from your browser: http://localhost:8080/ipfs/QmbWQBKEaVBBc42sVbCUwJc294awGeb17aUEf6ijXxcVTk or
https://gateway.ipfs.io/ipfs/QmbWQBKEaVBBc42sVbCUwJc294awGeb17aUEf6ijXxcVTk

[wikemedia & MBC]

IPFS (InterPlanetary File System) is a distributed file system inspired by years of research into distributed systems that content addresses data. It stores data in a distributed hash table, transfer it via a bit torrent like mechanism, and structures it in the form of a merkleDAG. To give it all a human readable address by using a naming system called IPNS.

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