{
  "manageEntity": {
    "action": "Save",
    "entityId": "2129252154",
    "entityType": "Track",
    "nonce": "0x3cd789be317d6c172092efba4233ae05c035c6ae1d8ffc55251ea9054856b4e0",
    "signature": "0xac375f1bef274e441c8ac10616a8a7e8b6ed9d29b3c79e5c14e2d1688ac77828658d6a9a133ce3174f38d2638655d44afb525b0a903dbc53b4ab8a22ece5aa0d1c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}