1THash.

1THash was the 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. of Valarhash, a Chinese company with mining farms in Sichuan and elsewhere. Its first block under its own name, 591,615, was found on 25 August 2019, and that December Valarhash formally launched it at an event in Chengdu, with a second pool, Bytepool. The Block called 1THash Valarhash’s “private mining pool”, mining with the company’s own machines, some of which Valarhash rented out to customers through a service called 1TMine. Its blocks were tagged “1THash&58COIN” until January 2021 and “1THash” after.

In 2020, its busiest year, it found about one Bitcoin block in sixteen. Each block’s first transaction paid the whole reward to a single 1THash address. That reward is separate from the transactions confirmed inside the block. mempool.space also credits 1THash with 338 blocks from July 2017 to September 2018 that carry the names of two other pools, BTC.TOP and CanoePool, but paid the same address as 1THash’s blocks of 2019 to 2021.

In June 2021 Sichuan ordered its power companies to cut off Bitcoin mines. On 19 June The Block reported that 1THash’s computing power had fallen 46% in a day, and the pool went from 179 blocks in May to 7 in July. After that it found only a few blocks a year; its last, 912,854, came on 2 September 2025. No announcement of its closure was found.

From 2022 its block rewards were moved together with AntPool’s and several other pools’, TheMinerMag found, and in 2024 mempool.space’s mononaut reported that one custodian, a firm that holds bitcoin for others, controlled 1THash’s reward addresses. TheMinerMag said it was unclear who was behind the arrangement.