The Prague Congress Centre was the hub of the Devcon IV congress for developers, the main topic of which was cryptocurrencies. This event brought a number of new technological devices to PCC, such as 3D printers, crypto mining farms, IOT buttons, etc. It was the most technologically demanding event of the year. Congress participants put the IT technologies of the Prague Congress Centre to the stress test. The event required a continuous transmission of 2,000 Mbit/s Internet to the building, of which 1,300 Mbit/s via Wi-Fi for 4,000 connected active devices. The Ethereum Foundation hosts Devcon with the goal of educating and empowering the community to create decentralised applications and bring community culture to the world.