{
  "manageEntity": {
    "action": "Save",
    "entityId": "534868895",
    "entityType": "Track",
    "nonce": "1785398858898860247",
    "signature": "0xc9a4081c160997ebd9c25892a2decb8f4ab86c96f3dbcfe1fb1e4c56e6f79cdd4d9d3ce09d9352f53c8f88ff6375c0658e5058cda63845e462949821ba7d21c41c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}