Bitcoin up over 3% on Thursday morning and closing in on $10,000. Other cryptocurrencies are also up on Thursday morning, as the crypto sector recovers from a slump in early February. It's hard to pin an exact reason on bitcoin's recent form. The London Block Exchange, a startup building a UK-based crypto exchange, writes in its Thursday market update: "Tomorrow is the first day of the Lunar New Year and some families are replacing their red envelopes of cash for bitcoin gifts.