USDT representation on both sides
The input must match the selected ERC-20, TRC-20, SPL, or other USDT representation; each standard has different address, approval, and fee behavior. Confirm whether the output is ERC-20, TRC-20, SPL, or another USDT standard; a wallet supporting one standard may not credit another. The same stablecoin ticker does not make the two network records or contracts interchangeable.
ETH source gas and ETH destination readiness
An OP Mainnet source uses sequenced OP Stack execution and ETH gas; ordinary route processing is not the same as the canonical L2 withdrawal delay. A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll.
Optimism to Scroll L2 handoff
This route crosses two L2 execution environments. Optimism settles to ethereum, while Scroll settles to ethereum; each side keeps its own gas balance, token contracts, transaction hash, and settlement progress.
Optimism deposit-side execution
Optimism is a L2 EVM network in the Ethereum ecosystem. ETH pays source-side network gas on Optimism. EVM 0x account address An OP Mainnet source uses sequenced OP Stack execution and ETH gas; ordinary route processing is not the same as the canonical L2 withdrawal delay.
Scroll receipt-side execution
Scroll is a L2 EVM network in the Ethereum ecosystem. ETH pays destination-side network gas on Scroll. EVM 0x account address A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll.
Optimism to Scroll bridge mistakes
Route-specific mistakes include sending on a network other than Optimism; using a destination that is not valid for Scroll; running out of ETH before the source transaction is submitted; selecting a stablecoin by ticker without checking its network contract. An OP Mainnet source uses sequenced OP Stack execution and ETH gas; ordinary route processing is not the same as the canonical L2 withdrawal delay. The input must match the selected ERC-20, TRC-20, SPL, or other USDT representation; each standard has different address, approval, and fee behavior. A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll. Confirm whether the output is ERC-20, TRC-20, SPL, or another USDT standard; a wallet supporting one standard may not credit another.