{
  "manageEntity": {
    "action": "Save",
    "entityId": "1406821983",
    "entityType": "Track",
    "nonce": "0x726b90048c31cbe56fcd21ba8283fec8f1438637a90ca1ae16bf0b2413f42fe5",
    "signature": "0xa51becbf38e4a09b7da67940fb93dff0e8cff43ddb85f55dc6909e35e50331373fded7173c4484c90b2ebf0508c9f148fa5e85c6ba705d3c72fd3dfc841423091b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}