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Buterin Says Ethereum’s Biggest Bottlenecks Are State Tree and VM, Proposes Deep Fix

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Buterin Says Ethereum's Biggest Bottlenecks Are State Tree and VM, Proposes Deep Fix


Buterin proposes binary state trees and eventual RISC-V VM shift to improve Ethereum’s proving efficiency and execution simplicity.

Vitalik Buterin has proposed execution-layer changes that could fundamentally reshape Ethereum’s core architecture. The project’s co-founder argued that deep modifications to the network’s state tree and virtual machine are necessary to remove what he described as the chain’s biggest proving bottlenecks.

In a detailed post on X, Buterin said that the state tree and VM together account for more than 80% of the constraints that affect proof efficiency and called them “basically mandatory” targets if Ethereum wants to enable scalable client-side and zero-knowledge proving use cases.

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Ethereum Overhaul

He pointed to EIP-7864, a proposal developed by Guillaume Ballet and others, which would replace Ethereum’s current hexary Keccak-based Merkle Patricia Tree with a binary tree built on a more efficient hash function. According to Buterin, the change would shorten Merkle branches by roughly four times, by cutting bandwidth requirements and making client-side branch verification significantly cheaper.

This could reduce data costs for tools such as Helios and private information retrieval systems by 4x, Buterin added. Proving efficiency could also be improved by 3-4 times from shorter branches alone. He expects additional gains if Ethereum shifts to hash functions such as BLAKE3, which is estimated to be three times more efficient than Keccak. Meanwhile, a Poseidon variant could offer up to 100 times improvement, though he noted further security work would be required.

The proposed binary design would also group storage slots into 64-256-slot “pages” and allow more efficient loading and editing of adjacent storage, potentially saving more than 10,000 gas per transaction for applications that access early storage slots. Buterin explained that a prover-friendly state tree would also allow zero-knowledge applications to compose directly with Ethereum’s state instead of building independent trees, while at the same time simplifying the structure and enabling metadata additions for future state expiry mechanisms.

Beyond the state tree overhaul, Buterin made the case for eventually replacing the Ethereum Virtual Machine with a RISC-V-based VM, as he described the idea as longer-term and non-consensus. But he expressed high conviction that it would become “the obvious thing to do” after state roadmap upgrades are complete.

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Possible Deployment Roadmap

The Ethereum co-founder said that a RISC-V VM would be more execution-efficient, more prover-friendly, and simpler, while noting that many existing provers are already written in RISC-V and that an interpreter could be implemented in only a few hundred lines of code. He detailed a phased transition plan beginning with using the new VM for precompiles, then allowing developers to deploy contracts directly in the new VM, and ultimately retiring the EVM into a compatibility layer written as a smart contract in the new system.

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Under that roadmap, users would retain full backward compatibility apart from gas cost changes, which Buterin said would likely be overshadowed by scaling improvements in the coming years.

Buterin’s latest push comes just days after he introduced a quantum-resistance roadmap, which included proposals to replace consensus-layer BLS signatures with hash-based schemes such as Winternitz variants.

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Crypto World

Iran’s $7.8B Crypto Shadow Economy Just Got a Lot More Interesting

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Crypto Breaking News

While the world watches missiles fly over Iran, there’s a parallel war happening on-chain.

And it’s been running quietly for years.

Iran legalized Bitcoin mining back in 2019. The deal? Licensed operators get subsidized electricity, and mined BTC goes straight to the central bank. The government then uses it to pay for imports, machinery, fuel, consumer goods, without touching a single U.S.-controlled bank.

Clean. Borderless. Almost invisible.

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The numbers are staggering. Chainalysis clocked Iran’s crypto ecosystem at $7.78 billion in 2025, bigger than the GDP of the Maldives, and growing faster than the year before.

This isn’t a fringe workaround. It’s infrastructure.

The IRGC doesn’t just participate, It dominates

IRGC-linked addresses accounted for more than 50% of total Iranian crypto inflows in Q4 2025, with over $3 billion received last year. And those are only the wallets we know about — the ones already flagged on sanctions lists. The real number is almost certainly bigger.

The U.S. Treasury has since sanctioned two UK-registered crypto exchanges — Zedcex and Zedxion — for facilitating IRGC transactions. One of them processed over $94 billion in transactions since 2022. Let that sink in.

