While bitcoin (BTC) is already a limited asset, Mike Caldwell’s Casascius physical bitcoins take rarity to a whole new level. Between 2011 and 2013, he endowed over 27,000 coins and bars with nearly 100,000 BTC. As we step into September 2023, a limited supply of 19,082 Casascius physical bitcoins remain in circulation, with around 41,280
