French police are investigating a series of kidnappings of investors linked to cryptocurrency after a 60-year-old man had a finger chopped off by attackers who demanded his crypto-millionaire son pay a ransom. This was the latest of several kidnappings of cryptocurrency figures in France and western Europe. Police rescued the victim from a house south of Paris on Saturday night. Other abductions of cryptocurrency figures or their partners were reported in Spain and Belgium in the past five months. David Balland, the co-founder of the crypto firm Ledger, which is valued at more than $1bn, was abducted with his partner on 21 Jan. He also had a finger cut off.