The Transaction That Changed Everything, And Nothing

On August 26, 2026, at block 964,199, something unprecedented happened. StarkWare researcher Avihu Levy, the company’s first employee and general manager of applications, executed the first quantum-resistant transaction on the Bitcoin mainnet. No soft fork. No hard fork. No core protocol upgrade.

The method, called Quantum Safe Bitcoin (QSB), uses a technique called “signature grinding”, generating millions of signature candidates until finding one with specific structural properties that don’t expose vulnerable cryptographic material while the transaction sits in Bitcoin’s public mempool. It’s a workaround that stays entirely within Bitcoin’s existing script limits.

StarkWare CEO Eli Ben-Sasson called it “huge” and declared that Bitcoin is “quantum-safe TODAY”. Speaking at Bitcoin Asia in Hong Kong, Starknet Foundation’s Damian Chen called it a “monumental moment”.

But here’s the catch that everyone’s fighting about: the transaction wasn’t relayed through the public mempool. Ordinary Bitcoin nodes don’t recognize this non-standard format. It had to be handed directly to a miner, MARA’s Slipstream service, willing to accept it. In other words, Bitcoin’s “quantum-safe” transaction couldn’t actually use Bitcoin’s normal network.

The $150 Problem Nobody’s Talking About

Let’s talk about what this “solution” actually costs. Levy’s own estimates put the off-chain compute at $75 to $150 per transaction. StarkWare later described it as costing “several hundred dollars”. A single transaction takes hours to produce.

That’s not a solution. That’s a luxury item for whales.

“The scheme is also computationally expensive, costing $75-$150 per transaction, making it suitable only for large transfers and not for daily use or scaling solutions like the Lightning Network,” one analysis noted.

Levy himself calls QSB a “last-resort measure,” not a scalable permanent solution. He explicitly advocates for parallel protocol upgrades. Ben-Sasson himself said he still wants Bitcoin to choose a soft fork.

So why all the hype? Because this isn’t really about quantum safety. It’s about power.

The Developer Civil War

The quantum debate has already split the Bitcoin community into warring factions. On one side, you have Blockstream CEO Adam Back pushing for optional quantum-resistant upgrades now, arguing that “preparation is key” and that “making changes in a controlled way is far safer than reacting in a crisis”.

On the other side, you have BIP-361, a proposal from Jameson Lopp and five other developers that would phase out quantum-vulnerable addresses over five years and freeze any coins that fail to migrate. That includes roughly 1 million Bitcoin attributed to Satoshi Nakamoto and an estimated 5.6 million coins that haven’t moved in over a decade.

Cardano founder Charles Hoskinson weighed in, calling BIP-361 a “hard fork in disguise” that would “effectively confiscate 1.7 million BTC”.

And then there’s the drama that erupted just two weeks before Levy’s transaction. Luke Dashjr, one of Bitcoin’s most contested figures, lead maintainer of Bitcoin Knots and former chairman of mining pool Ocean, was stripped of his BIP editor role. The trigger? A conflict of interest around the failed BIP-110 soft fork proposal. Dashjr was accused of abusing his editorial authority, trying to assign a BIP number before it had been discussed, then quickly merging an update without due process.

The removal happened just 26 hours after fellow editor Mark Erhardt filed a motion. Erhardt’s motion cited four grounds: conflict of interest, thin contributions to editor work, leadership of a contested fork initiative, and broken coordination with other editors.

The timing matters. Dashjr’s removal on August 10, followed by Levy’s QSB transaction on August 26, and the SHRINCS BIP publication on August 26-27, all within weeks. The quantum debate isn’t just heating up. It’s exploding.

The 1.7 Million Bitcoin Elephant in the Room

Here’s the inconvenient truth that nobody wants to address: QSB doesn’t protect coins whose public keys have already been exposed. Researchers at Project Eleven flagged the same mempool-stage vulnerability QSB targets, warning that funds could be intercepted from a transaction before it even clears.

Critics note that QSB doesn’t address vulnerabilities in existing exposed public keys or dormant wallets, which hold an estimated 1.7 million BTC. As of March 1, 2026, over 34% of all Bitcoin supply holds exposed public keys vulnerable to quantum attacks.

Bitcoin ESG specialist Daniel Batten said Ben-Sasson’s claim that Bitcoin is “quantum-safe today” goes too far. He pointed to an estimated 1.7 million BTC sitting in early P2PK addresses that could be vulnerable if a quantum computer becomes powerful enough to crack them.

Levy and Ben-Sasson acknowledge this. The method doesn’t help coins with previously exposed public keys, a potential attacker would have had enough time to analyze them before a protected transaction is sent.

So we have a “solution” that:

• Costs up to $150 per transaction
• Takes hours to execute
• Can’t be relayed through the normal network
• Doesn’t protect 1.7 million already-vulnerable Bitcoin
• Doesn’t work for Lightning Network or daily use
• Is described by its own creator as a “last-resort measure”

And yet, it’s being sold as “Bitcoin is quantum-safe TODAY.”

The Real Question Nobody’s Asking

The quantum threat is real. Google and Cloudflare have set a transition horizon to 2029. Google published research in March that added fresh pressure to the debate. Quantum researchers have warned that Bitcoin’s software will eventually need to be upgraded.

But the question isn’t whether quantum computers will arrive. It’s whether Bitcoin’s famously conservative governance can coordinate a response before the crisis hits.

Ben-Sasson put it best: “The question to me has never been when will quantum arrive. We all know quantum will arrive at one stage, but the question to me has always been, how long will it take for you to be ready when quantum does arrive?”

Right now, the answer doesn’t look good. Developers are fighting. Editors are getting fired. Proposals are getting rushed. And a $150-per-transaction “workaround” is being celebrated as a breakthrough while 1.7 million Bitcoin sit exposed.

Summary

The first quantum-safe Bitcoin transaction happened on August 26, 2026. Avihu Levy and StarkWare proved it can be done without changing the protocol. But the celebration masks a deeper crisis: QSB is expensive, slow, non-standard, and doesn’t protect already-vulnerable coins. Meanwhile, the developer community is tearing itself apart over how to handle the quantum threat, with BIP-361 proposing to freeze millions of Bitcoin, Adam Back pushing optional upgrades, and Luke Dashjr getting removed from his editorial role in a conflict-of-interest scandal. The quantum debate isn’t a technical problem. It’s a governance problem. And Bitcoin isn’t ready.