config.json

{
  "sealEngine": "Ethash",
  "params": {
    "accountStartNonce": "0x00",
    "maximumExtraDataSize": "0x20",
    "homesteadForkBlock": "0x00",
    "daoHardforkBlock": "0x00",
    "EIP150ForkBlock": "0x00",
    "EIP158ForkBlock": "0x00",
    "byzantiumForkBlock": "0x00",
    "constantinopleForkBlock": "0x00",
    "constantinopleFixForkBlock": "0x00",
    "istanbulForkBlock": "0x00",
    "minGasLimit": "0x5208",
    "maxGasLimit": "0x7fffffffffffffff",
    "tieBreakingGas": false,
    "gasLimitBoundDivisor": "0x0400",
    "minimumDifficulty": "0x100000",
    "difficultyBoundDivisor": "0x0800",
    "durationLimit": "0x0d",
    "blockReward": "0x4563918244F40000",
    "networkID" : "0x42",
    "chainID": "0x42",
    "allowFutureBlocks" : false
  },
  "genesis": {
    "nonce": "0x0000000000000042",
    "difficulty": "0x100000",
    "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "author": "0x0000000000000000000000000000000000000000",
    "timestamp": "0x5A5B92D7",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "extraData": "0x655741534d2074657374206e6574776f726b2030",
    "gasLimit": "0x17d7840"
  },
  "accounts": {
    "/* INSERT HERE YOUR ACCOUNT */": {
        "balance" : "0x200000000000000000000000000000000000000000000000000000000000000"
    }
  }
}