jObject属性的索引不起作用c#

我正在将比特币事务字符串解析为JObject(它是 JSON格式)并且想要在 JSON字符串中引用prev_out哈希值和第二个值(请参阅下面的示例).正如你在下面看到的,我试图使用索引获取属性值,但我一直得到null.请帮忙！

典型的JSON字符串是什么样的：

{
    "hash" : "4ebf7f7ca0a5dafd10b9bd74d8cb93a6eb0831bcb637fec8e8aabf842f1c2688","ver" : 1,"vin_sz" : 1,"vout_sz" : 2,"lock_time" : 0,"size" : 225,"in" : [{
            "prev_out" : {
                "hash" : "bf7d91ac70917f98b497927e1b07267507652b206df14ecdba2e9390b9bffc65","n" : 0
            },"scriptSig" :
            "                               3044022069b6b0f1a8d453bdb89e3ad475232b8e01d2851e7b53acab3f830f40e80b3b5102203c0   49
                    867975360020293c735d48b4a2dda003aa781c1d8ccd2c7af290dcd11de01
                    02e3538427350039e67ea99e935cefb740badf3d09ebc301b0bc9d1bb0301a3417"
        }
    ],"out" : [{
            "value" : "0.08990000","scriptPubKey" : "OP_DUP OP_HASH160 5b1d720daf0e95e37d0eaedd282b6ed9a40bab71
                     OP_EQUALVERIFY OP_CHECKSIG"
        },{
            "value" : "0.01000000","scriptPubKey" : "OP_DUP OP_HASH160 71049fd47ba2107db70d53b127cae4ff0a37b4ab
                    OP_EQUALVERIFY OP_CHECKSIG"
        }
    ]
}

我试图使用这个引用prev_out哈希值：

JObject transaction = JObject.Parse(t1);
var d = transaction["in"][0]["hash"];

其中t1是JSON事务字符串

我尝试使用以下方法获取第二个值属性：

JObject v = JObject.Parse(t1);
var val = v["out"][1]; //second value starting from 0
value = val.ToString();

var d = transaction["in"][0]["prev_out"]["hash"];