Bitfarms.

Bitfarms Pool belonged to Bitfarms, a bitcoin mining company founded in 2017, which then ran its mining farms in Québec, Canada, mainly on hydroelectric power. Bitfarms built the pool itself and moved its own machines to it in September 2018, after mining through AntPool for most of that year; it said the first block came about 27 hours after launch. On 16 October 2018 it opened the pool to other miners, paying them by pay per share, or PPS: a set amount for each piece of work, whether or not the pool found a block.

Each block’s first transaction paid the whole reward to one Bitfarms address. That reward is separate from the transactions confirmed inside the block. The pool found 47 blocks, from 12 September to 5 December 2018, and none after, and no announcement of its closure was found. By early 2021 Bitfarms was mining through Binance Pool, and from April 2021 through Foundry USA.

The last block credited to Bitfarms, 788,607 on 7 May 2023, wasn’t found by its pool. It is a Foundry USA block carrying the message “Bitfarms mined 21,000th BTC with hydropower on 2023-05-07”, which Bitfarms used to mark that milestone. In April 2026 Bitfarms became Keel Infrastructure, a US company, saying it was moving from bitcoin mining to building sites for artificial intelligence computing.