{
  "manageEntity": {
    "action": "Save",
    "entityId": "1448431943",
    "entityType": "Track",
    "nonce": "0x1c3a541f9d242f185ed5ca584148c4b09e8b679b422bb3b575a2df44c61dbbcd",
    "signature": "0x165fe35395c2b85bc31610b5b546cfa73d88f69af024457548c3543c180626ab741243b049c569a233dbfacd60b23f4fa99925c9248b10eca0f7a385d1aec74b1b",
    "signer": "0xbf1f8021D15fDffe83FE44dA0b0c9CE22371359e",
    "userId": "276678878"
  }
}