{
  "manageEntity": {
    "action": "Save",
    "entityId": "279270227",
    "entityType": "Track",
    "nonce": "0x74fe6173c1b20c6a319ddab68cb7d7a328ccb56f72ee05e8210e37a310c5de59",
    "signature": "0x2857d5961971c6edd35f6045804a024c2deecdaab4535de52a03df844521da9a59fd3bf5eac083dd2f85e0b796f995046210d59d7e6e039745883a49d753c7371c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}