The assessment is "likely_true" with high confidence based on a synthesis of the provided high-authority sources. The statement has two key components: 1) action by U.S. banks to purchase Bitcoin, and 2) the timing of this action during market panic.First, the element of "market panic selling" is strongly supported. One source explicitly links JPMorgan's crypto trading activities for clients to the period of the FTX collapse. Another source reinforces this by citing a JPMorgan analyst's statement that a significant Bitcoin sell-off was potentially "bottoming out," which directly points to a major U.S. bank analyzing market conditions during a panic.Second, the "purchased Bitcoin" component is substantiated by multiple sources reporting that another major U.S. bank, Morgan Stanley, filed for spot Bitcoin ETFs. Operating a spot ETF necessitates the purchase and holding of the underlying asset (Bitcoin) to back the ETF shares. This represents a clear mechanism for a U.S. bank to acquire Bitcoin exposure. While the sources about Morgan Stanley's ETF filings do not specify the timing relative to a market panic, they confirm the purchasing intent and action by a major U.S. bank.When combined, the evidence paints a cohesive picture. We have confirmation of a major U.S. bank (JPMorgan) being actively engaged and identifying potential buying opportunities during a market panic, and we have confirmation of another major U.S. bank (Morgan Stanley) taking concrete steps that involve purchasing Bitcoin. As the statement refers to "United States banks" (plural), the collective evidence from different banks supports the overall claim. The irrelevant sources provided do not contradict this finding.