At Token2049, held on September 18th, Ethereum founder Vitalik Buterin delivered a keynote speech titled "What Excites Me About the Next Decade." During the speech, Vitalik asserted that crypto isn't just about efficiency. He described it as "digital concrete," drawing parallels between blockchain technology and cypherpunk tools like mixnets, Tor, and BitTorrent. However, he also highlighted the unique aspects of blockchain, emphasizing its ability to create "extremely robust and persistent structures." This allows the internet to not only bypass vulnerabilities within existing systems but also construct viable alternatives. This "digital concrete," Vitalik concluded, paves the way for building digital castles in the air.