Block Proto Rig

The Block Proto Rig is a SHA-256 Bitcoin miner from Block, Inc. — the company behind Cash App and Square — built around an unusually open, modular, self-hosted philosophy. In the cataloged configuration it is rated at roughly 819 TH/s for about 12,000 W, an efficiency near 14.65 J/TH that places it squarely in the current flagship tier.

What makes the Proto worth a page of its own is not a record-breaking efficiency number — it is the posture. Block is one of the only large companies to enter ASIC mining while publishing its firmware API, its fleet-management software, and a standardized, repair-friendly hardware concept. For a shop like D-Central, which has hand-repaired ASICs since 2016 and believes every layer of Bitcoin mining should be decentralized, that openness is the headline feature.

Spec snapshot

Chip and hashboard architecture

We will be straight about the limits of what is publicly known. Unlike Antminer or WhatsMiner platforms, where D-Central has years of hands-on reverse engineering, the Proto rig’s silicon has not yet passed across our bench. We treat its internal numbers as unconfirmed rather than guessing at them.

What can be stated with confidence comes from Block’s own published interfaces. The Proto platform exposes a modular, miner-hosted API decomposed into discrete subsystems — hashboard, PSU, fan, system, and miner-data services — which strongly implies a standardized, serviceable design: independent hashboards carrying the hashing ASICs, a dedicated power supply module, a fan/cooling module, and a system (control) board orchestrating them. That decomposition is exactly what an operator wants when a single board fails: isolate the module, swap it, keep mining.

On the silicon itself, Block has publicly described designing its own mining ASIC in-house on a leading-edge process node (widely reported as a 3-nanometer-class design) rather than buying merchant chips. D-Central has not independently verified the die, its core count, or its voltage topology, so we will not publish numbers we have not measured. What we can say generically applies to every modern SHA-256 ASIC of this class: hashing chips are wired in series strings across each hashboard, and supply voltage is regulated per voltage domain — per board or per string — never truly per individual chip. The Proto’s exact domain map remains an open question until one reaches our lab.

How that compares to what we do know

For context, the architectures we have fully mapped are precise: an Antminer S19 carries 76 hashing chips per board, an S19 Pro carries 114, and the latest S21-class boards run “no-PIC” silicon on a Zynq-class control SoC. We document those because we have driven them at the register level. The Proto deserves the same rigor — and will get it the moment one is available to study — rather than borrowed assumptions.

Real-world power and efficiency

The ~12,000 W figure is a nameplate rating. As with any ASIC, actual draw at the wall depends on ambient temperature, PSU conversion losses, and the firmware’s operating point, and typically runs a few percent above or below nameplate. At ~819 TH/s the cataloged ~14.65 J/TH is genuinely competitive with current-generation hardware — modern flagships cluster in roughly the 13–19 J/TH band — without being the absolute efficiency leader.

The interesting part is that Block’s open stack treats power as a first-class control. The fleet software ships explicit power-target and demand-response curtailment features (preview, staggered restore, max-duration caps), which means eco-modes, undervolting, and load-shedding are built into the platform rather than bolted on. Operators who want to understand the underlying levers — clock, voltage domain, and the efficiency-versus-output trade — can read our ASIC power profiles database, which explains how tuning headroom works across the model field. Note that autotuning on any modern miner is calculated at runtime against live board telemetry; it is not a fixed table of presets.

That ~40,944 BTU/h of waste heat is not a side effect to apologize for — it is roughly the output of a large residential space heater. Ducted into a workshop, garage, or hashcenter loop, it converts dollars you would have spent on heating into Bitcoin and warmth simultaneously.

Firmware and software: an open stack

This is where the Proto separates itself. On the device, Block runs ProtoOS with a documented OpenAPI / gRPC control surface. Above the fleet, Block publishes Proto Fleet, a genuinely open-source (Apache-2.0) control plane for pairing, monitoring, bulk-commanding, and curtailing a heterogeneous farm — the same product category as Foreman or Braiins Farm, but with the source in the open. Its miner-comms layer leans on asic-rs, the 256 Foundation’s multi-vendor Rust ASIC library, which is why the same tooling can speak to Antminer, WhatsMiner, Avalon, BitAxe, and the Proto alike.

