Bitcoin climbed back above $40,000 on Wednesday for the first time this week, before edging off its highs, as recent volatility in the cryptocurrency market showed few signs of dampening down. Bitcoin jumped as much as 6.5% to $40,904, before easing back to around $38,797 at 11:45 a.m. Eastern time. Smaller coins, which tend to rise and fall with the largest cryptocurrency, also gained, with ether climbing more than 7.5% to above $2,915 earlier in the day. Still, bitcoin is down 30% this month, and has lost over 37% from its record high of almost $65,000 hit in April. It has gained over 40% this year, however. "Cryptocurrency market volatility is not going away anytime soon," said Edward Moya, senior market analyst at OANDA. "Right now the aftermath of the crypto plunge is having everyone dig a little deeper to try to find out, are the ESG and regulatory concerns going to pose a major risk in the short term?" Bitcoin"s most recent slump has come amid concerns over the environmental impact of bitcoin production, an energy-intensive process known as mining, and as China has cracked down on the emerging sector. read more Bitcoin touched a low of $30,066 last week, its weakest since January, in highly volatile trading. BlackRock (BLK.N) Chief Executive Larry Fink said on Wednesday the world"s largest asset manager is studying cryptocurrencies like bitcoin to determine whether the asset class could offer countercyclical benefits. read more For now, it is too early to determine whether cryptocurrencies are "just a speculative trading tool" Fink said at the company"s annual meeting.