Bixin.

Bixin’s pool belonged to a bitcoin wallet company in Beijing that began in 2014 as HaoBTC, with Wu Gang as its chief executive. Customers could store and buy bitcoin with its wallet, which grew out of the company’s own mining business, with sites at Mabian and Kangding in Sichuan province. In February 2017 HaoBTC renamed itself Bixin and closed its exchange, keeping its wallet and its mining poolMining poolA group of miners who share the work of finding blocks and split the rewards, so each gets paid steadily instead of rarely..

mempool.space’s count for the pool begins on 16 January 2015, but its blocks from then until April 2015 were found by another pool, TangPool: they carry TangPool’s name with HaoBTC’s after it, and pay TangPool’s address. HaoBTC’s own pool found its first block, 416,012, on 12 June 2016, with the words “Making Bitcoin More Useful”, and its blocks carried the Bixin name from 2017. In its busiest weeks, in mid-2017, it found almost one block in ten. mempool.space credits it with 5,927 blocks in all, about 0.6% of all Bitcoin blocks.

In 2017 Bixin paid its miners by pay per share, or PPS: a set amount for each piece of work they sent, whether or not the pool found a block, paid into their Bixin wallet every 24 hours. By 2018 it used its own version, HPPS, which it said shared out both the new bitcoin and the transaction fees. So each block from its own pool paid the whole reward, in its first transaction, to one Bixin address, and the pool paid its miners separately. These are payments to the pool’s miners, separate from the transactions confirmed inside the block. Bixin ran a wallet as well as the pool, but a block found by Bixin doesn’t mean the transactions inside it went through Bixin.

Its last block, 592,811, was found on 1 September 2019, and it has found none since. By 20 September the pool’s website showed its mining power as zero, and by early October haopool.com sent visitors to Bixin’s main site. No announcement that the pool had closed was found.