ContractOrder(ContractOrder)

{
    "hash": "string",
    "salt": "string",
    "maker": "string",
    "signer": "string",
    "taker": "string",
    "tokenId": "string",
    "makerAmount": "string",
    "takerAmount": "string",
    "expiration": 0,
    "nonce": "string",
    "feeRateBps": "string",
    "side": 0,
    "signatureType": 0,
    "signature": "string"
}