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George Kadianakis
fe5a9db1e6
Fixes bug 40078. As reported by hdevalence our batch verification logic can cause an assert crash. The assert happens because when the batch verification of ed25519-donna fails, the code in `ed25519_checksig_batch()` falls back to doing a single verification for each signature. The crash occurs because batch verification failed, but then all signatures individually verified just fine. That's because batch verification and single verification use a different equation which means that there are sigs that can pass single verification but fail batch verification. Fixing this would require modding ed25519-donna which is not in scope for this ticket, and will be soon deprecated in favor of arti and ed25519-dalek, so my branch instead removes batch verification.