(Bloomberg) -- Bakkt Holdings Inc., the digital-asset marketplace launched by the parent of the New York Stock Exchange, is exploring a potential sale amid a spike in crypto-related takeover activity, according to people familiar with the matter. Most Read from BloombergReal Estate Investors Are Wiped Out in Bets Fueled by Wall Street LoansBehind ‘Suicide Squad,’ the Year’s Biggest Video-Game FlopVietnam Tycoon Sentenced to Death Faces New Charges: MediaPutin’s Wartime Central Banker Tells Him W