{
  "manageEntity": {
    "action": "Save",
    "entityId": "439483255",
    "entityType": "Track",
    "nonce": "0x1557743295a2f826f57fc6ddfe1f9d8484600f0eec2b2833e0a9266fd4bff9ff",
    "signature": "0x5fc0a6fdcd51cda927f29d7226191544a1877ba3beb2d4f3a23bbc68ab2adb1d503aabfc2c25620aca97e88cfbeb272c87fa6780cad434a6bcceae7781e861991b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}