{
  "manageEntity": {
    "action": "Save",
    "entityId": "187078266",
    "entityType": "Track",
    "nonce": "0x8e9b0b6a8c3b92d20e1b76b7c63306cc04af3766974b0853dfc8a3e876f60c09",
    "signature": "0x00352734d16aa3a8d61cf5d7aa1a79b4821049965da9108d1a95b887ab07f5d568805cfc4ca1009f47f03fbf0b41f762be5b2575df7a93d0f6cf076f26516e591c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}