Sylwester Suszek, known as Poland's "Bitcoin King," was a pioneering cryptocurrency entrepreneur who co-founded BitBay, one of Europe's largest exchanges, in 2014. Starting with Bitcoin mining operations in Katowice, Suszek built a platform that reached a $1 billion valuation with nearly one million users and $20 billion in monthly trading volume before relocating to Malta in 2018 to navigate regulatory challenges. Despite controversies and allegations surrounding his business origins, Suszek accumulated significant wealth, investing in luxury real estate and diverse business ventures. His mysterious disappearance on March 10, 2022, remains unsolved, with investigators suspecting foul play. The case, now under investigation by renowned private detective Krzysztof Rutkowski since November 2024, continues to captivate public attention and serves as a cautionary tale about risks in the cryptocurrency industry.