Denys Klimchuk, founder of AsicBoost and ASIC miner engineer

Denys Klimchuk was born in 1981 in Moldova. At eighteen he started fixing mobile phones, later he opened the CDMA CLUB service centre. The approach has stayed the same since: a meter tells you more than a guess.

In 2017 he switched to mining hardware. A year later he moved to Kyiv and opened the ASIC CLUB service centre, where he repaired Antminer hash boards and power supplies. In 2022 he moved to Spain, to Valencia, and a year later was repairing miners again, this time here. In 2026 he founded ASIC MINER SLU. The company site is asic.es.

He works with what sits behind the web panel: frequencies and voltages per chip domain, autotuning, how a board behaves under load. Factory spec numbers say little here. The real picture comes from the miner log and the hash board sensors an hour into the run, once everything is hot.

AsicBoost is his firmware brand for Bitmain Antminer, and he develops it alone: architecture, builds for each model, the web panel, autotuning. The catalogue holds more than 45 models of the S19, S21, T19, T21 and L7 series on two algorithms, SHA-256 and Scrypt. The developer fee is 2.8 percent for any model and any mode.

Electricity in Spain is expensive, and that shapes the workshop: a machine at around 30 J/Th is worth optimising rather than running as is. The firmware has one job here: pull more hashrate out of the iron already in the rack, on the same kilowatt. Repair experience matters more than programming experience for that. Anyone who has seen a hash board after a year at limit frequencies sets autotuning numbers more carefully.

Besides the firmware he handles the technical side of the shop: he checks machines before shipping, works through failures, writes the documentation. The guides on unlocking the AML board over UART, the decoding of Antminer logs, the manufacturer write-ups and the chip tables on the site were written by him. He runs support himself on Telegram, with no call centre and no ticket system. Videos go on YouTube.

Short version, by dates and cities.

• 1999
  MoldovaAt eighteen he started repairing mobile phones. Later he founded the CDMA CLUB service centre.
• 2017
  CryptocurrenciesMoved to mining hardware: first as an owner of machines, then as the engineer who repaired and tuned them.
• 2018
  KyivFounded the ASIC CLUB service centre. Repair of Antminer hash boards, power supplies and control boards became his main work. The ASIC CLUB site
• 2022
  ValenciaMoved to live in Spain.
• 2023
  Workshop in SpainWent back to repairing mining hardware, now for the Spanish and European market.
• 2026
  ASIC MINER SLURegistered the company in Spain. The company site is asic.es.

The same hands fix the boards and build the firmware, so each line feeds the others.

• Repair and diagnosticsAntminer hash boards, control boards, power supplies and cooling. The log and the sensors first, the soldering iron after.
• AsicBoost firmwareOverclocking, undervolting and autotuning for 45 models. Built and tested on real machines, under load.
• Log readingfind 0 asic, autotune fail, CRC: the log lines usually show which board is failing and why.
• Pre-shipping checksEvery machine goes through the bench: hashrate and temperatures under load.
• DocumentationFlashing guides, AML board unlocking, chip tables and knowledge base handbooks.
• Support and videoHe answers Telegram questions himself; guides with real hardware go out on YouTube.

The firmware goes onto the machine with full rights and runs unattended for months. The question "what is inside" is a fair one. I answer it in my own name.

• As the sole developer and brand owner of AsicBoost, I take personal reputational and technical responsibility for every line of code in all official releases of our software.
• The software is distributed with closed source code (proprietary) for the sole purpose of protecting intellectual property, safeguarding our energy-efficiency algorithms, and preventing malicious third parties from creating dangerous modifications that could damage the hardware.
• All official files available for download on the asic.es domain undergo rigorous testing, are digitally signed, and feature verified checksums (SHA-256) in the downloads section. The code is completely free of undocumented functions or malware. The development fee (DevFee) is strictly fixed at 2.8 percent, transparent, and fully visible to the user.

How to check the file before installing

You do not have to take my word for it, the hash takes five seconds. Download the build from your model page, compute the sum and compare it with the one printed next to the link. If it does not match, the file came from somewhere else. Do not install that one.

Whose signature is on it

Behind the firmware stands a company registered in Spain, with a registry number and an owner who has a first name and a surname.

Legal entity

ASIC MINER SLU

Founded

2026

Owner and developer

Denys Klimchuk

The same addresses sit in the page markup through sameAs, so search engines can see it is one and the same person.

• LinkedInProfessional profile and work record in the EU
• Google for DevelopersProfile in the Google Developer Program
• GitHubDeveloper profile, the same handle bgasolder
• BitcoinTalkHandle bgasolder, on the forum since December 2017
• ASIC CLUBService centre, founded in Kyiv in 2018
• TelegramAsicBoost support, he answers in person
• YouTubeVideo guides on flashing and repair

Knowledge base materials on asic.es that he wrote and checked himself.

• HandbookASIC miner: a full guide to cryptocurrency mining hardware33 sections: how it works, algorithms, picking one for your tariff, the site, repair, glossary
• HandbookBitmain chips in Antminer minersFifteen SHA-256 generations from BM1387 to BM1370, chips per board and domains
• ManufacturerBitmain: the company, the chips and Antminer minersHistory since 2013, 58 models in the catalogue, cooling, firmware, servicing
• ManufacturerMicroBT: the company, the chips and Whatsminer miners48 models, in-house chips, set against Antminer on efficiency and repairability
• ManufacturerCanaan: the company, the chips and Avalon miners22 Avalon models, a look at the rated modes and the real numbers from the bench
• AlgorithmThe SHA-256 algorithm: coins, ASIC miners and specifications136 models with hashrate and efficiency, pools, picking a machine, 20 FAQ questions
• GuideInstalling AsicBoost firmware with HashCore ToolkitFlashing a fleet over the network, install errors explained, what to do on a rollback
• GuideUnlocking the AML board over UARTStep by step: which models need unlocking, the wiring diagram, U-Boot commands
• GuideStock firmware and SD images for Bitmain AntminerFactory builds for 116 models with dates, versions and checksums
• ReferenceBitmain Antminer logs and errors: what they meanfind 0 asic, autotune fail, CRC, voltage too low and dozens more lines from the log