{
  "manageEntity": {
    "action": "Save",
    "entityId": "1475041144",
    "entityType": "Track",
    "nonce": "0x5d5af50abee4629cbce682df67a69c1fd5bdc9b3902730d62f55fcbde6c60b1b",
    "signature": "0xfbab69667bab1511cbfd60ae61dcdbbe38f1502f32ada3eef4159f9ed1a5caf843f44e0c41bb9de24c1f0ce35aafadaf6e98016093647414e13ded8aa06cd6221b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}