Waterworld30 Nov 2023 08:23
"in simple terms, miners audit transactions in exchange for an opportunity to acquire the digital currency. but they compete against each other to complete that audit first - meaning the same transaction is being worked on many times over, by multiple powerful and power hungry computers.
"you have millions of devices around the world, constantly competing with each other in a massive game of what i like to describe as 'guess the number'," mr de vries told the bbc. "all of these machines combined are generating 500 *****illion guesses every second of the day, non stop - that is 500 with 18 zeros behind it." this method is known as "proof of work". but a change to the way bitcoin works could cut the electricity use and hence water consumption dramatically. the major cryptocurrency ethereum did this in sep 2022, moving to a system called "proof of stake", reducing its power-use by more than 99% in the process. that may not be straightforward though, according to prof james davenport, of the university of bath. "[it was] only possible because the management of ethereum is significantly more centralised than that of bitcoin," he told the bbc. nonetheless, others say the findings of this research are worrying. dr larisa yarovaya, associate professor of finance at the university of southampton, she said the use of freshwater for bitcoin mining, particularly in regions already grappling with water scarcity, "should be a cause for concern among regulators and the public"."
https://www.bbc.co.uk/news/technology-67564205