We are using the following genesis:
{
"alloc": {
"0x0c1c28336F5F256bD6657215F00eE83121e51336": { "balance": "88888888888888888888888888" }
},
"config": {
"chainId": 15,
"homesteadBlock": 0,
"eip150Block": 0,
"eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"eip155Block": 0,
"eip158Block": 0,
"byzantiumBlock": 0,
"petersburgBlock": 0,
"constantinopleBlock": 0,
"istanbulBlock": 0,
"clique": {
"period": 1,
"epoch": 30000
}
},
"nonce": "0x000000000000002a",
"difficulty": "0x1",
"mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"coinbase": "0x0000000000000000000000000000000000000000",
"timestamp": "0x00",
"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"extraData": "0x00000000000000000000000000000000000000000000000000000000000000000c1c28336F5F256bD6657215F00eE83121e513360000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"gasLimit": "0X14F46B04000"
}