{
  "manageEntity": {
    "action": "Save",
    "entityId": "451598087",
    "entityType": "Track",
    "nonce": "0xb3b9b6e2ab1d89a6d551a0f35ec8eec092a6e2d9a0831fce773d3466a2b1cc2a",
    "signature": "0x43c4081a8e276de837f21960805d174fb37c414344688fc494575f40cc1a2faa051cf8f3b925daffd4f25437d3609e551ef53b806e2b6be925551c1c61a59ef81c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}