Blockchains do not automatically share a single ledger. A bridge carries messages or asset representations between networks so users can move value or use applications elsewhere.
Lock, mint, burn, and release
A common design locks an asset on the source network and mints a representation on the destination. Returning can burn the representation and release the original. Other bridges use liquidity pools or native issuer mechanisms.
The visible transfer is therefore a sequence of contracts and messages, not a coin physically travelling between blockchains.
Bridging often creates a representation
A bridge may lock an asset on one network and issue a corresponding token on another. The destination token depends on the bridge mechanism and its ability to honor the relationship.
The bridge adds a security model
A bridge may depend on validators, multisignature signers, an oracle, a light client, or cryptographic proofs. Bugs or compromised operators can put locked funds and bridged tokens at risk.
Check the official route, supported token, destination address, fees, limits, and expected arrival time. A test transfer can reduce operational mistakes but cannot remove protocol risk.
A bridge becomes an additional security boundary
Validators, multisignature keys, relayers, or smart contracts may control cross-chain messages. A secure source chain does not remove those extra dependencies.
Sources
Educational information, not investment advice.