I just came across an interesting question: When will the 21 million Bitcoins actually be reached? Most people think it's an easy answer, but the reality behind it is much more fascinating.

The thing is – we are already quite close. Currently, over 20 million BTC are in circulation, only about one million need to be mined before the absolute cap of 21 million is reached in 2140. It sounds far away, but the protocol has been running on this plan for over 15 years.

The halvings are the key to the entire system. Every 210,000 blocks, the block reward halves – initially, it was 50 BTC per block, today it’s 6.25. This mathematical progression ensures that we will never go beyond 21 million. It’s like an built-in safeguard against inflation that Satoshi Nakamoto embedded directly into the code.

What interests me even more: Why do miners still mine at all when the rewards are getting smaller and smaller? Honestly, for several reasons. First, the financial incentive – every ten minutes, there are block rewards plus transaction fees. Second, the ideological component. Many see mining as a way to support decentralization and protect the network against censorship. And third, some view it as a long-term investment strategy – mining coins today in the hope that they will be worth more tomorrow.

The exciting part will be after 2140, when the 21 million Bitcoins are fully reached. From then on, there will be no more block rewards; miners will have to rely entirely on transaction fees. Currently, these make up about 5 percent of their income, but during a bull run, fees rise massively because more people are conducting transactions. With off-chain solutions like the Lightning Network, fees could become even more attractive in the long run.

There are also people asking: Can the 21-million limit just be changed? Technically yes, but practically? Quasi impossible. That would require all nodes in the network to agree – and Bitcoin is inherently designed to remain unchanged. Any change would likely lead to a hard fork, similar to what happened with Bitcoin Cash back then. And honestly, the community would never agree on that.

The network has already proven to be resilient. When China banned mining in 2021, miners simply moved elsewhere. That shows the system’s robustness. And the current hash rate is at an all-time high – the network is getting stronger and stronger.

In the long run, I believe Bitcoin, as digital gold with its fixed cap of 21 million, will achieve exactly what Satoshi intended: real scarcity in the digital world. When the 21 million Bitcoins are finally reached in 2140, miners and the network will probably have long since settled into a stable fee model. Until then, we still have over a century to see how everything develops.