{
  "manageEntity": {
    "action": "Save",
    "entityId": "60398774",
    "entityType": "Track",
    "nonce": "0x92ce7b572fc1c9bf96cb666b637cedfc7c904e319761a47c36067be9be6871bd",
    "signature": "0x12ca2763bfdf1d29991e64e4c34a67278ee5e6a98a677f0ffe2151e2f23f80d901ac5197b86ea909b68a6e5e81fc353880d1ab32eef872d1ca647ad7ea243def1b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}