Release time：2022-01-30 04:00
On Jan. 30, Sen. Elizabeth Warren, D-Mass., sent a letter to six bitcoin mining companies asking them to disclose information about energy use and sources. The letter was signed by eight senators following a Jan. 20 congressional hearing. The six bitcoin mining companies are Riot Blockchain, Marathon Digital Holdings, Stronghold Digital Mining, Bitdeer, Bitfury Group and Bit Digital.
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