{
  "manageEntity": {
    "action": "Save",
    "entityId": "857738269",
    "entityType": "Track",
    "nonce": "0x6e8e0aafb1a844c4e4d1ffa85102f824fe3c7cbfb36a844d3da25bcf62918da8",
    "signature": "0x595cd042a7240dfe1f882c8055b0e07a82f127cfd8714f102ee2ceb981a96aaa352547e5a24a0e9a29382dfe91027a2052a19739a2f1aba258a7802236b5bdaf1c",
    "signer": "0xE69EE1e71C27cDfa05141f1DCE82bF0231AD05f1",
    "userId": "933842159"
  }
}