The appointment brings a veteran of a major credit card network player to the company’s board at a time when cryptocurrency firms are looking to establish higher trust and credibility.

Donald Trump has offered a flurry of pardons since taking office earlier this week, including one for the Silk Road creator Ross Ulbricht.

David Balland, co-founder of Ledger, was kidnapped from his home in France and held captive for approximately 24 hours before being rescued by local law enforcement. The kidnappers demanded a ransom, ...