private ethereum blockchain howto

my-genesis.json

{
  "nonce": "0x0000000000000042",
    "timestamp": "0x0",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "extraData": "0x0",
    "gasLimit": "0x8000000",
    "difficulty": "0x400",
    "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "coinbase": "0x3333333333333333333333333333333333333333",
    "alloc": {
        "<your private chain wallet>": {
            "balance": "10000000000000000000"
        }
    }
}

private-chain.sh

#!/bin/bash

# run from go-ethereum directory
# creates private chain at `--datadir` location
# expects the my-genesis file in the same directory
# BEWARE -- runs rpc on default 8545 port!
exec ./build/bin/geth --identity "PrivateNode" --rpc --rpccorsdomain "*" --datadir "/Users/aaron/ethereum/privatechain" --port "30303" --nodiscover --rpcapi "db,eth,net,web3" --networkid 1999 console init my-genesis.json

Private-Ethereum-Blockchain-README.md

guide to set up private block chain:

• https://souptacular.gitbooks.io/ethereum-tutorials-and-tips-by-hudson/content/private-chain.html
• https://github.com/ethereum/homestead-guide/blob/master/source/network/test-networks.rst
• https://github.com/ethereum/go-ethereum

prerequisites:

• install golang

install geth using go:

• go get -d github.com/ethereum/go-ethereum
• cd $GOPATH/src/github.com/ethereum/go-ethereum
• make geth (installs geth to ~/go/src/github.com/ethereum/go-ethereum/build/bin/geth)

set up and run private blockchain:

• alternate private blockchain with gethdev https://github.com/amacneil/gethdev
• copy private-chain.sh and my-genesis.json to ~/go/src/github.com/ethereum/go-ethereum
• make private-chain.sh executable chmod +x private-chain.sh
• execute ./private-chain.sh and use js console
  • note: js console commands: https://github.com/ethereum/go-ethereum/wiki/JavaScript-Console

create new private block chain account

• from terminal: in a new terminal window run ${HOME}/go/src/github.com/ethereum/go-ethereum/build/bin/geth account new --datadir <your private chain directory>
• from js console: personal.newAccount("<password>")
• back in the geth console you can now see the account by running: eth.accounts[0]

mine some ether to your account

• locate the ipc file on disk. Can be found when first starting local geth. (/Users/aaron/ethereum/privatechain/geth.ipc). This will allow you access to the miner.
• attach to the running geth IPC node on localhost ./build/bin/geth attach "/Users/aaron/ethereum/privatechain/geth.ipc" --datadir "/Users/aaron/ethereum/privatechain"
• unlock the eth acccount to mine if necessary personal.unlockAccount(eth.accounts[0], "<your account password>")
• in the console set your account for the miner miner.setEtherbase(eth.accounts[0]); this should return true
• finally run miner.start(1) (1 thread)
• check balances with balance = web3.fromWei(eth.getBalance(eth.accounts[0]), "ether");

Is identity some secret?

geth flag: --identity value Custom node name