Major US Banks Expand into Bitcoin Services for Clients

The evidence strongly supports the truthfulness of the statement. There is direct, high-quality evidence from multiple sources confirming that at least one major U.S. bank has launched crypto-related services. A highly authoritative legal resource, Thomson Reuters' Practical Law, explicitly states that BNY Mellon, a major U.S. bank, has started offering digital asset custody services. This claim is corroborated by a financial news article from ainvest.com, which also names BNY Mellon as a custodian for digital assets. Furthermore, a primary source from the Office of the Comptroller of the Currency (OCC) confirms the legal and regulatory foundation for national banks to provide these services, which adds significant plausibility to the claims. While the primary source links for Morgan Stanley and J.P. Morgan are general pages and do not contain specific announcements, the consistent and explicit reporting on BNY Mellon's activities is sufficient to validate the statement that major U.S. banks 'have begun' this process. There is no conflicting evidence among the provided sources.