{
  "manageEntity": {
    "action": "Save",
    "entityId": "727542904",
    "entityType": "Track",
    "nonce": "0x55727caa7dc60faad7188ad932cb076ba7843ee35d82719e4ff05844c9f77793",
    "signature": "0x4e6b0976daab9ae45978c565039bca3b2c4075a56d556488d3bf3429e801c980015024b524794901c8bb06a399cf8b29771dd503cff181899377b8eff9a5aafe1b",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}