By Toni Sciarretta Bitcoin and Ether retreated on Thursday amid doubts about a deal to raise the US debt ceiling and pressure from the expiration of cryptocurrency options on Friday. With pessimism, chartist analysts see the possibility of Bitcoin testing the US$25,000 range before moving back toward US$30,000. Ayron Ferreira, a chief analyst at Titanium, believes that an agreement in the US Congress will only occur at the final moment, which should keep the market tension in the coming days.