Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Bitcoin Stack Exchange is a question and answer site for Bitcoin crypto-currency enthusiasts. It only takes a minute to sign up.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
Reading the original Nakamoto paper, I cannot see any discussion or reference to the upper bound on the number of bitcoins.
Where is it specified that at most 21 million bitcoins will be minted?
Every 210000 blocks, the reward for mining that block halves. It started out at 50BTC and now it's at 25BTC. Eventually it'll get to zero and no more bitcoins will be made.