The assessment is based on a strong convergence of evidence from multiple high-authority sources directly affiliated with the European Central Bank (ECB). Several sources, including the ECB's official news and publications page and the profiles of ECB authors Elisa Reinhold and Senne Aerts, explicitly and consistently point to a specific publication: the 'Financial Stability Review'. These sources confirm that this review contains a dedicated section (a 'Box') on the topic of 'Stablecoins on the rise' and their surging market capitalization. A secondary source (Reuters article) further corroborates that the ECB released a review in May discussing the crypto market. While the provided summaries do not contain the exact figure of "$280 billion," the evidence overwhelmingly indicates that the ECB has published an official report on this precise subject matter. The high authority of the sources and the direct pointers to a relevant primary document make it highly probable that the specific data point in the statement originates from this ECB report. There is no conflicting evidence among the provided sources; the lower-quality sources are simply less relevant and do not contradict the findings from the high-authority ones.