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ExitProof -> ReceiptValidationResult
Verify the inclusion of a child chain transaction receipt by validating its Merkle Patricia Trie proof against a validator-submitted checkpoint root on the root chain.
Problem it solves
Trustlessly proving that a specific transaction (such as a token burn) happened on a child chain before releasing funds on the root chain.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.