Storage-layout collision risk across upgrades

USDD (Decentralized USD)'s assessment for RD-F-142 — scored not_applicable on the v1.7.0 rubric. The evidence below is the curator's reasoning for this score.

Evidence summary #

Canonical Ethereum USDD ERC-20 (0x4f8e5de400de08b164e7421b3ee387f461becd1a) is not a proxy contract — direct, non-upgradeable implementation. No storage-layout collision risk from upgrades applicable. TRC-20 on TRON: TVM architecture, not EVM proxy pattern. N/A by contract architecture.

Sources #

Etherscan
USDD canonical ERC-20 — confirmed non-proxy direct implementationEtherscan 0x4f8e5de400de08b164e7421b3ee387f461becd1a (canonical, 5,863 holders) — non-proxy contract confirmed (no proxy admin slot, standard ERC-20)retrieved 2026-05-17

Methodology #

Determine whether the OZ upgrades-plugin or manual review flags a storage-layout collision risk between implementation versions.

See the full factor methodology and distribution across all protocols →

rubric_version v1.7.0 protocol usdd factor RD-F-142 score not_applicable collected_at 2026-05-17 11:34:18