The seven, who could face long prison terms up to life, are among 10 people taken into custody late Thursday as anti-gang investigators probe the case.
Another Ledger co-founder, Eric Larcheveque, alerted police to the kidnapping after receiving a video showing a mutilated finger belonging to Balland, and a ransom demand, according to a source close to the case.
His partner, taken to a different location by the presumed kidnappers, was found tied up in a car.
The kidnappers asked for “a large cryptocurrency sum”, Beccuau said, without saying how large, with part of it handed over during negotiations handled by police before most of the crypto assets were seized and frozen.
They face charges of gang-related kidnapping, acts of torture and armed extortion.
Their lawyers have so far declined to comment.
Founded in 2014, French company Ledger is a so-called “unicorn” -- a privately held startup worth more than $1 billion -- and world leader in digital wallets and vaults to safeguard crypto assets.
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