Cross-Chain Messaging

Token bridges are the visible layer, but underneath sits cross-chain messaging — generalized infrastructure that attests events on Chain A so Chain B can execute arbitrary logic. Wormhole, LayerZero, Axelar, and others compete to be the packet layer for multichain apps.

Wormhole uses a guardian network that signs observed events. LayerZero splits oracle and relayer roles so no single party can forge delivery. Axelar runs a proof-of-stake validator set with IBC-style routing. Each design makes different assumptions about decentralization, latency, and upgrade keys.

Post-exploit upgrades and bug bounties matter as much as whitepapers. Wormhole's 2022 hack pushed major security overhauls and reimbursement programs. When evaluating a messaging layer, ask who can pause it, upgrade it, and forge a message — not just which chains it lists on the landing page.