{
  "manageEntity": {
    "action": "Save",
    "entityId": "308768148",
    "entityType": "Track",
    "nonce": "0x4dfbba9f338af5aaf25e796e2f95a8edbd307adf6585b83de2a92f386ea0daec",
    "signature": "0xe3fae702ee5bbdd47e1eed306af3be22d39774b5540b7bcd800b14d3a304c3f85fb83f51e666fd9999ad2193fbbf64356c4bf58ed62603fb791fcb8ea9dbafb71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}