As a researcher with a background in blockchain technology and network security, I find Jameson Lopp’s actions intriguing yet controversial. The Bitcoin testnet attack he orchestrated resulted in an unprecedented surge in network activity and highlighted an underlying vulnerability that needed attention.


A malicious act on the Bitcoin testnet led to an unexpected spike in network action, resulting in the creation of approximately 165,000 new blocks – equal to the number generated over a three-year period – within a single week.

As a crypto investor, I’d put it this way: Jameson Lopp, my fellow Bitcoin enthusiast and co-founder of Casa, openly claimed responsibility for the recent incident in the Bitcoin community. However, his announcement sparked controversy among other developers in the field.

Lopp Defends Attack as ‘Trivial Exploit’

On the decentralized social media network Nostr, Lopp characterized the incident as a “simple vulnerability” that could be addressed with just 20 lines of code. When asked if the disruptive attack was worth its costs, Lopp stated that it resulted in expenses equivalent to one dollar in electricity fees.

Lopp justified his actions by explaining that his intentions were not harmful but instead meant to bring light to a concern he had previously brought up. He stressed that traditional approaches, like engaging in discussions via development email forums, hadn’t effectively resolved the issue at hand.

As a researcher, I understand that some may perceive me as taking an unfavorable role, but I’m merely the one bringing attention to a significant issue. It’s not always enough to just send an email; sometimes, more drastic measures are required to capture people’s focus.

As a researcher studying this incident, I can describe it as follows: The attackers initiated an assault on the testnet by overwhelming it with an excessive number of transactions and network spam. This led to a significant surge in workload for the network. Consequently, the network’s difficulty level rose sharply, resulting in the generation of approximately 165,000 blocks.

Based on mempool.space’s findings, there was a noticeable surge in hash rate and mining difficulty. The peak occurred on April 19 at approximately 2,315 terahashes per second (TH/s). However, following this attack, the levels dropped back down to around 86 TH/s by the end of April.

Backlash and Opinions

Lopp referred to the online griefing incident as a “natural stress test,” leading to even more criticism within the cryptocurrency community. He proposed restarting Bitcoin’s test network to deal with the “timewarp” issue and reinstate insignificant mining rewards.

Next weekend, I’ll release a comprehensive essay outlining my latest investment strategy in the crypto space. Those who have been following my emails to the development list may have already caught a sneak peek of it a few weeks back.

I suggest you view recent events as a free stress test. Sounds like you have room for improvement.

— Jameson Lopp (@lopp) April 29, 2024

Some, such as Pouliot, compared Lopp’s behavior to vandalism and went so far as to describe it as defiling a shared hot tub to induce a move.

At the spa, we’re enjoying a soak in the Jacuzzi together. One person suggests we switch to another Jacuzzi at a different location, claiming the filtration system there is stronger and capable of maintaining clean water even if someone were to use it inappropriately.

We kind of agree in theory but were…

— FRANCIS – BULLBITCOIN.COM (@francispouliot_) April 29, 2024

Pouliot voiced his annoyance over the occurrence, remarking that “the sole consequence is disrupting the testing processes for open-source Bitcoin app developers and unnecessarily consuming their valuable time.”

As an analyst, I would interpret the situation on Bitcoin Talk Thread differently, I’d say: I came across a heated debate labeled as the “testnet war,” where one participant accused Lopp of posing a risk to Bitcoin’s network security. The accuser recommended excluding Lopp from future testnet activities due to this perceived threat.

As a crypto investor, I’ve come across Weese’s comment on X, and it’s left me concerned. After the recent incident, I find myself struggling to keep up with the rapid generation of new blocks hourly. Regardless of how fast my system syncs, it seems an insurmountable task to catch up. Weese even proposed a drastic solution: permanently halting permissionless testing networks. This is a significant recommendation that could have far-reaching implications for the entire crypto ecosystem.

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2024-04-30 23:19