WISCH: Efficient data signing via correlated signatures

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We present WISCH, a commit-reveal protocol that combines compact aggregate signatures with hash-based commitments to enable selective disclosure of correlated data in multiparty computation. The protocol separates an on-chain verification core from off chain preparation, so that verification cost depends only on the number of openings, not on the size of the underlying message space. This yields asymptotic efficiency: on-chain cost grows linearly in the number of revealed items and is independen