Developer's crypto fact-checker falsely confirmed a wallet group with zero members

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A software developer built an open-source tool to fact-check crypto claims by querying Nansen's API and returning verdicts such as CONFIRMED or UNVERIFIABLE. The tool malfunctioned last week, returning CONFIRMED for a claim about a whale wallet group that Nansen's data showed had zero tagged members. The bug stemmed from a missing presence check in the code branch handling 'holding' claims, even though the developer had already documented Nansen's sparse whale-labelling as a known limitation. The flow and buying/selling branches correctly called a presence-verification function before issuing verdicts, but the holding branch skipped this step entirely and defaulted to CONFIRMED. The developer has publicly disclosed the error, shared the relevant code, and noted the flaw was effectively pre-warned in the repository's own documentation.

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