The mystery surrounding the missing Bitcoin supply has become a crucial factor shaping the digital asset market. Experts warn that millions of BTC remain lost forever, due to forgotten keys, broken hardware wallets, or even catastrophic exchange failures. This phenomenon is driving the scarcity thesis forward. 21 million coins are fixed in supply, and losing this much adds urgency to long-term value assessment. Billions in Bitcoin are locked away from current use. Studies show between 2.3 million and 3.7 million BTC are permanently unavailable, potentially representing 11 to 17 percent of the total supply. While some estimates reach as high as 4 million BTC lost, a more alarming projection predicts over 7 million coins could be missing by the end of 2025.