A user may see one account experience, but fiat and stablecoin movements have different providers, settlement models, network risks and reconciliation requirements. Nexus therefore treats the rail, asset and blockchain network as explicit attributes of every external movement.
USDT on TRON and USDT on Ethereum may represent the same token denomination to a user, but operationally they are different rails. Network identity must remain visible through deposit, confirmation, treasury and payout processing.
This approach keeps accounting and risk controls clear while still allowing a unified account interface above the ledger.