{
    "nonce": "0x0000000000000042",
    "timestamp": "0x0",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "extraData": "0x0",
    "gasLimit": "0x8000000",
    "difficulty": "0x400",
    "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "coinbase": "0x3333333333333333333333333333333333333333",
    "alloc":
    {
        "0x228109924a389d103bd0b1de45ed47d3f2ff2294":
        { "balance": "20000000000000000000" },
        "0x3d04aa4310a958843dd30f184eb560f1de8ddf5f":
        { "balance": "20000000000000000000" },
        "0xd33593b1dbe0cdc4f8a6ac1abd754cc934c7de11":
        { "balance": "20000000000000000000" }
    }
}

{
    "config": {
        "chainId": 15,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0
    },
    "difficulty": "200",
    "gasLimit": "21000000",
    "alloc": {
        "7df9a875a174b3bc565e6424a0050ebc1b2d1d82": { "balance": "300000" },
        "f41c74c9ae680c1aa78f42e5647a62f353b7bdde": { "balance": "400000" }
    }
}

Add working genesis block JSON for Geth 1.6.5
Add working genesis block JSON for Geth 1.6.5
