{
  "manageEntity": {
    "action": "Save",
    "entityId": "1018805918",
    "entityType": "Track",
    "nonce": "0x645fdfee650bf1b1c7f39282414fffef0edaf0cda4bba290863f359afac07a48",
    "signature": "0xcca24cf5f452460ac21e3bb4786517107b1771b3453f71f4d22f606b5522a991074de04f3b3a2a486d1af19e6f1bbd2f0ec1f1d9aacd02234ef2e86ccbf9ddc51b",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}