{
  "manageEntity": {
    "action": "Save",
    "entityId": "837089",
    "entityType": "Track",
    "nonce": "0xda61a168001a323b8f2c2cf923eb08fc39f4b2ab9e8ed235ca69b447ec7b3148",
    "signature": "0x63cbc7def5c4305f4a71ec7f2c2145efb3cebbf953347537a1f7fa6bdbe9b7877a5377e8a5766556d8f9fbce794a99f72911894319b7c50b590a8dc302c5b1151b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}