Now the honest part about third-party firmware, because miners ask. The familiar aftermarket firmwares — Braiins OS+, VNish, LuxOS — are written for Bitmain and MicroBT control boards. They do not target the Proto platform, and there is no reason to expect them to; the Proto answers the “I want an open firmware” demand from the factory instead of from the aftermarket. On pool protocols, we have not verified native Stratum V2 mining on a Proto unit; among aftermarket firmwares, Braiins OS+ is the one that natively mines Stratum V2 today, and it runs on Bitmain hardware, not this one. We would rather say “unverified” than overstate it.

Where does DCENT_OS fit? D-Central’s open firmware effort targets Antminer- and WhatsMiner-class hardware that we have reverse-engineered; it does not currently flash the Proto. The alignment here is philosophical, not a flashable target — the Proto, asic-rs, the 256 Foundation, and DCENT_OS are all pulling the same rope: a Bitcoin mining stack that no single vendor can lock down. We will happily catalog that shared mission without pretending we ship something we do not.

Common faults and troubleshooting

Because the Proto is an emerging platform, there is no model-specific error-code corpus to point you at yet — and we will not invent one. What does transfer is the physics of SHA-256 hardware, which is the same regardless of badge:

• A dead or underperforming hashboard — the most common ASIC fault. The Proto’s modular, per-board API actually helps here: the system can report which board dropped, narrowing diagnosis quickly.
• PSU faults — with the power supply broken out as its own module, a failing PSU is a swap rather than a teardown.
• Thermal and fan faults — high power density means cooling is non-negotiable; airflow restriction or a failed fan will throttle or halt hashing.
• Voltage-domain or chip-string failures — when one string in a domain drops, the whole domain’s output suffers; this is a board-level repair, not a “replace one chip” job.

If you are chasing a fault on any ASIC, our ASIC fault finder walks symptoms back to likely root causes. As we accumulate bench data on Proto units, model-specific diagnostics will land here too.

Repair and longevity

D-Central has repaired ASICs in-house in Laval, Quebec since 2016, and the Proto’s design philosophy is, on paper, friendly to that work. Open APIs make telemetry legible instead of hidden, and a modular hashboard/PSU/fan/system layout is exactly the kind of architecture that rewards component-level repair rather than forcing whole-unit replacement. A machine you can diagnose and fix is a machine that stays out of the e-waste stream — the longevity argument and the decentralization argument are the same argument.

The realistic caveat for an emerging platform is parts availability: a secondary market for Proto hashboards and modules is still thin, which is the main constraint on third-party repair today rather than any difficulty in the hardware itself. If you run one and hit trouble, our ASIC repair service is the place to start a conversation; we would rather assess a real unit than speculate.

Who it is for and buying notes

The Proto Rig is aimed at miners who weight openness, modularity, and self-hosted control as heavily as raw J/TH — sovereignty-minded operators and farms that want to own their tooling end to end rather than depend on a single vendor’s closed dashboard. It is not, at the time of writing, a mainstream retail purchase, and D-Central does not stock it (hence no listed price). If your priority is pure efficiency-per-dollar from proven, widely-serviceable hardware, a current Antminer or WhatsMiner class machine from our ASIC miner database may suit you better.

If, on the other hand, the open-source ethos is what draws you, you are in good company. See our open-source miners comparison for how the Proto sits alongside other open projects, and the DCENT_axe if you want an affordable, fully open entry point into running — and tinkering with — your own hardware.

Generational context

The Proto belongs to a meaningful shift in the 2024–2025 hardware wave: for the first time, the open-hardware movement is producing machines, not just firmware. Bitmain and MicroBT earned their position by driving the efficiency curve relentlessly, and they deserve that credit — today’s sub-15 J/TH baseline exists because of their engineering. What is new is that the supply chain itself is starting to decentralize: Block fabricating its own silicon and open-sourcing the software around it; the 256 Foundation shipping open control boards and the asic-rs library; Intel’s BZM2 dies donated into open hands; the BitAxe community proving a single-ASIC miner can be fully open.

D-Central does not frame the Proto as “better than” the incumbents — it stands on their shoulders like everything else in this industry. We frame it as one more layer of Bitcoin mining moving from closed to open. That is a direction we have backed since 2016, and a machine like the Proto Rig is exactly the kind of hardware that makes the case in metal.