Poolin.

Poolin was founded in Beijing in November 2017 by Zhibiao “Kevin” Pan, Fa Zhu and Tianzhao Li, who had worked at Bitmain, the mining-machine maker, and helped set up its pool, BTC.com. Poolin’s Bitcoin pool opened in July 2018, and at the end of September 2019 it was, for a time, the largest in the world; at its peak it had nearly a fifth of Bitcoin’s mining power. Its company, Poolin Technology Pte. Ltd., is registered in Singapore and owned by Kevin Pan. In 2020 it ran the website where pools said whether they would support TaprootTaprootA 2021 upgrade that added Schnorr signatures and addresses starting bc1p, making complex payments cheaper and more private., an upgrade to Bitcoin’s rules.

Since the end of November 2022 Poolin has paid all its Bitcoin miners by full pay per share, or FPPS: a set amount for each piece of work they send, paid once a day whether or not the pool finds a block. So each Poolin block’s first transaction pays the whole reward to one Poolin address, and the pool pays its miners separately. These are payments to the pool’s miners, separate from the transactions confirmed inside the block. Poolin also runs pools for other coins, such as Litecoin; the blocks here are Bitcoin’s only.

In September 2022 Poolin stopped withdrawals from Poolin Wallet, where customers earned interest on their coins or borrowed against them, saying it had “liquidity problems”; it said new mining earnings would still be paid daily. It then replaced users’ balances with IOU tokens, one kind for each coin it owed. On 22 July 2026 Poolin Technology and two affiliated companies that ran mining sites in Texas filed for Chapter 11 bankruptcy in New Jersey, listing about $163.7 million owed to Poolin Wallet’s customers. The pool itself has kept running: it still finds a few blocks a month, and its help centre was still posting pool news in 2025.

Researchers who track mining poolsMining poolA group of miners who share the work of finding blocks and split the rewards, so each gets paid steadily instead of rarely. link Poolin to AntPool. In 2024 the researcher 0xB10C found that the block templates Poolin sent its miners, the lists of transactions to work on, were 99% the same as AntPool’s, and he counts Poolin among the pools he calls “AntPool & friends”, which seem to pass on AntPool’s work under their own names; he notes that it isn’t proven one company runs them all. TheMinerMag and mempool.space’s mononaut found Poolin’s block rewards being moved together with AntPool’s by a single custodian in 2023 and 2024. Poolin hasn’t said what the arrangement is.