{
  "manageEntity": {
    "action": "Save",
    "entityId": "209281",
    "entityType": "Track",
    "nonce": "0x121fcc29192e928c954dd0d6b4c799700cbfae4b586fd9e391e8141b85cbfa78",
    "signature": "0xe271512a95876639c1223690295d29d38319bc84b1a6c53552b0ade0a3d511df126fba41177220e68404ee3e63acc9a74fc591e3c730ef97fd9456acc769379e1b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}