BTC.TOP Unit Closes Mainland Service After Beijing Mining Warning

BTC.TOP founder Jiang Zhuoer said early on May 22, 2021 in China that B.TOP, a mining and equipment-brokerage business associated with the mining pool, would discontinue service to customers in mainland China. The decision was the first clearly reported operational response by a significant mining business after China’s Financial Stability and Development Committee called for a crackdown on bitcoin mining and trading.

The scope matters. Contemporaneous reporting did not establish that every BTC.TOP pool server or every proprietary mining machine had shut down on May 22. Jiang’s statement concerned B.TOP’s mainland-facing customer business. He said the company had not received a direct order from regulators but judged the additional regulatory risk unjustified because mainland customer activity represented a small part of its proprietary mining business.

That distinction separates a verified service restriction from the broader claim that Chinese bitcoin mining had already been banned or switched off nationwide. The committee supplied a high-level policy direction; detailed national implementation measures were not part of the May 22 record.

Beijing moves mining into the policy foreground

The official trigger came from the Financial Stability and Development Committee’s 51st meeting, chaired by Vice Premier Liu He on May 21, 2021. Its published account called for stronger oversight of platform companies’ financial activities and for authorities to crack down on bitcoin mining and trading, with the stated objective of preventing individual risks from spreading into society.

The language was consequential because it came from a State Council-level committee and explicitly named mining. Earlier Chinese restrictions had concentrated heavily on token fundraising, exchanges and financial institutions’ involvement with virtual currencies. The new statement placed the industrial infrastructure that secured Bitcoin—and consumed substantial electricity—inside the central government’s financial-risk agenda.

B.TOP’s withdrawal on May 22 showed that a policy signal could alter business behavior before agencies issued detailed rules. It also exposed an important institutional vulnerability: miners might operate a borderless network, but their machines, electricity contracts, hosting relationships and customers remained tied to physical jurisdictions.

Markets absorb an uncertain signal

CoinMarketCap’s May 22 historical snapshot recorded bitcoin at $37,536.63, up 0.62% over the preceding 24 hours but down 19.73% over seven days. Ether was listed at $2,295.71, down 5.55% over 24 hours and 36.90% over seven days. Those figures describe CoinMarketCap’s aggregated USD snapshot and its rolling comparison windows; they are not a single exchange’s closing auction. Cryptocurrency trades continuously, so prices and percentage changes vary with venue, currency pair, aggregation method and timestamp.

The data therefore show a market already under severe pressure, not proof that B.TOP’s announcement caused a particular move. Contemporaneous Chinese reporting attributed substantial volatility to the committee statement, but the period also contained other regulatory, leverage and market-liquidity pressures. A responsible reading is that Beijing’s intervention added a material policy risk while market participants were already reducing exposure.

What was known—and what was not

As of May 22, the verified development was narrow but significant: one mining-services operator had stopped accepting mainland business because of regulatory risk, following an explicit central-government warning. It was not yet possible to measure how much computing power would leave China, where equipment would move, or how quickly provincial authorities would act.

Later context

Research released by the Cambridge Centre for Alternative Finance in July 2021 later estimated that China accounted for 46% of global Bitcoin hashrate in April 2021. The estimate came from geolocation data supplied by four pools representing about 37% of network computing power, so it was a sample rather than a complete census. That later evidence clarifies the potential scale of the May policy change but was not available to readers on May 22 and does not expand what B.TOP announced that day.