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Interoperability
Interoperability is the ability of separate blockchains to exchange information and assets. Blockchains are built in isolation with different rules, so they cannot talk to each other natively; bridges and similar systems are built to connect them.
What it means for you. Moving a token to another chain usually means a bridge issues a version of it on the other side, so what arrives can be a wrapped token whose value depends on that bridge. Bridge contracts have been hacked for very large sums, so check who runs a bridge and how it holds funds before using it.
Sources: ethereum.org: Bridges, ethereum.org: Bridges (developer docs) · checked 4 October 2026
Cross-chain messaging
Cross-chain messaging is a way for a smart contract on one blockchain to send instructions or data to a contract on another. It sits underneath many bridges: instead of only moving tokens, it can carry messages such as 'mint this', 'unlock that' or 'record this vote' between chains.
What it means for you. A message from another chain is only as reliable as whoever verifies it. If a small group of signers attests messages, that group colluding or being hacked can tell a contract to release funds that were never deposited. Before using a cross-chain app, check what verifies its messages: the chains' own validators, a light client, or an external committee.
Source: ethereum.org: Bridges · checked 4 October 2026