{
  "manageEntity": {
    "action": "Save",
    "entityId": "428440",
    "entityType": "Track",
    "nonce": "0xd5511684904e3544e175684d7894b886d7cd603f7932b7318c257e8cfbe7532c",
    "signature": "0xc2108fade761d40730409e72483343e9764fc8ab00691017a6dd2122a512bd1671732117a5264124987fdf91f082e592f343cef96f7ca621290c937aa786d1561b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}