Native track
Top-level value and synthetic transfer evidence use native decimals.
Guide
Arc and USDC
Native 18-decimal and ERC-20 6-decimal USDC remain separate until live verification makes aggregation safe.
ERC-20 track
Transfer logs at the configured USDC contract use ERC-20 decimals.
No combined balance
When nativeUsdcAggregationSafe is false, combined fields remain null.