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Vitalik Buterin unveils plan to curb block builder centralization

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Vitalik Buterin to spend $43 million on Ethereum development

Vitalik Buterin is turning his attention to a part of Ethereum most users never think about but that has quietly become one of its biggest pressure points: who gets to decide what transactions goes into a block.

In a new blog post on Monday, the Ethereum co-founder lays out a series of ideas aimed at preventing block building, the process of assembling transactions before they’re finalized onchain, from becoming too centralized.

While Ethereum’s upcoming “Glamsterdam” upgrade will formalize proposer-builder separation, which will allow validators to outsource block construction to a competitive market, Buterin argues that simply creating a marketplace of builders doesn’t solve everything. If a small number of builders dominate, they could still censor transactions or extract outsized profits from users.

One proposal, known as FOCIL, would act as a kind of anti-censorship backstop. Under the design, a small group of randomly selected participants would each choose transactions that must be included in the next block. If those transactions are missing, the block would be rejected. The idea is that even if a single hostile builder controlled the entire market, they couldn’t permanently exclude specific users.

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Another focus of his post is so-called “toxic MEV,” where traders exploit visibility into pending transactions to front-run or “sandwich” users’ trades. One potential fix is encrypting transactions until they are finalized, preventing opportunistic actors from seeing them in advance.

Buterin also points to risks at the networking layer, where transactions can be observed by intermediaries before they even reach a block, suggesting that anonymized routing systems could become an important line of defense.

Longer term, he sketches out a vision of more distributed block building, where not every transaction requires full global coordination. Much of Ethereum’s activity, he argues, may not need to be processed in a single, tightly ordered bundle, opening the door to designs that reduce central chokepoints.

Overall Buterin seems to focus on as Ethereum scales, decentralization challenges are shifting from validators to the infrastructure that decides what users’ transactions actually make it onchain.

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Read more: Vitalik Buterin reveals his bold new plan to fix Ethereum’s scaling problem

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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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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.