{
  "manageEntity": {
    "action": "Save",
    "entityId": "418242595",
    "entityType": "Track",
    "nonce": "0x982819b1f5f06371ac93eceea9a6c92eb7912028ae4b6447cb980fbdf48e7f21",
    "signature": "0x1069a0bdf4560e751b6bf82a64dc5303376017e587ac940e74426eb405619abc1775119e977d1fc6a4893e05fc65d02690c59ba0ec39d1e1b898f5b77df694121c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}