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Stablecoins are the other half of the equation

Iran’s central bank accumulated at least $507M in USDT, purchased systematically through a network of around 50 crypto wallets — while the rial hit a historic low of 1.47 million per dollar and inflation hit 42.5%. The stablecoin play wasn’t saving the rial. It was replacing it.

Meanwhile, Iran’s defense export center Mindex now openly accepts crypto for weapons exports. Missiles. Aircraft. Tanks. Ships. The website lists “the cryptocurrency agreed upon in the contract” as an accepted payment method.

This is no longer just sanctions evasion. It’s a parallel economy with its own rails.

Then things got messy

In June 2025, Nobitex — Iran’s largest crypto exchange with over 11 million users — was hit by a $90M cyberattack attributed to Israel-linked group Predatory Sparrow. The attackers didn’t cash out. They moved the funds to vanity wallet addresses referencing the IRGC, ensuring the money stayed permanently frozen. This was financial warfare, not theft.

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The fallout was immediate. Inbound transactions to Nobitex dropped 70% year-on-year. June saw a 50% contraction in crypto flows compared to the previous year. July slumped 76%.

Then Tether piled on. In July 2025, Tether executed its largest-ever freeze of Iranian-linked funds, blocking 42 crypto addresses, over half of which were heavily tied to Nobitex.

Iran’s response? The central bank imposed overnight trading restrictions, limiting exchange operating hours to between 10AM and 8PM. When the financial system cracks, the first instinct is control.

But here’s what makes this story bigger than sanctions

Iran’s IRGC-linked mining operations have been drawing colossal amounts of power at heavily subsidized rates — effectively stealing electricity from the national grid. The cost of power outages to Iran’s economy is estimated at over $25 billion annually. Ordinary Iranians sit in the dark while the regime mines Bitcoin.

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And yet — those same Iranians also use crypto to survive. For most people in Iran, crypto is primarily about access. Hedging against 40%+ inflation. Moving savings before the rial loses another 20%. Getting money out during internet blackouts.

Around 22% of the Iranian population now uses cryptocurrencies. Not for speculation. For survival.

So what happens now?

Fresh U.S. and Israeli strikes are targeting the infrastructure that keeps all of this running. Power grids. Mining operations. Financial nodes. The same system the regime uses to fund weapons exports is the same system ordinary Iranians use to protect their savings.

That dual reality, state weapon AND civilian lifeline, is what makes this situation unlike anywhere else in the world.

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The conflict isn’t just military. It’s financial. And it’s playing out on a public blockchain, for anyone paying attention.

Risk & affiliate notice: Crypto assets are volatile and capital is at risk. This article may contain affiliate links. Read full disclosure

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Crypto World

US Authorities Seek to Recover $327K USDt from Romance Fraud Scheme

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US Authorities Seek to Recover $327K USDt from Romance Fraud Scheme

A February report claimed that Tether had frozen about $4.2 billion worth of its USDt stablecoin allegedly connected to illicit activities since 2023.

The US Justice Department is seeking to recover about $327,829 worth of stablecoins allegedly connected to a money laundering scheme part of an online romance scam.

In a Monday notice, the US Attorney’s Office for Massachusetts said it had filed a civil forfeiture action to recover more than 327,829 of Tether’s USDt (USDT). According to authorities, the funds were tied to an alleged online romance fraud scheme perpetrated by an individual named “Linda Brown” which targeted a Massachusetts resident starting in 2024. 

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“Some of the victim’s funds were traced to multiple unhosted cryptocurrency wallets, which were seized in August 2025,” said the Justice Department. “The complaint alleges that all cryptocurrency associated with those wallets was property involved in money laundering.”

The notice of the romance scam came about three weeks after people in many countries celebrated Valentine’s Day. The US Attorney’s Office for the Northern District of Ohio issued a warning before the holiday about romance scams, informing people not to “send money, gift cards, or cryptocurrency to someone you have not met in person.”

Related: February crypto losses hit lowest level since March 2025, says PeckShield

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Cointelegraph reached out to Tether for comment, but had not received a response at the time of publication.

Tether froze $4.2 billion tied to illicit activity in previous three years

On Friday, a spokesperson for the stablecoin issuer reportedly told Reuters that Tether had frozen about $4.2 billion worth of USDt connected to suspected criminal activity since 2023.

The company has the ability to freeze its stablecoin by blacklisting certain wallet addresses. For example, Tether reported in February that it had frozen about $544 million allegedly tied to unlawful betting platforms and money laundering at the request of Turkish authorities.