{
  "manageEntity": {
    "action": "Save",
    "entityId": "495502",
    "entityType": "Track",
    "nonce": "0xa3724bcfdf6bb6dd269d34f387bb06e33947552e868074b370ff2e1b71f9bb0c",
    "signature": "0xa904bc5fc697fdd8d73deb3e7d45529a14a9a3629efa6887a3bc3200609de25c1a3267dc0415de627b0d403f212cc6bbd9195a64256bfb86705db25855085e7e1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}