Federal departments are now working out regulatory details for paving the way for alternative investments in 401(k) plans.

Michigan's largest public pension plan held $44 million in bitcoin and $30 million in ethereum exchange traded funds as of Sept. 10, totaling $74 million.

Detroit's 'Bitcoin Butcher' and other cryptocurrency advocates say the door will be open to more investors.

And if deciding how to invest 401(k) money isn't perplexing enough, we soon could be staring down some ridiculously overwhelming new options — including whether to buy bitcoin or turn to private equity as a way to juice up retirement returns.

The U.S. Securities and Exchange Commission, the Labor Department and the Treasury are tasked now with working out regulatory details for paving the way for alternati

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