{
  "manageEntity": {
    "action": "Save",
    "entityId": "666139",
    "entityType": "Track",
    "nonce": "0x851cd15add035fb46146fbc04565c627909c1d994167ccc675cf185ccb3f87fb",
    "signature": "0xba525cf3226a8a51f22dd1f9607e9263c7c4dda1115cc921ecefe7e5b9854f6b4394dc966205146ee3284ccf35010443bb89550080bb20bbc781ca50f0f12dc01c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}