Sometimes, the real story isn’t about whether someone hit 51%. It’s about how close they got — and what happened along the way.
Qubic’s “Monero experiment” wasn’t just a test of computing power; it was a stress test for a network that prides itself on military-grade security. The headline number — somewhere between 28% and 35% of Monero’s hashrate — might not sound fatal. But the ripple effects? Those were loud enough for the whole chain to hear.
From mid-July, the data began whispering that something was off. Variance in the difficulty curve spiked. Orphan rates shifted. The chain’s rhythm — normally steady — started tripping over itself. By the time Qubic officially announced their “takeover” on August 2nd, the telltale signs had been dancing on the charts for weeks.
This wasn’t mining as usual. It was selfish mining — likely the Eyal-Sirer strategy — where blocks are withheld, timed, and deployed to sideline competitors. It’s the kind of move that lets a miner with just a third of the network power act like a far bigger player, without ever actually owning the majority.
Perhaps most intriguing: at least 5% of the hashrate Qubic used came from new sources, not from Monero miners simply switching pools. In other words, Qubic didn’t just shuffle the pieces — they brought extra ones onto the board.
And here’s the uncomfortable takeaway: this wasn’t about a double-spend, nor a permanent network chokehold. It was a proof of concept that Monero’s much-celebrated ASIC resistance — the very thing meant to protect it — can also be its soft spot. CPUs and GPUs may keep mining “open,” but they also make it easier for a coordinated, well-resourced actor to pull off an attack like this.
Qubic didn’t need 51% to make their point. They just needed to show that the point exists. And they did. Loudly.
