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Fairgate introduces WISCH: A correlated signature scheme for cost efficient data signing on Bitcoin

Recently unveiled in BTC++ Istanbul, WISCH is a correlated signature protocol that drastically diminishes on-chain data costs.
It reduces signing costs by at least 4x compared to Winternitz and 8x compared to Lamport or GC wire labels, making it a strong fit for efficient execution in BitVM-based systems.

We just wrapped up our session on WISCH, a new data signing scheme designed to considerably reduce onchain data costs compared to current alternatives such as Schorr or Winternitz signatures.

Stay tuned! WISCH Paper to be unveiled shortly 👀

Thanks to everyone who joined us! pic.twitter.com/RpsCEmiM98
— Fairgate (@FairGateLabs) September 5, 2025

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