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Manufacturers Are Building ASICs That Look More Like Servers. Here’s Why: Blockspace

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In the beginning, there were only CPUs, then GPUs, for bitcoin mining. Then came the mighty ASIC in 2013, and with it, the “shoebox” form factor that has become emblematic of the bitcoin mining industry.

What comes next? Will the shoebox design persist as standard for bitcoin mining ASICs? Or will another form factor that more resembles traditional datacenter servers win out?

ASIC manufacturers are increasingly betting on the latter – or at least, that a hydro-cooled server rack design will become a substantial portion of bitcoin mining fleets. Moreover, they’re leaning into the “direct-to-chip” cooling for further efficiency gains.

Last September, Bitmain announced its model U3S21EXPH (a bit of a mouthful, eh?) developed in a partnership with Hut 8. Its U3 design means that one unit takes up three spaces in a traditional server rack. MicroBT soon followed with its M63 Hydro series, as did Bitdeer’s Sealminer A2 Hydro unit.

Following suit, Auradine released its server rack model, the AH3880, this March. Its U2 design, which occupies two server slots, is a bit smaller, but it packs more hashrate per unit of space at 600 TH/s (or 300 TH/s per slot) versus Bitmain’s 860 TH/s (286.66 TH/s per slot).

Shoebox out

So, what’s with the switch up from the traditional shoe box? For Auradine, it’s all about customer demand.

“[Our new model is] based upon a lot of feedback that we got from our miner customers … we’ve been working with the miners even throughout the design process,” Auradine CSO Sanjay Gupta said on the most recent Mining Pod. “They indicated to us that they were looking for a quality hydro based miner.”

In its partnership with Bitmain for the U3S21EXPH, “Hut 8 was instrumental in the custom design for the infrastructure, particularly the U form factor which is compatible with HPC style architecture,” Hut 8 Head of Investor Relations Sue Ennis told Blockspace last September. (More on the high performance computing angle later).

The benefit of a server rack ASIC lies in standardization. Bitcoin miners are increasingly marching in step with the traditional datacenter industry, and that industry could see 40% adoption of direct liquid-to-chip cooling by 2026, according to data center developer Cyrus One.

If miners adopt this design, then theoretically, they can optimize their supply chains by converging on server designs that are becoming best practice in the big-boy data center sector.

This could make building and repairing bitcoin mines easier. And it could also make mining companies more nimble if they want to flex out of bitcoin mining and into other forms of compute.

Enter AI and HPC

As with so much mining news today, of course the spectre of AI is looming in the background.

If miners construct their data centers with traditional server rack designs, there is one less pain point if they want to retrofit these sites for AI and HPC loads. Of course, they’d still need to augment the sinews, muscles and veins of their operations with more robust networking and electrical infrastructure, but server racks would provide a backbone for AI/HPC services that requires less restructuring than legacy bitcoin mines. As Ennis put it, “the U form factor … is compatible with HPC style architecture.”

Echoing this, Gupta said in our Mining Pod interview that “[The U form factor has] been used for the AI data center. It’s easy to adjust. It’s got a high [power] density to it … [it] is extremely relevant for AI data centers as well, and we are looking at a joint strategy between AI for HPC and Bitcoin mining. So the U form factor works well with that.”

Who’s buying it?

Perhaps needless to say, the server rack form factor for bitcoin mining is still in its infancy, and while there is promise that such a design could win out, there’s no guarantee.

To start, bitcoin miners will not only need to rework the innards of their mines but also completely rewire their electrical infrastructure (which is unlikely to happen at existing mines).

Cholla’s Brad Cuddy, which operates hydro-cooled ASIC miners, told Blockspace last September that “he’s excited to see the shift from the shoebox design to the [server rack] form factor.” But he said the U3S21EXPH’s voltage range is incompatible with certain electrical infrastructure that miners use with other Bitmain models.

“The restricted range of 380 to 415 volts reduces its compatibility for retrofitting. I would have liked to see the voltage range go all the way up to 480 volts to allow for more interoperability with current infrastructure deployments,” he said.

As such, it’s likely that we’ll see miners integrate these units at new sites. Hut 8 is taking this approach with plans to host 15 EH/s of U3S21EXPH units for Bitmain (with an option to purchase) at its Vega, Texas site, which is due to start operating in Q2.

So far, Hut 8 is the only public buyer of Bitmain’s U3S21EXPH. Gupta did not reveal which miners are under contract for its AH3880, but he did say they include several industrial scale private and public miners. It wouldn’t be surprising to see MARA, one of Auradine’s key partners which has also invested upwards of $50 million in the company, adopt the model.

Should Hut 8’s Vega site run smoothly on Bitmain’s model, and if we assume that MARA will deploy Auradine’s, public miners may lead where others will follow, and we could see a new form factor slowly seep into modern mine design.

