{
  "manageEntity": {
    "action": "Save",
    "entityId": "665737350",
    "entityType": "Track",
    "nonce": "0x447d57957fa9955943f67541aeba099e3fc619525c918451d2f5d9962633464e",
    "signature": "0x19c75a8a993d6301bee9d3aa9e9681ee0c6829f1f82141b897ad7972b5e563e21b0cde8dff62da165aecc69798a8fdbacf0893683bacbe6385b824b9e7b090491b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}