2.1 Cross-chain bridge Cross-chain bridge is also called token bridge, namely bridge among tokens, what it solves is the issue of on-chain exchange of protocol tokens among different public chains (like between the ETH chain and the Solana chain). In principle, cross-chain bridge is seemingly a chain-crossing of assets, but is essentially cross-chain of "messages".
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B. Meta-Asset Bridge
2.1 Cross-chain bridge
Cross-chain bridge is also called token bridge, namely bridge among tokens, what it solves is the issue of on-chain exchange of protocol tokens among different public chains (like between the ETH chain and the Solana chain). In principle, cross-chain bridge is seemingly a chain-crossing of assets, but is essentially cross-chain of "messages".