{
  "manageEntity": {
    "action": "Save",
    "entityId": "577178014",
    "entityType": "Track",
    "nonce": "0xe48a86f898c8fe3f6797d04b8c6b643d52a7d2fc758e3defb1e7bae9391b5a75",
    "signature": "0xd1e24a540ae45a05dd65be48049fdeb1bf1b7a6424b87eea7023715c5e5c97220a02e06bfca261c4be7947fd0cde50df8cf406911b31b931669267790aa10b6a1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}