{
  "manageEntity": {
    "action": "Save",
    "entityId": "1254790175",
    "entityType": "Track",
    "nonce": "0x77dbfc5609123b9290a296fd32cc6b218f75b3fa83408c95acd6aca29cecf979",
    "signature": "0x2ef0aca7e61904fda4797065d306d3f7343a6557af8fe868e3fb283714ad377e0a3b919888476e84c23fb03d48a1dd60885897d3f1205a7abcfc673d5a1121111b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}