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QuadrigaCX discovered after its founder Gerald Cotten died that approximately $190 million in cryptocurrency held in cold storage wallets remained inaccessible because Cotten alone possessed the passwords and recovery keys required to unlock the encrypted systems.
Bitfinex introduced BFX tokens as a creative compensation mechanism for users whose bitcoin were stolen in the August 2016 hack, converting customer losses into equity-like claims.
The Bitfinex cryptocurrency exchange suffered a major security breach resulting in the theft of approximately 120,000 bitcoin, valued at around $72 million at the time.
An unknown attacker exploited a vulnerability in The DAO's smart contract code, draining approximately $60 million worth of ether tokens in a matter of hours.
ShapeShift, a cryptocurrency exchange platform, recovered from a security breach involving approximately $230,000 in stolen cryptocurrency, implementing new security measures.
