{
  "manageEntity": {
    "action": "Save",
    "entityId": "1769134317",
    "entityType": "Track",
    "nonce": "0x5428369af20460eb7e6e52e41a3ef11f33627bc283cd9661ebe496da9c77a254",
    "signature": "0x6874fafd4028f22b65f9541bcc21cfcebb70c6771725ac49d2508aea1afef08865a7edfb50efc43c277c29fc7a8a9581ce18ec26670f963fbaf727dc972d723e1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}