{
  "manageEntity": {
    "action": "Save",
    "entityId": "1248156530",
    "entityType": "Track",
    "nonce": "0x1cf0960a55c09e66515ebd45c6edf49e69298b15e78ba4f1250976bb7fdf1970",
    "signature": "0xd49aca34d46786de29b3c5249d845f1c88c6a9a76f3e584a9ab69c61a8d82c6504470bd8453f2b015b8a931ccb642b726a93d888c164521c795182c5309a26b01b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}