{
  "manageEntity": {
    "action": "Save",
    "entityId": "435699",
    "entityType": "Track",
    "nonce": "0x4e2b010be6e957f06a8ae38f8a7f074b9dbc4367d84b80e79148bb181a5d8ccf",
    "signature": "0xb477db8f86cf6129a54c9ce39964b7cd2d8e6c3cd3487cd8ca98fccfea486d6d4beba7340b69010ea66d791c04aa1fc35fb8427fa487bfa8fcb384107d9db91f1b",
    "signer": "0xbb3E94A6Ca25f3CAF1B8487768C074bE200e6381",
    "userId": "277460613"
  }
}