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In 1987, Valerio Viccei stole an estimated $97 million in cash and valuables when he broke into safe deposit boxes in London. Two decades after that, a gang of thieves dug a 256-foot tunnel that led to a bank in Brazil and a cool $71.6 million payday.

Not bad. But those historic heists have nothing on what potentially went down this week in cyberspace, where some $1 billion in digital currency — 69,369 bitcoins
— was moved from the fourth richest wallet in the world.

According to London-based blockchain analysis firm Elliptic, the vast sum, which had been dormant for several years, may have ties to Silk Road, the online black market that was shut down in 2013. Ross Ulbricht, the man behind Silk Road, was in 2015 sentenced to life in prison.

“The movement of these bitcoins … may…

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