What Is Braiins? The First Bitcoin Mining Pool and Its Firmware, Explained

Braiins is a Prague-based Bitcoin mining company, and the easiest way to understand it is as two products under one roof: Braiins Pool, the world's first public Bitcoin mining pool (it launched in 2010 as Slush Pool), and Braiins OS+, custom firmware that squeezes more efficiency out of ASIC miners. There is no Braiins coin and no token — Braiins makes money from mining fees, not from a cryptocurrency. What makes it worth understanding is history and technology: it has run continuously longer than any other pool, and it co-created Stratum V2, the protocol trying to pull Bitcoin's block construction back out of the hands of a few giant pools.

Who's behind Braiins

The story starts in late 2010, when Czech developer Marek "Slush" Palatinus launched the first publicly available Bitcoin mining pool (announced November 2010, first block found that December), originally called the Bitcoin.cz pool and later known as Slush Pool. Before pools existed, solo miners either found a block or earned nothing; pooling let small miners combine hashrate and share rewards proportionally.

Palatinus is the same person behind SatoshiLabs, the company that shipped the Trezor — the first Bitcoin hardware wallet. Braiins and SatoshiLabs grew from the same early-Prague Bitcoin scene and remain closely linked in spirit, though they are separate businesses. Braiins Systems took over day-to-day operation of the pool with a majority stake in 2013, and in 2020 it acquired the remaining ownership from Palatinus, freeing him to focus on SatoshiLabs and Trezor. The pool was rebranded from Slush Pool to Braiins Pool in 2022, unifying it with the firmware business under one name.

"Braiins" can refer to the company, the pool, or the firmware; the three are designed to work together, and this guide covers all of them.

Braiins Pool: how it works and what it costs

A mining pool coordinates many miners, combines their hashrate, and distributes the Bitcoin they collectively earn. The important differences between pools are the reward model (how your share is calculated) and the fee.

For most of its life Braiins Pool used a distinctive score-based reward system, designed to reward loyal, consistent miners and penalize "pool hopping." In December 2023 it retired that system and moved to FPPS (Full Pay-Per-Share), now the industry-standard model for larger pools. Under FPPS you are paid a steady, predictable amount for every valid share you submit — covering both the block subsidy and your proportional share of transaction fees — regardless of whether the pool actually finds a block that day. The pool, not the miner, absorbs the variance. This is what home miners generally want: smooth income instead of lottery-style payouts.

On cost, Braiins Pool charges a 2% pool fee under FPPS. The notable wrinkle is that miners running Braiins OS+ firmware get that fee effectively rebated to 0% — a deliberate incentive to adopt the company's own firmware. Braiins Pool was also the first pool to offer Lightning Network payouts (rolled out in early 2024), and those Lightning payouts have no minimum threshold and no fee, which is a real advantage for small miners who would otherwise wait a long time to hit an on-chain payout minimum (around 0.001 BTC). It is a Bitcoin-only pool and publishes transparent, verifiable statistics.

Braiins OS+: firmware and autotuning

The second product is Braiins OS+, custom firmware that replaces the stock software on supported ASIC miners — primarily Bitmain Antminer models. Stock manufacturer firmware is closed and conservative; third-party firmware unlocks tuning that the factory settings leave on the table.

The headline feature is autotuning. Every ASIC chip in a miner is slightly different — some tolerate higher clocks, some run more efficiently at lower voltage. Braiins OS+ profiles chips individually and adjusts frequency per chip and voltage per voltage domain, finding a better operating point for each one rather than running the whole board at one blunt factory setting. The practical payoff is watt-level power targeting: you can tell the miner to hit a specific power draw or efficiency target, and it tunes to get there. For operations paying for electricity, joules-per-terahash is what matters, and autotuning is where Braiins OS+ earns its keep. (Reported efficiency gains vary by hardware and how aggressively you tune, so treat any single headline percentage with caution.)

Braiins OS+ is built on an open-source base, which appeals to miners who distrust closed factory firmware. It carries a small development fee (roughly 2%, varying by model) taken as redirected hashrate — and that fee is waived when you mine on Braiins Pool, tying the two products together. Braiins OS+ is also the production firmware with native Stratum V2 support.

It is worth noting the competitive context. Braiins OS+ is not the only custom Antminer firmware — alternatives such as VNish and LuxOS are widely used, and each makes its own trade-offs on features, supported models, and fees. What sets Braiins OS+ apart is less any single efficiency number (those move around by hardware and tuning aggressiveness) and more its combination of an open-source lineage, the tight integration with Braiins Pool's fee rebate, and being the firmware that actually ships Stratum V2 today rather than at some future date. If your priority is decentralization rather than the last watt of efficiency, that last point is the differentiator.

Stratum V2: why it matters

Stratum is the protocol that connects miners to pools. The original Stratum V1 has a structural problem for Bitcoin's decentralization: the pool decides which transactions go into each block and hands miners a ready-made template to hash against. Miners contribute the electricity and hardware but have no say over block contents. Because a handful of pools command most of the network's hashrate, that means a very small number of operators effectively decide what goes into most Bitcoin blocks — a censorship and centralization risk.

