{
  "manageEntity": {
    "action": "Save",
    "entityId": "1878835216",
    "entityType": "Track",
    "nonce": "0xd2c463add3e2ef74fae26c72aac603342aafaa986145e0aa9cf47e08ff71802e",
    "signature": "0x5acc189776252b1885742b7d33b3452bf07d60f179fa339a3ab67b4868f2fc244221617278ebedc222e4363c2fe30eac790a65f1b62acaac57580b8e8ee9aae51b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}