Bitcoin loses a quarter of its value in one day's trading

Cryptocurrency’s year-end rally fails as its investors are ‘finally introduced to the law of financial gravity’Bitcoin lost more than a quarter of its value on Friday as an analyst warned that investors in the cryptocurrency had finally been introduced to the law of financial gravity. In the latest illustration of bitcoin’s volatility, it slumped to below $11,500 at one point on Friday – touching $11,159 – having started the week at a record high close to $20,