This Darknet Diaries episode features an interview with Joe Grand, a hacker known for his work in hardware hacking and his contributions to DEF CON. The conversation traces Joe's career, starting with his early explorations of computers and phone systems, his involvement with the L0pht, and his subsequent work on the Discovery Channel show "Prototype This." A significant portion focuses on Joe's creation of DEF CON's iconic hackable badges, which spawned a large community. The interview concludes with a discussion of Joe's recent viral video demonstrating a fault injection attack on a Trezor hardware wallet and the subsequent challenges of dealing with impersonators. The episode highlights the evolution of hacking culture and the unexpected consequences of online fame.