{
  "manageEntity": {
    "action": "Save",
    "entityId": "1559217963",
    "entityType": "Track",
    "nonce": "0x2bca9ee1ac4e899846f77a9ce95352eae66f69376e2698fa3011c9abbb9f336a",
    "signature": "0x8dfe817b51ba52859675f12aa43729a4c1d509602fa98b0ed68f8bd8b9f4d0cf50b51a686ffc0fd5e7e5027c0fb455330d943e7bb125c5144d147a869026ecff1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}