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Canada's leading cryptocurrency exchange company has said it cannot repay $190m (£110m) to clients because its founder died with their passwords.
QuadrigaCX's founder Gerald Cotten, 30, died "due to complications with Crohn's disease" while travelling in India to open an orphanage in December, his wife Jennifer Robertson said.
Mr Cotten held "sole responsibility for handling the funds and coins" and no other members of the team could access the stored funds, she said in a sworn affidavit as she filed for credit protection on 31 January.
Ms Robertson said about $190m (£110m) in both cryptocurrency and normal money is in "cold storage" - where the company, or just Mr Cotten in this case, holds the key, not the client.
The founder held "sole responsibility for handling the funds and coins" and no other members of the team could access the stored funds, she added.
Ms Robertson added in the affidavit that she and her colleagues have had threats made against them from online cryptocurrency communities - especially from Reddit users.
On 31 January the company's board of directors applied for creditor protection, with Ernst & Young expected to be appointed on Tuesday to oversee the proceedings.
A statement from the board said: "For the past weeks, we have worked extensively to address our liquidity issues, which include attempting to locate and secure our very significant cryptocurrency reserves held in cold wallets, and that are required to satisfy customer cryptocurrency balances on deposit, as well as sourcing a financial institution to accept the bank drafts that are to be transferred to us.
"Unfortunately, these efforts have not been successful."
QuadrigaCX customers have been complaining on social media that they have not been able to withdraw money from their accounts.
Ally Shapoval wrote: "Hello, Quadriga! I withdrew money from my Quadriga account to my bank more than 2 weeks ago. WHERE IS MY MONEY? STILL NOT THERE.
"I sent you emails, you are not responding."
Another wrote in French: "I have sent lots of emails, but I just get automatic responses, I'm not even able to get my crypto out."
Some are questioning whether Mr Cotten is even dead and others have accused the company of lying to them.