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pragma solidity ^0.4.0;
    
// A simple smart contract
contract MessageContract {
    string message = "Hello World";
    
    function getMessage() public constant returns(string) {
        return message;
    }
    

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{
  "config": {
        "chainId": 15,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0
    },
  "alloc"      : {},
  "coinbase"   : "0x0000000000000000000000000000000000000000",
  "difficulty" : "0x20000",

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D:\ethereum-examples\example_1>geth --datadir=./chaindata init genesis.json
WARN [07-22|10:37:13] No etherbase set and no accounts found as default
INFO [07-22|10:37:13] Allocated cache and file handles         database=D:\\ethe
reum-examples\\example_1\\chaindata\\geth\\chaindata cache=16 handles=16
INFO [07-22|10:37:13] Writing custom genesis block
INFO [07-22|10:37:13] Successfully wrote genesis state         database=chaindat
a                                                    hash=5e1fc7.d790e0
INFO [07-22|10:37:13] Allocated cache and file handles         database=D:\\ethe
reum-examples\\example_1\\chaindata\\geth\\lightchaindata cache=16 handles=16
INFO [07-22|10:37:13] Writing custom genesis block

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D:\ethereum-examples\example_1>geth --datadir=./chaindata --nodiscover
WARN [07-22|10:42:22] No etherbase set and no accounts found as default
INFO [07-22|10:42:22] Starting peer-to-peer node               instance=Geth/v1.
7.3-stable-ab5646c5/windows-amd64/go1.9
INFO [07-22|10:42:22] Allocated cache and file handles         database=D:\\ethe
reum-examples\\example_1\\chaindata\\geth\\chaindata cache=128 handles=1024
WARN [07-22|10:42:22] Upgrading chain database to use sequential keys
INFO [07-22|10:42:22] Initialised chain configuration          config="{ChainID:
 15 Homestead: 0 DAO: <nil> DAOSupport: false EIP150: <nil> EIP155: 0 EIP158: 0 M
etropolis: <nil> Engine: unknown}"

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D:\ethereum-examples\example_1>geth attach
Welcome to the Geth JavaScript console!

instance: Geth/v1.6.7-stable-ab5646c5/windows-amd64/go1.8.3
 modules: admin:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txp
ool:1.0 web3:1.0

>

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> miner.start(2);
null
>

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> miner.stop();
true
>

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0x004b176924f2074a562b80c0b2932658Fb6FDfa7

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0x004b176924f2074a562b80c0b2932658Fb6FDfa7

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D:\ethereum-examples\example_1>geth --help | more
NAME:
   geth - the go-ethereum command line interface

   Copyright 2013-2017 The go-ethereum Authors

USAGE:
   geth [options] command [command options] [arguments...]
   
VERSION: