{
  "manageEntity": {
    "action": "Save",
    "entityId": "1199851275",
    "entityType": "Track",
    "nonce": "0x821d0bfa0fd389419ddfc487e7cec25fc387be6b2856f8707870cc5434d90d1e",
    "signature": "0x5f122912df5b157b55fc80c30d5ef99df41561cb44194c9178b56d90f67a4e3a5cc8d2c8fd9b6b72202478c7850624070c357ba858bd02c456bb901c8ae2438f1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}