Bitcoin supply squeeze myths and Marathon Digital’s BTC accumulation

The illusion of the 21 million cap

The 21 million maximum supply is a fiction. While Satoshi Nakamoto hardcoded this limit, the effective circulating supply stays between 15.8 and 17.5 million coins. Analysts at Ledger and Unchained put the number of lost bitcoins closer to 3.8 million, which places the effective circulating supply between 15.8 and 17.5 million coins instead of the headline 21 million cap. This gap widens because coins age into "ancient" status faster than miners produce new ones. In 2025, more than 566 BTC per day entered this category, while miners only produced 450 BTC per day after the 2024 halving. You know the headline cap does not dictate price discovery. Lost coins like the 1.148 million BTC from Satoshi’s early mining sit idle. Human error also removes supply, like the 8,000 BTC lost in a landfill by James Howells or the 7,000 BTC locked behind Stefan Thomas’s lost IronKey password. In 2026, 46 percent of the total Bitcoin supply is underwater. Recent data shows that 43 percent of all Bitcoin in circulation has not moved in three or more years. This includes coins that users deliberately send to "burn wallets" with no known private keys. Coindesk reports that as much as 5.6 million BTC has not moved in over a decade.

Why the four year cycle broke

The 2024 halving reduced the block reward from 6.25 to 3.125 BTC. This event no longer dictates the market rhythm like it did in 2012, 2016, or 2020. In 2012, the price was $12.20; in 2016, it was $651; and in 2020, it was $8,821. Bitcoin traded at $64,000 on the 2024 halving day. Spot ETFs launched in January 2024 changed the market structure by providing institutional liquidity. These inflows often outpace the creation of new coins. In January 2026, Bitcoin dropped 15 percent in a single week, hitting $75,644 on Coinbase. This move pushed the price below the average ETF cost basis of $84,000. Does the presence of institutional liquidity effectively kill the scarcity premium? The 2024 halving triggered a 256 percent price rise in the first quarter. The next reward reduction happens in 2028 at block 1,050,000. By 2028, annual issuance will drop to roughly 82,000 BTC per year.

Mining margins and corporate hoarding

Marathon Digital holds 50,000 BTC in its treasury. The company uses a strategy of mining and market purchases to build this reserve. In March 2026, Marathon sold 15,133 BTC for $1.1 billion to fund debt repurchases. This sale included the repurchase of $367.5 million in 2030 notes and $633.4 million in 2031 notes.

The 2024 halving pushed the average production cost to $37,856 per Bitcoin. Mining difficulty rose 40 percent in 2024, even as hash price fell 60 percent. Smaller miners struggle with these higher costs, but Marathon operates with 54 percent site ownership to mitigate the impact. I find the focus on miner profitability ignores the massive scale of institutional accumulation. Public miners average 4.5 cents per kWh of energy. The network efficiency reached 34W/T in 2024, an 8 percent improvement. The value of 50,000 BTC could finance the construction of the Burj Khalifa more than three times over. The next reward drop to 1.5625 BTC arrives in 2028. Marathon operates with a 60.4 EH/s hashrate.