According to Michael Saylor (@saylor), the total supply of Bitcoin (BTC) has reached $21 million over 21 years as of June 21, 2025 (source: Twitter). This milestone reinforces BTC's scarcity narrative, which is a critical factor for long-term investors and traders focusing on supply-demand dynamics. Traders may interpret this as a bullish signal for BTC price due to its finite supply, supporting the asset's store-of-value thesis and influencing market sentiment in both spot and derivatives trading.