{
  "manageEntity": {
    "action": "Save",
    "entityId": "396237938",
    "entityType": "Track",
    "nonce": "0x2a10763b619e1b8563d59939e8c7ea7c850bdfffd2058221559a4b7cca14a30d",
    "signature": "0xf5781c4a841e0d6b50ac6f29f61deee81aba0d03999cedbc8c80b57126acc6b14496ffbe81dac9c00a6a03092d3c5afde67eba8e8f82a379de91ed2c7907c20c1c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}