Key Takeaways
- On September 11, a hacker exploited a vulnerability in Symbiosis’s Bitcoin Bridge, generating approximately 46.1 billion synthetic BTC tokens without proper backing
- Despite the massive token creation, the attacker only managed to liquidate roughly 4.39 WBTC via Uniswap, securing approximately $336,000 in actual funds
- The protocol successfully recovered around 15 BTC, currently stored in a multisignature wallet managed by the team
- A white-hat bounty worth 20% was extended to the exploiter, with September 13 set as the acceptance deadline
- This marks the third Bitcoin bridge unbacking attack within recent weeks, following similar incidents at Liquid Network and Nomic
On September 11, 2026, cross-chain platform Symbiosis disclosed that its Bitcoin bridge infrastructure had been breached. A malicious actor discovered and exploited a critical weakness in the BridgeV2 smart contract, enabling the creation of billions of counterfeit synthetic bitcoin tokens.
Blockchain security company Blockaid initially detected and publicly announced the breach. According to their analysis, the exploiter successfully generated approximately 46.1 billion syBTC—an amount exceeding 2,000 times Bitcoin’s actual total supply. These fabricated tokens were transferred to a newly created wallet address.
While the quantity of counterfeit tokens was enormous, the attacker faced severe liquidity constraints. They managed to exchange only about 4.39 wrapped bitcoin via Uniswap on the Ethereum network, securing roughly $336,000 in proceeds. The remaining minted tokens found no market demand.
Following the breach, Symbiosis acknowledged the security incident and immediately suspended its native Bitcoin routing services. However, the protocol maintained operations across other networks, including EVM-compatible chains, TRON, and TON. Additionally, the platform’s Octopools feature continued functioning normally.
Protocol Recovers 15 BTC and Extends White-Hat Offer
According to Symbiosis’s official statement, the team has successfully retrieved approximately 15 BTC from the exploit. Based on current market valuations, this recovered amount represents roughly $1.15 million. These funds are currently secured in a multisignature wallet under team control.
The development team extended a white-hat proposal to the attacker, offering a 20% bounty on the compromised funds. This proposal carried a September 13 deadline for acceptance. Following that cutoff, Symbiosis announced it would redirect the same 20% incentive toward any party providing actionable intelligence that facilitates additional fund recovery.
The platform indicated it is engaging directly with impacted liquidity providers. A comprehensive compensation plan is under development, with specific eligibility requirements scheduled for publication in the near future. Meanwhile, Bitcoin swap functionality has been reinstated through partnerships with third-party services Chainflip and THORChain, while the native bridge infrastructure remains disabled.
Wave of Bitcoin Bridge Compromises Continues
This security breach represents part of an alarming trend. Over recent weeks, both Liquid Network and Nomic experienced comparable attacks involving unbacked Bitcoin-wrapped assets.
Blockstream’s Liquid Network suffered an incident where an attacker fabricated approximately 4,000 unbacked LBTC tokens and exchanged them for authentic Bitcoin. The exploiter subsequently returned around 3,400 BTC, though Blockstream declined to provide a bounty for the remaining 598.5 BTC that remains unrecovered.
Nomic experienced a distinct security flaw that remained undetected for several months under comparable circumstances. All three breaches employed fundamentally identical methodologies—manipulating Bitcoin wrapper protocols to issue excessive tokens purportedly backed by legitimate assets.
As of September 13, Symbiosis has not released a comprehensive technical analysis detailing precisely how the BridgeV2 contract was exploited. Additionally, no public confirmation has emerged regarding whether the attacker accepted the bounty proposal.
Since its launch approximately five years ago, Symbiosis has facilitated over $10 billion in cumulative transaction volume. The protocol currently maintains approximately $7 million in total value locked.
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