Arthur Levitt, the longest-serving chairman of the Securities and Exchange Commission, is joining the advisory boards of two bitcoin-focused companies.

As an adviser to Atlanta-based BitPay, a bitcoin payment processor, and Vaurum, a Palo Alto-based bitcoin exchange for institutional investors, Mr. Levitt says he hopes to “help them understand the imperative of a robust approach to regulation” if bitcoin is to fulfill its promise to further shake up the world of finance. The appointments will be formally announced Tuesday.

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