One of the world's biggest cryptocurrency firms, Coinbase, says a recent cyber attack will cost it up to $400m (£301m).

Instead of paying the $20 million ransom, Coinbase offered the same amount of money for information leading to the attackers.

Coinbase faces $400 million breach, refuses $20 million ransom, offers bounty for attackers, and plans to join S&P 500.

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Coinbase has refused to pay a ransom demand of $20 million from the attackers and is working with law enforcement agencies.

Coinbase, the largest cryptocurrency exchange based in the U.S., said Thursday that criminals had improperly obtained ...