{
  "manageEntity": {
    "action": "Save",
    "entityId": "905556253",
    "entityType": "Track",
    "nonce": "0x1353984fb16778e0c0c750c87b1695433ce4bde1660ece6445458f64dd5e82de",
    "signature": "0xbb1eacd0a17e46429059f79f46fcf8b523cd77c43b98de887a651e33bb4e889a42e4481866cf42dbe2f7ee6c0b9c8a75fb7a0ce98cc3a8cc9ca9f32c0e4a9e4e1b",
    "signer": "0xF66719AC0E8463f8c9660B4412B4972e1dB48183",
    "userId": "57021"
  }
}