Hmmm thats weird try this
{
"chain_name": "Testnet Beta 4",
"block_gas_limit": 30000000,
"initial_state": {
"coins": [
{
"owner": "0xa1184d77d0d08a064e03b2bd9f50863e88faddea4693a05ca1ee9b1732ea99b7",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0xb5566df884bee4e458151c2fe4082c8af38095cc442c61e0dc83a371d70d88fd",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0x9da7247e1d63d30d69f136f0f8654ee8340362c785b50f0a60513c7edbf5bb7c",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0x4b2ca966aad1a9d66994731db5138933cf61679107c3cde2a10d9594e47c084e",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0x26183fbe7375045250865947695dfc12500dcc43efb9102b4e8c4d3c20009dcb",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0x81f3a10b61828580d06cc4c7b0ed8f59b9fb618be856c55d33decd95489a1e23",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0x587aa0482482efea0234752d1ad9a9c438d1f34d2859b8bef2d56a432cb68e33",
"amount": "0x1000000000000000",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
]
},
"transaction_parameters": {
"contract_max_size": 16777216,
"max_inputs": 255,
"max_outputs": 255,
"max_witnesses": 255,
"max_gas_per_tx": 10000000,
"max_script_length": 1048576,
"max_script_data_length": 1048576,
"max_storage_slots": 255,
"max_predicate_length": 1048576,
"max_predicate_data_length": 1048576,
"max_gas_per_predicate": 10000000,
"gas_price_factor": 92,
"gas_per_byte": 4,
"max_message_data_length": 1048576,
"chain_id": 0
},
"gas_costs": {
"add": 1,
"addi": 1,
"aloc": 1,
"and": 1,
"andi": 1,
"bal": 13,
"bhei": 1,
"bhsh": 1,
"burn": 132,
"cb": 1,
"cfei": 1,
"cfsi": 1,
"croo": 16,
"div": 1,
"divi": 1,
"eck1": 951,
"ecr1": 3000,
"ed19": 3000,
"eq": 1,
"exp": 1,
"expi": 1,
"flag": 1,
"gm": 1,
"gt": 1,
"gtf": 1,
"ji": 1,
"jmp": 1,
"jne": 1,
"jnei": 1,
"jnzi": 1,
"jmpf": 1,
"jmpb": 1,
"jnzf": 1,
"jnzb": 1,
"jnef": 1,
"jneb": 1,
"k256": 11,
"lb": 1,
"log": 9,
"lt": 1,
"lw": 1,
"mcpi": 33,
"mint": 135,
"mlog": 1,
"mod": 1,
"modi": 1,
"move": 1,
"movi": 1,
"mroo": 2,
"mul": 1,
"muli": 1,
"mldv": 1,
"noop": 1,
"not": 1,
"or": 1,
"ori": 1,
"ret_contract": 13,
"rvrt_contract": 13,
"s256": 2,
"sb": 1,
"scwq": 13,
"sll": 1,
"slli": 1,
"srl": 1,
"srli": 1,
"srw": 12,
"sub": 1,
"subi": 1,
"sw": 1,
"sww": 43,
"swwq": 44,
"time": 1,
"tr": 105,
"tro": 60,
"wdcm": 1,
"wqcm": 1,
"wdop": 1,
"wqop": 1,
"wdml": 1,
"wqml": 1,
"wddv": 1,
"wqdv": 2,
"wdmd": 3,
"wqmd": 4,
"wdam": 2,
"wqam": 3,
"wdmm": 3,
"wqmm": 3,
"xor": 1,
"xori": 1,
"call": {
"base": 144,
"dep_per_unit": 214
},
"ccp": {
"base": 15,
"dep_per_unit": 103
},
"csiz": {
"base": 17,
"dep_per_unit": 790
},
"ldc": {
"base": 15,
"dep_per_unit": 272
},
"logd": {
"base": 26,
"dep_per_unit": 64
},
"mcl": {
"base": 1,
"dep_per_unit": 3333
},
"mcli": {
"base": 1,
"dep_per_unit": 3333
},
"mcp": {
"base": 1,
"dep_per_unit": 2000
},
"meq": {
"base": 1,
"dep_per_unit": 2500
},
"retd_contract": {
"base": 29,
"dep_per_unit": 62
},
"smo": {
"base": 209,
"dep_per_unit": 55
},
"srwq": {
"base": 47,
"dep_per_unit": 5
}
},
"consensus": {
"PoA": {
"signing_key": "f65d6448a273b531ee942c133bb91a6f904c7d7f3104cdaf6b9f7f50d3518871"
}
}
}