{
  "manageEntity": {
    "action": "Save",
    "entityId": "564561391",
    "entityType": "Track",
    "nonce": "0xb9c617818e626d1f76a2b2beea7713c62567ff670821f2e02655a29df5b8d63e",
    "signature": "0xe8912365a2eba351e6d5821e3c599652996416f39a82b038c53082d8dae8e1f20cccf9513d4e33657be51e2b94fbba888c780260b4397dbfaf85ceff61d408fa1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}