Bitcoin is nearing a significant milestone with the issuance of its 20 millionth coin, as 19,996,979 BTC have been mined, leaving approximately 3,000 BTC to reach this mark. This milestone, expected in about seven days, will mean over 95% of Bitcoin's fixed 21 million supply will be in circulation. The remaining 1 million coins are projected to be mined over the next 114 years. Satoshi Nakamoto designed Bitcoin with a 21 million cap to ensure absolute scarcity, contrasting with fiat currencies that can be expanded by central banks. This scarcity is a core value for Bitcoin maximalists, who view any change to the cap as undermining Bitcoin's "hard money" proposition. As Bitcoin's supply curve is immutable, issuance has slowed through halvings, reducing miner rewards every four years. At the current rate, 99% of Bitcoin's supply will be mined by 2035, with the final full Bitcoin expected around 2105. Miners will eventually rely solely on transaction fees, highlighting a shift in the network's economic model.