{
  "manageEntity": {
    "action": "Save",
    "entityId": "39374090",
    "entityType": "Track",
    "nonce": "0x0507147256b8422b88cccb767e4c0530e9bb34a58177fc717ae0cd87c76b6f4a",
    "signature": "0xaeca6aacd632c8c8ad77ea6dbe8c0d5ea9342ec78594d209aba2a854b2d9b5cb5881a4f1dcff10f5a55fa405ea651cc6b588c2c744f3c69f381e70c97cf9cd371b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}