A token bearing the same name on two chains is usually not the same instrument. The version on the second chain is a claim, and understanding who issued it explains most of the risk involved.
Assets do not move between chains
A blockchain can only modify its own state. There is no mechanism for a coin to leave one ledger and appear on another.
Bridges simulate movement by locking the original on the source chain and issuing a representation on the destination chain.
The representation is a new token created by the bridge's contract. Its entire backing is the locked collateral and the bridge's continued ability to honour redemption.
The claim inherits the bridge's security
If the locked collateral is stolen or the issuing contract is compromised, the representation on the destination chain becomes unbacked.
Holders are left with a token that trades on its own market and can fall to near nothing, while the original asset is entirely unaffected.
This is why bridge failures have been among the largest losses in the sector, and why the security model of the bridge matters more than the security of either chain it connects.
Bridges differ in who is trusted
Some rely on a set of signers who confirm that a deposit occurred, which means trusting that group not to collude and not to be compromised.
Others verify the source chain directly using a light client running as a contract, which removes the external trust but is expensive and harder to build.
Canonical bridges operated by a rollup are a distinct case, since their security derives from the same proof system that secures the rollup itself.
Multiple versions of one asset can coexist
Where several bridges serve the same route, each issues its own representation, and they are not interchangeable despite having similar names.
Liquidity fragments across these versions, and a swap interface may route through one while a lending market accepts only another.
Users discover the distinction when a transfer arrives in a form the destination application does not recognise, which is a labelling problem with real financial consequences.
How to tell what you are holding
The contract address is the only reliable identifier. The displayed name and symbol are chosen by whoever deployed the contract and can be anything.
Checking which bridge issued a token, and how that bridge is secured, is the same kind of question as asking which institution issued a deposit receipt.
Where a chain has a native issuance from the original asset's issuer, that version carries different risk from any bridged one, and the two should not be treated as equivalent simply because they share a ticker.