Stratum V2, which Braiins co-created, redesigns this. Its key addition is the Job Declaration Protocol. A miner running their own Bitcoin full node can maintain their own mempool, select transactions according to their own policy, build a complete block template locally, and propose it to the pool. The pool validates that the template pays the correct reward to the right address but does not get to dictate the transaction list. Block construction moves from the pool back toward the individual miner. Stratum V2 also adds encryption and other efficiency and security improvements over V1, but the transaction-selection shift is the politically important one.

This is no longer a fringe idea. As of mid-2026 Braiins Pool runs Stratum V2 in production alongside newer V2-native pools such as DEMAND Pool (DMND, which opened to miners in early 2025 and mined the first live Job Declaration block in June 2025), and in May 2026 seven major pools representing roughly 75% of global hashrate — including Foundry USA, AntPool, F2Pool, and others — joined the Stratum V2 Working Group. Most are still in testing rather than full production, but the direction of travel is clear: the protocol Braiins helped design is becoming an industry standard. That is arguably Braiins' most lasting contribution — bigger than the pool itself.

The numbers and market position

Braiins Pool's claim to fame is longevity, not size. It has operated continuously since 2010 and reports having mined over 1.3 million BTC across its lifetime — a figure no younger pool can match. But in raw current hashrate it is far smaller than today's leaders. In mid-2026 the Bitcoin network runs at roughly 940 EH/s, and just two pools — Foundry USA and AntPool — command close to half of it; a handful of pools direct block construction for the large majority of blocks. Braiins Pool sits outside that oligopoly.

For a home or small commercial miner, being outside the giants is not necessarily a downside. Under FPPS your payout is smoothed regardless of pool size, so you are not gambling on your specific pool's block luck. What you get from Braiins instead is transparency, open tooling, no-minimum Lightning payouts, and — if you buy into the decentralization argument — a pool that actually runs Stratum V2 rather than merely promising to. The trade-off is that a smaller pool is a smaller business; you are weighing ideology and features against the scale of the majors.

How to actually use Braiins

The practical path depends on what you have:

1. Get an account and point your miners at the pool. Create a Braiins Pool account, set up worker credentials, and configure your ASIC's pool settings to the Braiins Pool stratum URL. Set a Bitcoin payout address — and if you want instant, fee-free, no-minimum payouts, connect a Lightning wallet.
2. Flash Braiins OS+ (optional but incentivized). If your hardware is supported, installing Braiins OS+ unlocks autotuning and rebates your pool fee to an effective 0%. Download only from braiins.com, and start with conservative power targets before pushing efficiency.
3. Tune for your electricity price. Autotuning matters most when power is your main cost. Target a power or efficiency setpoint that keeps the machine cool and stable rather than chasing maximum hashrate.
4. Consider Stratum V2 and your own node. To get the full decentralization benefit, run a Bitcoin full node and use the Job Declaration flow so you are constructing your own block templates — the ideological core of the whole exercise.

Risks and honest caveats

• Mining profitability is about power, not pools. No pool or firmware makes mining profitable if your electricity is expensive or your hardware is old. Braiins improves efficiency and fees at the margin; it does not change the underlying economics.
• Custom firmware has real downsides. Flashing Braiins OS+ voids manufacturer warranties, and aggressive autotuning raises temperatures and hardware stress. Overclocking trades lifespan for output. Download only from the official site.
• Smaller pool, bigger platform bet. Braiins Pool's hashrate is modest next to the majors. FPPS smooths your payouts, but you are still trusting a specific operator's solvency and uptime.
• Scam surface. Because Braiins has no token, any "Braiins coin," airdrop, or token presale is fraudulent. Fake firmware downloads and phishing sites are the real immediate danger — reach everything through your own bookmark to braiins.com.
• Stratum V2 is still rolling out. Broad industry commitment is not the same as broad production deployment. The decentralization payoff depends on adoption that is still in progress.

Bottom line

Braiins is two things that reinforce each other: the oldest continuously running Bitcoin mining pool, and the firmware-and-protocol work that tries to keep mining decentralized. Braiins Pool gives small miners a transparent FPPS pool with fee-free Lightning payouts and a 0% effective fee if they run Braiins OS+. Braiins OS+ gives them per-chip autotuning and native Stratum V2. And Stratum V2 — co-authored by Braiins and, in 2026, being adopted by pools controlling most of the network — is the part with implications far beyond one company. There is no token to speculate on here; the value is the infrastructure. For anyone who mines Bitcoin, or cares about who decides what goes into its blocks, Braiins is worth understanding.

Related guides

• Bitcoin Mining Methods in 2026
• What Is Antpool?
• What Is Bitmain?
• What Is ViaBTC?
• Trezor: The Complete Guide

Not financial advice. Mining profitability depends on electricity cost, hardware efficiency, and Bitcoin's price; custom firmware voids warranties. Always download firmware and verify pool details on official Braiins channels.