Bitcoin and ethereum posted their largest one-day drop since March last year on Wednesday, with losses in the market capitalization for the entire cryptocurrency sector approaching $1 trillion. The sharp declines came after China banned financial and payment institutions from providing cryptocurrency services. Bitcoin dropped to $30,066, the lowest since late January. It was last down 22% at $33,502 . The most popular cryptocurrency posted its largest one-day loss since March 2020. Ethereum fell to as low as $1,850 , its weakest level since late January as well. It was last down 28% at $2,439. Ethereum"s one-day losses were the biggest since March last year.