If a token’s contract on the destination chain has changed, check the project’s migration rules before bridging. A bridge moves a token between networks, but may not convert an old version into a new one. Confirm which contract you should receive before approving a transaction.
- A matching token name does not prove the contract is current.
- Bridging and migrating are separate steps unless the project says otherwise.
- Check the destination contract and migration rules before moving funds.
What changes when a token gets a new contract?
A token contract is the code and address that define a token on one network. When a project replaces its contract, the old token may still appear in your wallet, but apps may stop accepting it.
Think of the old and new contracts as two versions of a ticket. They may show the same project name, but only the current version may get you into the event. A bridge can carry the old ticket to another network without exchanging it for the new one.
Should you migrate before bridging?
Follow the project’s migration instructions: they decide whether to migrate first, bridge first, or use a supported route that does both. A migration may ask you to swap old tokens for new ones, deposit them in a migration contract, or claim new tokens based on a past balance snapshot.
If the project supports migration only on one network, you may need to bridge there before migrating. Check whether the migration accepts your token on that network; the same project token can have different contracts across Arbitrum, Base, Polygon, and Optimism.
For a cross-chain transfer, bungee bridge can help make the route tangible: inspect the token and network shown in the transfer preview, because the route’s destination token is what your wallet receives. A route that reaches the right network can still leave you holding an older token version.
What should you check before approving?
Compare the destination token’s contract address with the address in the project’s official migration notice. A contract address is a unique identifier; the token name and symbol can be copied. Use the destination network’s block explorer, such as BaseScan or Arbiscan, to check the address and transaction details.
Then check the route’s final amount, fees, and any extra steps. You may pay network fees on the source chain, a bridge fee, and a swap fee if the route exchanges tokens. Keep some of the destination network’s native token for later transaction fees.
- Project migration notice: supported networks, deadlines, and exchange rate.
- Destination contract address: match it character for character.
- Transfer preview: confirm the token, destination network, and amount received.
- Wallet prompt: check the network and what the approval lets the contract spend.
With a bungee bridge route, treat the preview as a proposed route, not proof that a project’s migration is included. If it shows an old contract, pause and confirm the project’s instructions before sending.
What if you bridged the old token already?
First, check the destination transaction in the block explorer and identify the contract address of the token received. If it is the old version, look for a migration process that accepts tokens on that network; do not send them to a new contract address as if it were a wallet.
A snapshot migration has a special edge case: eligibility may depend on which wallet held the old token at a specific block. Bridging after that block can change who appears eligible, so check the project’s snapshot rules before moving tokens. For a small test, use only an amount you can afford to lose, and remember it still costs network fees.
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