The cross-chain liquidity protocol Symbiosis restored 15 bitcoins, worth approximately $1.1 million, after an attack on its Bitcoin bridge that occurred on Friday. The recovered funds were transferred to a multisig wallet controlled by the Symbiosis team.
The protocol stated that all routes remain operational, but the bridge itself is currently suspended. The attacker managed to issue 46.1 billion unsecured tokens through the Symbiosis Bitcoin bridge, but the net profit amounted to 4.3 Wrapped Bitcoin (WBTC), equivalent to $336,000, according to blockchain security data from Blockaid. It remains unclear how the restored bitcoins relate to the reported loss amount. Symbiosis also announced that it offers a 20% reward for information that helps recover the assets. Initially, the 20% reward was offered to the perpetrator for returning the funds, but the deadline expired on Sunday. The protocol stated that it would disclose the compensation mechanism for affected liquidity providers. The final assessment of losses incurred as a result of the attack has not yet been revealed. The total loss amount, according to DefiLlama, is $336,000.
Bridge attacks remain a pressing issue in DeFi: earlier, in June, the Secret Network lost about $4.6 million due to "infinite issuance," and in May, the Verus-Ethereum bridge was drained as a result of a fake cross-chain transfer of 5,402 ethers, then equivalent to $11.6 million. The hacker returned 75% of the stolen funds and kept about 1,350 Ether, or $2.8 million, the day after the protocol offered him a 25% white-hat reward.
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