Five Checks for a Token After a Cross-Chain Swap

After a cross-chain swap, check the destination chain, token contract and transaction before using the tokens. A wallet can show an unfamiliar asset with a familiar name, but names and symbols do not prove it is the token you meant to receive. A few checks can help explain what arrived and whether it behaves as expected.

How do you confirm the swap landed?

Check the destination chain’s transaction record and make sure it shows a completed transfer to your wallet. Cross-chain swaps involve activity on more than one blockchain, so a completed transaction on the source chain does not by itself confirm that the destination transfer finished. For more detail on the mechanics, see Biswap’s guide to Bitcoin-to-Ethereum swap mechanics. Then use the destination transaction record to check the recipient address and the amount of each token received.

Also confirm that your wallet is showing the destination network. The same wallet address can exist on several networks, but its balances and token contracts are separate on each one.

How do you verify the token contract?

Compare the token’s full contract address with a source you trust, such as the project’s official site or documentation. A contract address is the token’s unique identifier on that chain; its name and ticker can be copied by unrelated tokens. Check the address on the destination network’s block explorer, a site that displays blockchain transactions and contract details.

Make sure you are comparing the address for the right network and token version. A bridged token is a representation of an asset moved from another chain. It may have a different contract from the asset’s original version. The word “wrapped” often signals a token that represents another asset under a particular system’s rules.

What can the contract tell you about the token?

Look at the explorer’s contract details and whether the source code is verified, meaning the published code can be compared with the deployed contract. This can help identify how transfers work, but verification is not a safety rating. Some contracts are proxies: the visible address points to code that can be changed by an authorised party. Check whether the explorer identifies a proxy and who can update it.

Token code may also set rules for transfers, such as a fee or limits on who can send or receive tokens. If the code or project documentation describes such rules, check whether they fit the token you expected. A ticker or logo alone cannot show these details.

What should you check before using the tokens?

Compare the amount received with the destination transaction record, allowing for any fees or conversion terms shown before the swap. Check the token’s decimals too: these set how its smallest units are displayed, and an unfamiliar display can look like a wrong amount. If the amount or token identity does not match, wait before sending it elsewhere or approving it for another app.

• Confirm the destination network and completed transaction.
• Match the full contract address against a trusted source.
• Check whether the token is bridged, wrapped or the original version.
• Review transfer rules and any permission to update the contract.

The best check for most readers is the full contract address on the correct network, backed by the destination transaction record. A wallet label is convenient, but the address and transaction show which asset actually arrived.