What happens to the bitcoins earned by miners after a successful block mining operation

Upon successful mining of a block, miners are rewarded with newly minted bitcoins. Currently, the block reward stands at 6.25 BTC per block, which is halved roughly every four years in a process known as halving. This halving event reduces the amount of new bitcoins entering circulation by 50%. As of now, more than 18.7 million bitcoins have been mined out of a maximum total supply of 21 million. It's estimated that the last bitcoin will be mined around the year 2140.

Once a miner receives their block reward, they can choose to hold onto their bitcoins as an investment, sell them on a cryptocurrency exchange for fiat currency or other digital assets, or use them to make purchases from merchants that accept bitcoin as payment. Additionally, miners can earn transaction fees for validating and recording transactions on the Bitcoin blockchain. Transaction fees are paid by the sender of a transaction and are included in the block reward. As the block reward decreases over time due to halving, transaction fees will likely become a more significant source of revenue for miners. However, it's worth noting that not all mined bitcoins will remain in circulation, as some may be lost due to factors such as forgotten private keys or deceased holders. According to data analytics firm Chainalysis, roughly one-fifth of all coins mined to date are estimated to be lost.