nimbus-eth1/tools/t8n/testdata/00-511/env.json

{
    "currentCoinbase" : "0x3535353535353535353535353535353535353535",
    "currentDifficulty" : "0x020000",
    "currentNumber" : "0x00",
    "currentTimestamp" : "0x03b6",
    "currentGasLimit" : "0x05f5e100",
    "previousHash" : "0x0000000000000000000000000000000000000000000000000000000000000000"
}