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Is Hope a Strategy? Bitcoin Reclaims $85K Ahead of Trump ‘Liberation Day’ Tariff Announcement

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Recently very shaky risk assets — crypto among them — are attempting a rally on Tuesday, perhaps. buoyed by chatter that Donald Trump’s tariffs won’t be as stringent as feared.

In early afternoon U.S. action, bitcoin (BTC) had climbed to just above $85,000, ahead 2.1% over the past 24 hours. Previously really roughed up crypto majors like ether (ETH), dogecoin (DOGE) and cardano (ADA) had put in gains of roughly twice that amount.

Crypto stocks are also performing well, with bitcoin miners Core Scientific (CORZ) and CleanSpark (CLSK) jumping almost 10% on the day. Strategy (MSTR) is up 5.4% and Coinbase (COIN) 2.1%.

U.S. stocks reversed early session losses to turn higher as well, with the Nasdaq now ahead just shy of 1% for the day.

The action comes ahead of the Trump administration’s so-called «Liberation Day» tariff rollout set for tomorrow after the close of U.S. trading.

Hope?

A report from NBC News suggested the market’s most feared option — blanket 20% tariffs across the board — is «less likely» to be the direction taken by the White House. Instead, according to the report, a «tiered system» of different rates or country-by-country rates could be announced.

Also maybe helping is what appears to be the first acknowledgement that the administration is aware of the market tumult resulting from all the tariff chatter. Speaking today at her daily briefing, White House Press Secretary Karoline Leavitt said that there were legitimate concerns about market swings.

Meanwhile, Israel’s Minister of Finance Bezalel Smotrich announced on Tuesday that a process had been launched to get rid of tariffs on U.S. imports in that country.

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Web3 Has a Memory Problem — And We Finally Have a Fix

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Web3 has a memory problem. Not in the “we forgot something” sense, but in the core architectural sense. It doesn’t have a real memory layer.

Blockchains today don’t look completely alien compared to traditional computers, but a core foundational aspect of legacy computing is still missing: A memory layer built for decentralization that will support the next iteration of the internet.

Muriel Médard is a speaker at Consensus 2025 May 14-16. Register to get your ticket here.

After World War II, John von Neumann laid out the architecture for modern computers. Every computer needs input and output, a CPU for control and arithmetic, and memory to store the latest version data, along with a “bus” to retrieve and update that data in the memory. Commonly known as RAM, this architecture has been the foundation of computing for decades.

At its core, Web3 is a decentralized computer — a “world computer.” At the higher layers, it’s fairly recognizable: operating systems (EVM, SVM) running on thousands of decentralized nodes, powering decentralized applications and protocols.

But, when you dig deeper, something’s missing. The memory layer essential for storing, accessing and updating short-term and long term data, doesn’t look like the memory bus or memory unit von Neumann envisioned.

Instead, it’s a mashup of different best-effort approaches to achieve this purpose, and the results are overall messy, inefficient and hard to navigate.

Here’s the problem: if we’re going to build a world computer that’s fundamentally different from the von Neumann model, there better be a really good reason to do so. As of right now, Web3’s memory layer isn’t just different, it’s convoluted and inefficient. Transactions are slow. Storage is sluggish and costly. Scaling for mass adoption with this current approach is nigh impossible. And, that’s not what decentralization was supposed to be about.

But there is another way.

A lot of people in this space are trying their best to work around this limitation and we’re at a point now where the current workaround solutions just cannot keep up. This is where using algebraic coding, which makes use of equations to represent data for efficiency, resilience and flexibility, comes in.

The core problem is this: how do we implement decentralized code for Web3?

A new memory infrastructure

This is why I took the leap from academia where I held the role of MIT NEC Chair and Professor of Software Science and Engineering to dedicate myself and a team of experts in advancing high-performance memory for Web3.

I saw something bigger: the potential to redefine how we think about computing in a decentralized world.

My team at Optimum is creating decentralized memory that works like a dedicated computer. Our approach is powered by Random Linear Network Coding (RLNC), a technology developed in my MIT lab over nearly two decades. It’s a proven data coding method that maximizes throughput and resilience in high-reliability networks from industrial systems to the internet. 

Data coding is the process of converting information from one format to another for efficient storage, transmission or processing. Data coding has been around for decades and there are many iterations of it in use in networks today. RLNC is the modern approach to data coding built specifically for decentralized computing. This scheme transforms data into packets for transmission across a network of nodes, ensuring high speed and efficiency.

