Symbiosis Recovers 15 BTC After Attacker Mints Billions of syBTC

Cross-chain liquidity protocol Symbiosis has recovered approximately 15 BTC after an attacker exploited its Bitcoin Bridge on September 11. The attack resulted in the minting of roughly 46.1 billion unbacked syBTC, but the attacker was only able to sell around 4.39 WBTC for $336,000.

The protocol's native Bitcoin Bridge remains paused, while routes involving EVM networks, TRON and TON continued to operate. Symbiosis has not disclosed a final loss figure, saying its accounting work is still underway as it contacts liquidity providers affected by the incident.

The recovered bitcoin has been moved to a team-controlled multisig wallet. Symbiosis offered a 20% bounty for further fund recovery while its native Bitcoin Bridge remains paused. The protocol initially offered the attacker a white-hat bounty equal to 20% of the funds if the remaining assets were returned by September 13.