Symbiosis Recovers 15 BTC After Bridge Exploit, Offers 20% Bounty to Attacker

Symbiosis disclosed that it has retrieved 15 BTC after a security breach on its Bitcoin bridge, which allowed the creation of an estimated 46.1 billion synthetic BTC (syBTC). The exploit generated a large amount of synthetic tokens, but the attacker was able to cash out only a fraction of the value.

Scale of the Exploit

Blockchain security firm Blockaid reported that the exploit resulted in the minting of approximately 46.1 billion syBTC. Despite the massive token creation, the attacker’s realized proceeds were limited to roughly $336,000.

Recovery Effort and Bounty Offer

Symbiosis confirmed the recovery of 15 BTC and announced a bounty equal to 20% of the recovered amount for information leading to the identification of the attacker.

Implications for Bridge Security

The incident highlights the risks associated with cross‑chain bridges and the importance of robust security audits. While the recovered BTC mitigates some losses, the event underscores the need for continued vigilance in the decentralized finance ecosystem.