Before tools like Arkham, Nansen, and Chainalysis, investigating a crypto hack was slow manual work. Investigators would trace fund movements wallet by wallet, looking for patterns that might identify the attacker or predict where the funds were headed next. Some investigations took months. Many ended with the hackers successfully laundering funds through mixers or bridges before anyone could react.
Today, the response time to a major hack is sometimes minutes. When the Ronin bridge was drained for $625 million in March 2022, onchain analysts had the attacker’s wallet graph mapped within an hour of the incident. When the Wormhole exploit happened in February 2022, wallets that received the stolen funds were tracked in near real time. When FTX wallets started moving suspiciously during the November 2022 collapse, onchain sleuths caught the activity before the company’s own announcement.
The tooling has created a new profession: onchain investigator. Pseudonymous researchers like ZachXBT have built reputations (and large followings) purely by tracing stolen funds and exposing bad actors. ZachXBT’s investigations have directly led to arrests, recovered tens of millions in stolen assets, and forced protocols to blacklist addresses before criminals could cash out. His work demonstrates what onchain transparency makes possible at its best: a kind of distributed law enforcement run by volunteers with SQL access.
The dark side of this is that the same tools can be used against innocent users. Stalking, targeted phishing, and “wrench attacks” (physical coercion after seeing someone’s holdings) have all been enabled by public onchain data. The arms race between attackers and defenders in crypto is now running on the same infrastructure — Arkham, Nansen, Dune — and the outcomes depend entirely on who gets to the data first. That’s a new kind of security landscape, and the industry is still figuring out how to live with it.
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