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by seniorsassycat 1660 days ago
The blockchain tracks bitcoin transactions not USD. The USD price of Bitcoin can change without any on chain transactions.

Market cap is last price times total supply. Only a few coins are sold each day compared to the total supply so changes in price have a magnified affect on market cap.

For example a blockchain has 10 coins and a fixed price initial sale at 1$ per coin. All coins are sold so the market cap is 10$ which refects the total money sunk into the coin.

But now someone sells their coin for 2$. The market cap is now 20$ but only 11$ we're spent on the coins.