genesis.json

{
  "config": {
      "chainId": 7,
      "homesteadBlock": 0,
      "daoForkBlock": 0,
      "daoForkSupport": true,
      "eip150Block": 0,
      "eip150Hash": "0x5de1ee4135274003348e80b788e5afa4b18b18d320a5622218d5c493fedf5689",
      "eip155Block": 0,
      "eip158Block": 0
  },
  "coinbase": "0x0000000000000000000000000000000000000000",
  "difficulty": "0x30000",
  "extraData": "0x64616f2d686172642d666f726b",
  "gasLimit": "0x2fefd8",
  "nonce": "0x00006d6f7264656e",
  "mixhash": "0x00000000000000000000000000000000000000647572616c65787365646c6578",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp": "0x1234",
  "alloc": {
  }
}