{
  "manageEntity": {
    "action": "Save",
    "entityId": "354980660",
    "entityType": "Track",
    "nonce": "0x5f629b1429ae44f9152eb18b2a555ee29a2634f3d25c06e37412e9a67050ae0f",
    "signature": "0xa4c9d59fd022db22b40a13750cbed6d97fa6a27755821996a65b8bddcdca8dcb76b5203c9fa8190ec487764984c3c3327d0b024d22e8200a85226bae9d71bc781c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}