{
  "manageEntity": {
    "action": "Save",
    "entityId": "554447203",
    "entityType": "Track",
    "nonce": "1792394373274024165",
    "signature": "0x52c5f5740950c6d9ec5a586d1f13788f6d6b8e3cdbef5d0f08c2a65519064c99600040de83822ba1c15906f0ecc487a6ff6bcd6a42f3eaf6c7cd6dce405803f01c",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}