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15bd35824b
cosi.verify was renamed to verify_combined, because it is pretty much ed25519.verify, and the new name implies what it does in terms of the CoSi scheme: verify a signature with already-combined public keys. cosi.verify_m_of_n signature was simplified by not requiring the `n` parameter, which is not important for verification. The updated function was renamed to cosi.verify, because this is the standard CoSi verification operation: given signature, digest, required number of signatures, sigmask, and a list of public keys, verify that enough signatures are indicated and that they sign the digest.