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Bloomberg News, citing people familiar with the matter, said senior officials in China reviewing the nation's foreign-exchange holdings recommended slowing or halting the buying of US Treasuries as they look less attractive than other assets. The report also said that trade tensions between the US and China may also provide a reason for the change.

Blockchains are kept in "peer-to-peer" networks that are continually updated and kept in synchronization. It would require huge amounts of computing power to access every instance of a certain blockchain and alter all its blocks at the same time. A network of tech-savvy users known as miners pour their computing power into maintaining the blockchain and verifying its transactions, ensuring that someone cannot spend the same coin again after paying for something with it.

Bill Richter

Bikeplus recommends that no more than two operators are allowed to compete for business in a city of fewer than 150,000 people, which is about the size of Oxford. Currently, Oxford has four dockless bike-sharing companies – Ofo, Mobike, Pony Bikes, and oBike – as well as a scheme that uses docks.

Big waves crash on the shore of South Korea's southern resort island of Jeju on Oct 2, 2019, as Typhoon Mitag approaches the country. [Photo/VCG]