Q: Why did Satoshi choose an upper limit of 21,000,000 BTC?
A: The limiting factor is the max value of a 64 bit integer (18,446,744,073,709,551,615) and 21,000,000 BTC is represented as 2,100,000,000,000,000 satoshis.
A: The limiting factor is the max value of a 64 bit integer (18,446,744,073,709,551,615) and 21,000,000 BTC is represented as 2,100,000,000,000,000 satoshis.
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