28/04/2022
When the protocol for Bitcoin was set up, the limit was set at 21 million. As a result, at some point, no more bitcoins can be mined.
When you help complete transactions on the Bitcoin blockchain, you’re said to be mining, and you can receive a reward in bitcoins. The reward halves every 210,000 blocks, which has worked out to about every four years. As of March 2022, some estimates put the total number of circulating Bitcoin at almost 19 million. This leaves a few million Bitcoin yet unreleased, which is part of why mining remains a popular activity.