{
  "manageEntity": {
    "action": "Save",
    "entityId": "522731148",
    "entityType": "Track",
    "nonce": "0xd5a5d39f6cb5e735a660fc7842f6de409d7a49f7e8bcf6bc84e9a37065c40cb3",
    "signature": "0x44c5f7eba07a25df489d5c7d18145cd36ac6ad567510064501c4afc61d82b49433fd3a8a32caf8a74e9df51369ede813b53e5e796e5bcae21f95802a86d32df51b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}