{
  "manageEntity": {
    "action": "Save",
    "entityId": "688421819",
    "entityType": "Track",
    "nonce": "0x152e9bcf7f1025a7da476753284aa3e2cb715b13484450409c1d34f2e0dcdd32",
    "signature": "0x81e305a989f1b6fa83e1cfde9e4ada1bb8d34e99201a4ccd6b91a98cd60646200130e17794f75e04f16d533cb8aa217e87f2e02c24a90ecb33a572f9af7bbef81b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}