http://invest5kxmpe4fuurn3yph6kjeihscqptofnviurkueviu2gfwvt5lyd.onion/ios-bitcoin/index16.html
This is a rare quality for any man-made structure, whether physical or digital. Until the 20th century, most “secure” man-made facilities were laborious to construct, and relatively easy to penetrate with the right explosives or machinery; castles fall to siege warfare, bunkers collapse under bombing, and secret codes are breakable with computers.