According to Odaily, US digital currency concept stocks have seen a decline in the pre-market. Riot Blockchain (RIOT.O) fell by 1.83%, while MicroStrategy (MSTR.O) experienced a 1.6% drop. In addition, ProShares Bitcoin Strategy ETF also saw a decrease of 1.8%, and IShares Bitcoin Trust fell by 1.6%. This downturn in the market reflects the volatile nature of digital currencies and their associated stocks. Investors are advised to stay informed about the latest market trends and make investment decisions accordingly.