{
  "manageEntity": {
    "action": "Save",
    "entityId": "520804479",
    "entityType": "Track",
    "nonce": "0x66816fc94b376ac8ba63db49c240d21b9b0c7217aa5ff868addcb067af9516a5",
    "signature": "0x86fd264daa9ed60fdaac4fbf8da0fbb90b913ed26326c2113b947c0a2ddcd045516f7db53d5819e5c03f5a4450d99fd5938ec8d36ef2e2a17bc8dce2244f23661c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}