{
  "manageEntity": {
    "action": "Save",
    "entityId": "336141058",
    "entityType": "Track",
    "nonce": "0x745fd356c248dd6dd7d40c3f8040490875161110a0064ad92c8cae2404e19d2a",
    "signature": "0xca28895368e22bd7b8b7c51fe12ea28a7686aab4b2c31f64203ade96be5285217409e76160fa06660171f47b81ee5bbdf7d41d22a6fa2488a61540c379d4637b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}