{
  "manageEntity": {
    "action": "Save",
    "entityId": "1689157718",
    "entityType": "Track",
    "nonce": "0x88732f3fddf34478fa76b3276580d5a18ad9b618dfe859f19ac7a2b7bb261e4e",
    "signature": "0xe3aa9c3e11dc50efbeea39706717b6075021f09bcbc8e039d193befda531d4634615db0f22d752d0352ef6996064c1441e84101d523639ad3e113c860106285c1c",
    "signer": "0x9d71fCCB64e7575736E44460e714Ce0fcd69cf08",
    "userId": "16198441"
  }
}