{
  "manageEntity": {
    "action": "Save",
    "entityId": "1506119399",
    "entityType": "Track",
    "nonce": "0x0521be03bca839c1eac82a43aae8c9b7b70b4c9856b4f94171b64393d23fda85",
    "signature": "0x7f4f6fdf94156c455fc8120939f05f34749eec8c41a4a8159603c3a2e46f52ce7d2a51ece5ffb93259b098043813e67cfb88f07624c7f454a96a9e6ffd993a7d1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}