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Installation

Installing and using the private ethereum blockchain will probably not be necessary. More detailed tests have yet to be carried out.

Install Geth

$ sudo yum install golang
$ sudo yum install gmp-devel

$ git clone https://github.com/ethereum/go-ethereum && cd go-ethereum
$ make geth
$ cp build/bin/geth /usr/bin/.

Install IPFS

$ wget https://dist.ipfs.io/go-ipfs/v0.7.0/go-ipfs_v0.7.0_linux-amd64.tar.gz
$ tar -xvzf go-ipfs_v0.7.0_linux-amd64.tar.gz
$ cd go-ipfs
$ sudo ./install.sh

Setup

Setup blockchain with geth

Create a new directory for your private blockchain. In your terminal (Mac/Linux) or command prompt (Windows) window, navigate to the directory and create a new account:

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

Enter a password when prompted for your local Ethereum account. Geth will create a keystore directory and store the account file in the keystore.

Setup Genesis Block

Setting up a private blockchain requires defining a genesis block, which sets the initial parameters and token distribution.

In the directory containing your account, copy/paste/save the following JSON into a file called genesisblock.json:

{
    "config": {
        "chainID"       : 10,
        "homesteadBlock": 0,
        "eip150Block":    0,
        "eip155Block":    0,
        "eip158Block":    0
    },
    "nonce": "0x01",
    "difficulty": "0x20000",
    "mixhash": "0x00000000000000000000000000000000000000647572616c65787365646c6578",
    "coinbase": "0x0000000000000000000000000000000000000000",
    "timestamp": "0x00",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "extraData": "0x00",
    "gasLimit": "0x2FEFD8",
    "alloc": {
    }
}

This will be block 0 of your private blockchain. If you ever wish to have others join this network, they will need this genesis block as well.

We will now instantiate the blockchain network and load the geth console:

geth --datadir="./" init genesisblock.json
geth --datadir="./" --networkid 23422  --http --http.corsdomain="*" --http.port="8545" --minerthreads="1" --mine --nodiscover --maxpeers=0 --unlock 0 console --allow-insecure-unlock

Setup IPFS

$ ipfs init
$ echo -e "/key/swarm/psk/1.0.0/\n/base16/\n$(tr -dc 'a-f0-9' < /dev/urandom | head -c64)" > .ipfs/swarm.key
$ ipfs config --json API.HTTPHeaders.Access-Control-Allow-Origin '["http://localhost:3000", "https://webui.ipfs.io", "http://127.0.0.1:5001"]'
$ ipfs config --json API.HTTPHeaders.Access-Control-Allow-Methods '["POST"]'

Run IPFS locally

export LIBP2P_FORCE_PNET=1 && ipfs daemon

Setting LIBP2P_FORCE_PNET to 1, will force IPFS to use a private network.