{
  "manageEntity": {
    "action": "Save",
    "entityId": "214119723",
    "entityType": "Track",
    "nonce": "0x7d751595c4fde4a1183b5ee2e4a5a3446629eb45a59250468e9ab46e8b77d843",
    "signature": "0xa0819b2cdd468528a7371d5d5992d4a623ed10cbe05fc4c88fa31b41c8d32e34454bc306d47947d62706b524332a9598612f5cc4e5ced66c5cdc6789b9a8a3241b",
    "signer": "0xDd320Ea9a099A13D44fB85307EafaF14e61fe55F",
    "userId": "820149711"
  }
}