{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638033331",
    "entityType": "Track",
    "nonce": "0x21e0374ae31a5927605387c921d363dfce9254db2f4fb7566a8c6f2d0120ebf3",
    "signature": "0xe30c3ae76a305fbe055d252a0eb46ebaf0b4c16f4f53029e7ba8b73a2f0901cd1cf539d8233f9097ce238359e6b3b0e5ca3761d4d4af1ee602d1d8909e3331241b",
    "signer": "0x38C35E6d98e3a8e47c96Cc5d8e8DC05C8797Ce75",
    "userId": "266305231"
  }
}