Crypto exchange Binance is shutting the bitcoin mining pool it launched in April 2020, with the computing power directed at the service down nearly two-thirds from the end of last year.

Binance Pool had an estimated 26 exahashes per second, or 2.3% of Bitcoin’s network, in December, according to Hashrate Index. Its latest table puts the pool at about 9.2 EH/s, under 1% and ranking 11th. That works out to a decline of roughly 65%.

One exahash per second is a quintillion guesses every second at the puzzle that earns a bitcoin block. A mining pool combines work from many machines so their owners receive regular payments instead of waiting to find a block alone.

Binance used a payout model known as full pay-per-share, or FPPS, paying miners for their work and taking on the risk that the pool found fewer blocks than expected.

The exchange said earlier this week that Binance Pool, Pool Savings, Cloud Mining, its transaction accelerator and related services will close at 7 a.m. UTC on Nov. 10, citing an ongoing review of its products and services. It gave no financial explanation for the decision.

Miners have about four weeks to direct their machines elsewhere. After the cutoff, Binance will stop crediting mining shares, the records of work used to calculate payouts. Pool Savings users must redeem their positions, while anyone awaiting a final payout should complete required identity checks by 11:59 p.m. UTC that day.

Pool pages will disappear permanently on Nov. 24, giving customers another two weeks to download records and check payout status.

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