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(CampaignID, ClaimerAddress, ECDSA_Signature) -> MintedToken
Verify an off-chain backend's ECDSA signature to authorize a user's on-chain token/NFT claim.
Problem it solves
Verifying complex off-chain credentials (e.g. social media actions) directly on-chain is impossible or gas-prohibitive.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.