{
  "manageEntity": {
    "action": "Save",
    "entityId": "695299",
    "entityType": "Track",
    "nonce": "0x5b6aa4920964886b80c2f8a13b602ca597668d5e56c0bd6d4a920212ec5bb20d",
    "signature": "0xaff6675112e2a33ab0deb7ab7b3c8912c38fae6e33fbdc8811843cd7458505be5dfa9271a1d967921e014f21dced09183feb03332b31a30f8846c8c18d9dea3e1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}