A regulation that could facilitate cryptocurrency investments in the approximately $12 trillion US 401(k) retirement market has entered its final review stage before publication. The US Department of Labor prepared the text, which reached the Office of Information and Regulatory Affairs (OIRA), a White House office that reviews regulations, yesterday. Official records classify the measure as economically significant. The timing of OIRA's decision and publication remains uncertain because the office faces no legal deadline, and the final text has not been released.