{
  "manageEntity": {
    "action": "Save",
    "entityId": "677373",
    "entityType": "Track",
    "nonce": "0xeab6aec28ea0d35ab0236d2346fb9bebff714450d51ff73014d7113c16375d69",
    "signature": "0xf9c128634fce200cf73808934a637a0ea85b58cf6c798de30b034dc53d9667202f8f332f23012a7c9aa50c7bf0ef6013ba9671c4f1118f33d7f1e1465931c76b1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}