Are multisigs possible in MimbleWimble?

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Schnorr threshold signatures, such as FROST [1], are certainly possible, but the challenge is to extend them to rangeproof construction. I’m not aware of any research/publications on that.

[1] FROST — Flexible Round-Optimized Schnorr Threshold Signatures | Cryptography, Security, and Privacy (CrySP) | University of Waterloo

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