{
  "manageEntity": {
    "action": "Save",
    "entityId": "522480140",
    "entityType": "Track",
    "nonce": "0xaac3aa5d30c34813654d533c8d1ecca4bb44dd293363501a736575140429bbe0",
    "signature": "0xf8730c1c843db9b7a09292457da6c6e1be1c9da53ec546fe959e93c80c69b8047195d767e5c229d843000bea653d53fb3f6c44e41dea58c5d05e59d56f85b8e11b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}