Bitcoin exchange that collapsed a decade ago after being hacked is expected to return cryptocurrencies worth billions of dollars to their users, which has created concern among investors.

In a few days, the bankrupt Tokyo-based bitcoin exchange Mt Gox will begin returning $9 billion worth of cryptocurrencies to their users. The platform collapsed in 2014 when it was revealed that it had been hacked as a result make wings about 650,000 – 950,000 cryptowhich in today’s value correspond to over 59 billion dollars.

The return of the cryptocurrencies follows the exchange’s bankruptcy proceedings, which were marked by multiple delays and objections.

On Monday, the court-appointed special trustee in charge of the bankruptcy process said that the return of the cryptocurrencies to approximately 20,000 company customers will start in early July. The return will be made through a combination of bitcoin and bitcoin cash (an early bitcoin product that is essentially the equivalent of cash).

The news is positive for the victims of Mt. Gox, who waited years to be reimbursed.

CNBC spoke with analysts asking for their thoughts on what we should expect when 141.00 bitcoins – about 0.7% of the total number of bitcoins in circulation– be returned to the victims of Mt. Gox.

Pressures on bitcoin may increase

The Mt. Gox (short for “Magic: The Gathering Online Exchange”) was once the world’s largest spot bitcoin exchange. It even claimed to handle about 80% of all dollar transactions for bitcoin.

When it collapsed, in February 2014, each bitcoin was worth about $600.

Although last week, the price of bitcoin fell to $59,000, recording the second biggest weekly drop this year, on Monday it rebounded to $62,000. This means that the victims of Mt. Gox to be compensated in bitcoin, will see a spike in the value of their cryptocurrency over 10,000%.

THE John Glover, chief investment officer at cryptocurrency firm Ledn, told CNBC that this return to users of Mt. Gox may lead to a massive selloff of bitcoin as investors are likely to attempt to lock in their gains.

“It is clear that many of the users will liquidate the cryptocurrencies, enjoying the fact that their investment, which was in the hands of the bankrupt Mt. Gox, was the best they ever made,” said Glover. “Some they will choose to simply take the money and run” completed.

THE James Butterfill, head of analysis at CoinShares, told CNBC that the $9 billion worth of bitcoins returning to the market “has long been a cause for concern among those who believe the cryptocurrency will rise.”

“Consequently, the market is very sensitive to news related to this issue. And with the announcement that the bankrupt exchange will start returning bitcoins to their owners in July, investors’ concern is justified,” added Butterfill.