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This guide is intended to provide a non-exhaustive set of techniques to invest in Bitcoin through retirement plans (401k, IRA, etc.) in the US. There are many types of retirement plans that provide various tax advantages, including tax-deferred and tax-exempt benefits. Bitcoin index funds are probably the easiest for beginners to start with. At this point, I would only recommend Grayscale Bitcoin Trust if you’d like to. invest in a Bitcoin index fund with your retirement plans. All other options require you to be an accredited investor.