{
  "manageEntity": {
    "action": "Save",
    "entityId": "658031991",
    "entityType": "Track",
    "nonce": "0xf7420a5d0e6291cc03e7de712042d0260b4b6649a43693b346a792d46ae6a36d",
    "signature": "0xb990a9921761c4f2af64eeda0f81d04d7d1ce607e8309ed26b848bda0703e0513b8e5372288ace35d0d237a672e70a4505d0cd9c7a4fedd8b263918b7ce6d1bb1b",
    "signer": "0xcBFBf860488b647E167A7020ac01A0A0c34Bf981",
    "userId": "4601100"
  }
}