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#Ethereum Private Blockchain Tinkering:

Guidlines for getting connected to the private network.

##Overview.

The network consists of Raspberry pi with dhcp server (ip address 192.168.0.1) running a go-ethereum node initated with the genesis.json file (not mining). The intent is to create a network of local computers over which a private blockchain can be created. To help do this, follow the guidance below for different clients:

Instructions for Go-ethereum "geth":

  1. Install go-ethereum or other client; https://ethereum.github.io/go-ethereum/install/
  2. Establish ethernet connection to pi - connect cable to switch (or wifi to router) and make sure network interface "obtains IP address automatically" in your adapter settings.
  3. Save the below as a file called genesis.json
{
  "alloc": {},
  "nonce": "0x0000000000000042",
  "difficulty": "0x020000",
  "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "timestamp": "0x00",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "extraData": "0x",
  "gasLimit": "0x2fefd8"
}

This defines the genesis block for the private blockchain. This must be the same for all participants

  1. On command line run, geth init /path/to/your/genesis.json This initialises the first block. You are now primed to connect to the priveate Ethereum p2p network
  2. Now do: geth --networkid 12345 --port 33333 This gets the machine ready to find the local network. The networkid and port were arbitrarily chosen when I set up the pi. N.b. --verbosity 5 will give lots of messages about the network and what is going on. If unsuccessful, check your firewall (allow connections on TCP port 33333).
  3. Next, in a new command window (leave the other one open): geth attach This gives you a javascript console to interact with; a > prompt command reference
  4. Next do: admin.addPeer("enode://6c461262a4cdb658d7852af41a433668dea467da87168390d02e22c6191fc136063a7df859e46a65786de6c3f73670f00d2378b5e17ec3142a84ded8029e1728@192.168.0.1:33333") This connects the link (TCP) for your machine in the local network. It creates the first Peer to Peer link for your machine and results in a connection to the RaspberryPi. The address enodeURL was taken from the RPi's node.
  5. Do admin.peers to check, you should see a list of connected peers.
  6. personal.newAccount("yourPassword") to create a new accoount - it will give you a hex format accnt no
  7. miner.setEtherbase("yourAccount")
  8. miner.start() this will start mining, with the rewards going to your account. You are now in a position to start playing with smart contracts on the private network!
  9. To send a transaction

eth.sendTransaction(<amount to send here, e.g. 100000000>, {from:eth.accounts[0],to:"0X<insert account no>,gas:3000000})

Or open a UI, e.g. mist, metamask chrome plugin (https://metamask.io/)