How many BTC can ever exist?

As a result of these rounding operators, the final number of Bitcoins in circulation may be slightly less than 21 million. This will depend on the specific implementation of the Bitcoin protocol and how the rounding is handled.

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Bitcoin has a maximum total supply of 21 million coins. This is a fundamental aspect of the cryptocurrency's design, ensuring its scarcity and potential for value appreciation.

The process of mining new Bitcoins is designed to gradually slow down over time, with the total supply approaching but likely never reaching 21 million. This is due to the complexity of the mining algorithm increasing, making it more difficult to solve and earn rewards.

One factor that may prevent the total supply from reaching exactly 21 million is the use of rounding operators in the Bitcoin codebase. These operators are used to handle calculations and ensure that they are performed efficiently and accurately.