The U.S. Department of Labor has proposed a rule that could enable $12 trillion in 401(k) retirement funds to invest in cryptocurrencies, including Bitcoin. This rule, currently in a 60-day public comment period, emphasizes fiduciary responsibility and compliance with the Employee Retirement Income Security Act (ERISA). If implemented, it would provide legal protections for fiduciaries, allowing them to include digital assets in retirement portfolios without personal liability, even if asset prices decline. The rule anticipates that target-date funds will be the primary vehicle for cryptocurrency investments, automatically allocating a small percentage of retirement portfolios to digital assets. This shift could channel significant capital into the crypto market, with even a 1% allocation directing approximately $120 billion into digital assets. However, concerns remain about the potential risks, as a significant drop in crypto prices could impact retirement savings, and the rule's legal protections have yet to be tested in court.