Jan 22 (Reuters) - Bitcoin dropped 5.6% to $34,448.94 at 18:10 GMT on Saturday, losing 1,878.27 from its previous close. Bitcoin, the world"s biggest and best-known cryptocurrency, is up 1.8% from the year"s low of $34,000 on Jan. 22. Ether , the coin linked to the ethereum blockchain network, dropped 8.4% to $2,352.72 on Saturday, losing $189.64 from its previous close.