{
  "manageEntity": {
    "action": "Save",
    "entityId": "1449030213",
    "entityType": "Track",
    "nonce": "0x725c43e8fff45abb30854c1b04b190da11eec1b1f854924622b8f66368d8f209",
    "signature": "0xbfa3789721c7a5b537c05872f714a0deeddbdfc06e9e894d6e88212c401ec8c101e054e311437300f52b348ce8881340a2524ede640a6aabd5115b3b4bba76cf1b",
    "signer": "0x722b43224Dbc7d6931b3C690696EF03933374bff",
    "userId": "772126389"
  }
}