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# VAAs (Verified Action Approvals)
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VAAs are the core messaging primative in Wormhole. You can think of them as packets of xData. Any time an xDapp contract interacts with the Core Contract, a VAA is emitted.
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VAAs are the core messaging primative in Wormhole. You can think of them as packets of xData that are emitted any time an xDapp contract interacts with the Core Contract.
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The basic VAA has two components--a Header and a Body.
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