{
  "manageEntity": {
    "action": "Save",
    "entityId": "388945",
    "entityType": "Track",
    "nonce": "0xd68d5288c3f69d89102624dd4843b5fc2f65fd30b7f64de0062607273216a059",
    "signature": "0xc8e9550f51e06533256aae2e9f49242eb50abaddbe08f1cfc8666ef3220e25e95b094e455070b2ab138a7d5e4ff453f4569d8f57d9d20287b9d30a377250f0521c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}