TAC Inner Bridge
TAC Inner Bridge is TAC's native lock-and-mint cross-chain framework connecting TON and TAC. It is included because its sequencer message-validation path was exploited in May 2026, causing unbacked minting on TAC and release of real locked assets on TON. TAC reported partial attacker-fund recovery and a Foundation backstop for the remaining shortfall, while the latest explicit reviewed first-party bridge state remained paused pending patched sequencer review and staged redeployment.
Bridge facts
- Canonical name
- TAC Inner Bridge
- Type
- Canonical Bridge
- Status
- Paused
- Confidence
- High
- Primary chains
- TON, TAC
- Primary assets
- USDT, BLUM, tsTON
- Operator
- TAC
- Ecosystem
- TAC
- Launch date
- Unknown
- End date
- Unknown
- Terminal reason
- Not applicable / unknown
- Last reviewed
- 2026-08-11
- Last verified
- 2026-08-11
Incident cases
TAC Inner Bridge 2026 jetton verification exploit2026-05-11
On May 11, 2026, TAC's TON-to-TAC sequencer path accepted messages from a counterfeit TON jetton wallet because canonical wallet code-hash and expected-minter provenance were not verified. The attacker minted unbacked equivalents on TAC and bridged them back through the legitimate return path to release real locked USD₮, BLUM, and tsTON assets on TON. TAC reported approximately $2.854 million protocol loss, approximately $2.291 million final net recovery, a Foundation commitment to cover the remaining shortfall, and a continued bridge pause pending patched sequencer review.
Evidence records
- Post-Mortem Report: TAC BridgeTAC · Tier 1 · 2026-05-20
- Post-Mortem Report: TAC Bridge Appendix II - Onchain TracingTAC · Tier 1 · 2026-05-20
Official URL status
Official URL recorded as live: https://tac.build/Help maintain bridge history
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