nimbus-eth1/tools/t8n/testdata/00-501/env.json

{
    "currentCoinbase" : "0x2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
    "currentDifficulty" : "0x020000",
    "currentNumber" : "0x00",
    "currentTimestamp" : "0x00",
    "currentGasLimit" : "0x05500000",
    "previousHash" : "0x0000000000000000000000000000000000000000000000000000000000000000"
}