The Federal Bureau of Investigation (FBI) and multiple cybersecurity companies have started investigating the US$100 million hack on Harmony Protocol’s Horizon cross-chain bridge.
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Harmony Protocol announced it was attacked on Friday morning Asia time, adding it had alerted exchanges of the suspect’s blockchain wallet address and halted the Horizon bridge.
The Horizon bridge allows users to transfer cryptocurrencies and assets from Harmony’s layer 1 blockchain to Ethereum, BNB Chain and Bitcoin.
Harmony Protocol said the exploit did not impact the trustless Bitcoin bridge, where assets are stored in decentralized vaults.
The theft may have taken place due to a compromised private key, PeckShield — the blockchain security firm tapped by Harmony — chief executive officer Xuxian Jiang reportedly told Bloomberg.
The hack on Harmony follows a string of attacks against blockchain bridges like Wormhole and the Ronin Bridge.
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