TAC Protocol Bridge
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anchored·612ZM3…WYmRSummary
TAC Protocol is an EVM-compatible Layer-1 blockchain built on Cosmos SDK that bridges Ethereum DeFi applications to the TON blockchain and Telegram ecosystem. On May 12, 2026, its cross-chain bridge was exploited for approximately $2.86 million — the protocol's entire TVL at the time — due to missing validation in sequencer software that allowed attackers to forge Jetton wallets. The attacker subsequently accepted a 10% white-hat bounty, returning roughly 90% of stolen funds to TAC's multisig; the bridge remains paused pending an independent security audit as of late May 2026.
Connected Entities
3 entities · 60 linked investigations- Cosmos (ATOM)→mentioned with→Ethereum(65%)
- TAC Protocol Bridge→mentioned with→Cosmos (ATOM)(65%)
- TAC Protocol Bridge→mentioned with→Ethereum(80%)
Community submissions
3 submissions awaiting moderator review.
Timeline(6 events)
15 July 2025
TAC Protocol launched its public mainnet with DeFi protocols including Curve, Morpho, and Euler deployed.
The Block11 May 2026
TAC Protocol disclosed the existence of a security vulnerability in the TON-TAC bridge sequencer software.
KuCoin News12 May 2026
Attacker exploited missing Jetton wallet validation in the bridge sequencer, draining approximately $2.86 million in USDT, BLUM, and tsTON — TAC's entire TVL. TAC bridge paused.
MEXC News14 May 2026
TAC recovered approximately 90% of stolen funds to its multisig wallet after the attacker accepted a 10% white-hat bounty (reported as ~13 ETH + 300 ZEC). TAC reclassified the incident as white-hat and announced it would not pursue litigation.
KuCoin News14 May 2026
TAC announced a compensation plan based on a legally structured sale of Foundation TAC token treasury reserves to make affected users whole. Specific timeline and sale details were not disclosed.
MEXC NewsDecision Log
- slot 445504359 · hash 5Y1VqfrJkx4Dn1f8Fqi8RT9Qos3hKzMXPXT9gCBMbf7F
- slot 423223281 · hash 3fdrteEiVuSGwirLQH9yeV6tLAjrEv873awAzJdiC9pT
- slot 423223278 · hash GneNGem39JN5BAC1ydxD9SrjSXF5cg459TKyXKhM1uzs
- slot 423153675 · hash ECqdMVr5B2q1Q3qy9AAThsG7fQjWQevxuFV3Yvdggu73
- slot 423153670 · hash 8xyz7w33DLUUSbU4Y73R4ZYxQk3eqsRVCxWooL1Cfhi4
- slot 422638384 · hash GF2f7nRX3gJNLqe1AFkmUnNPwWPA9S4As3G7ZrWMXPA8
This investigation is cryptographically anchored to the Solana blockchain (6 decisions). 9 of 9 cited source URLs have an Internet Archive snapshot.
model: claude-sonnet-4-6
generated: 5/28/2026, 3:27:09 AM
last updated: 5/28/2026, 3:27:09 AM
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