Comment: Yeah you are right.

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Yeah you are right.

Your first observations is correct; a single bitcoin can be divided into fractions; the smallest fraction of a bitcoin is known as a satoshis.

No, they are no divided like an ameoba.

Like you said the max number (21 million) cannot be change.

"We’ve moved beyond the Mises textbook. We’re running in the open market." - Erik Voorhees