EIP-712 domain separator missing chainId

Usual (USD0 / bUSD0 / USUAL)'s assessment for RD-F-020 — scored green on the v1.7.0 rubric. The evidence below is the curator's reasoning for this score.

Evidence summary #

DaoCollateral uses EIP712Upgradeable (OZ, includes chainId in domain separator). USD0 uses ERC20PermitUpgradeable (also includes chainId). OZ's EIP-712 implementation correctly handles chain separation.

Sources #

Etherscan
DaoCollateral Implementation — EtherscanDaoCollateral impl — EIP712Upgradeable confirmedretrieved 2026-05-17
Etherscan
USD0 Implementation — EtherscanUSD0 impl — ERC20PermitUpgradeable with chainIdretrieved 2026-05-17

Methodology #

Determine whether the EIP-712 domain separator struct omits the `chainId` field, allowing cross-chain replay.

See the full factor methodology and distribution across all protocols →

rubric_version v1.7.0 protocol usual factor RD-F-020 score green collected_at 2026-05-16 20:39:44