With multiple engineering awards from top global institutions, more than 80 patents, and numerous real-world deployments, RLNC is no longer just a theory. RLNC has garnered significant recognition, including the 2009 IEEE Communications Society and Information Theory Society Joint Paper Award for the work «A Random Linear Network Coding Approach to Multicast.» RLNC’s impact was acknowledged with the IEEE Koji Kobayashi Computers and Communications Award in 2022.

RLNC is now ready for decentralized systems, enabling faster data propagation, efficient storage, and real-time access, making it a key solution for Web3’s scalability and efficiency challenges.

Why this matters

Let’s take a step back. Why does all of this matter? Because we need memory for the world computer that’s not just decentralized but also efficient, scalable and reliable.

Currently, blockchains rely on best-effort, ad hoc solutions that achieve partially what memory in high-performance computing does. What they lack is a unified memory layer that encompasses both the memory bus for data propagation and the RAM for data storage and access.

The bus part of the computer should not become the bottleneck, as it does now. Let me explain.

“Gossip” is the common method for data propagation in blockchain networks. It is a peer-to-peer communication protocol in which nodes exchange information with random peers to spread data across the network. In its current implementation, it struggles at scale.

Imagine you need 10 pieces of information from neighbors who repeat what they’ve heard. As you speak to them, at first you get new information. But as you approach nine out of 10, the chance of hearing something new from a neighbor drops, making the final piece of information the hardest to get. Chances are 90% that the next thing you hear is something you already know.

This is how blockchain gossip works today — efficient early on, but redundant and slow when trying to complete the information sharing. You would have to be extremely lucky to get something new every time.

With RLNC, we get around the core scalability issue in current gossip. RLNC works as though you managed to get extremely lucky, so every time you hear info, it just happens to be info that is new to you. That means much greater throughput and much lower latency. This RLNC-powered gossip is our first product, which validators can implement through a simple API call to optimize data propagation for their nodes.

Let us now examine the memory part. It helps to think of memory as dynamic storage, like RAM in a computer or, for that matter, our closet. Decentralized RAM should mimic a closet; it should be structured, reliable, and consistent. A piece of data is either there or not, no half-bits, no missing sleeves. That’s atomicity. Items stay in the order they were placed — you might see an older version, but never a wrong one. That’s consistency. And, unless moved, everything stays put; data doesn’t disappear. That’s durability.

Instead of the closet, what do we have? Mempools are not something we keep around in computers, so why do we do that in Web3? The main reason is that there is not a proper memory layer. If we think of data management in blockchains as managing clothes in our closet, a mempool is like having a pile of laundry on the floor, where you are not sure what is in there and you need to rummage.

Current delays in transaction processing can be extremely high for any single chain. Citing Ethereum as an example, it takes two epochs or 12.8 minutes to finalize any single transaction. Without decentralized RAM, Web3 relies on mempools, where transactions sit until they’re processed, resulting in delays, congestion and unpredictability.

Full nodes store everything, bloating the system and making retrieval complex and costly. In computers, the RAM keeps what is currently needed, while less-used data moves to cold storage, maybe in the cloud or on disk. Full nodes are like a closet with all the clothes you ever wore (from everything you’ve ever worn as a baby until now).

This is not something we do on our computers, but they exist in Web3 because storage and read/write access aren’t optimized. With RLNC, we create decentralized RAM (deRAM) for timely, updateable state in a way that is economical, resilient and scalable.

DeRAM and data propagation powered by RLNC can solve Web3’s biggest bottlenecks by making memory faster, more efficient, and more scalable. It optimizes data propagation, reduces storage bloat, and enables real-time access without compromising decentralization. It’s long been a key missing piece in the world computer, but not for long.

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Risk to Bitcoin Buying Plans Makes Strategy a Sell, Says Wall Street Analyst

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Although Strategy’s (MSTR) aggressive buying of bitcoin (BTC) has sent its shares soaring over 2,500% over the past five years, one analyst argues that the reverse could soon be the case.

“While we were negative on several respects upon initiation, we have gained incremental confidence that the convertible issuance strategy is likely tapped,” wrote Monness Crespi analyst Gus Gala, downgrading MSTR to sell just two weeks after initiating coverage at neutral.

Strategy currently holds 528,185 BTC on its balance sheet and has been buying sizable quantities nearly every week for the past few months, mostly funded by common share issuance and also sales of its initial preferred series STRK.

Gala’s price target of $220 suggests just shy of 30% downside from the current price in the $300 area.

Gala argued that it will become increasingly more difficult for MSTR to raise money to buy bitcoin via share issuance, forcing the company to shift towards fixed income vehicles.

“If fixed income securities do not become a greater portion of issuance, the BTC treasury strategy will look increasingly challenged.”

Gala noted that MSTR has already used $18.6 billion of its $21 billion common share at-the-market offering. The company also raised another $711 million last week via STRF, its second series of preferred stock.

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