This major adjustment to how the cryptocurrency operates happens every four years.
Bitcoin has been on a downward ride over the last year, steadily trading below US$4,000. It could get worse.
The Pirate Bay is among those accused of using customers' computers to mine cryptocurrency.
Bitcoin has been viewed as a liberating path out of the corporate monetary system. But the process of 'mining' the cryptocurrency is a massive energy drain - and potential environmental disaster.
You may have imagined the blockchain would lead to a world without governments or institutions veryifying transactions, research shows that it probably won't.