BIP352: ECDSA verify compare x(R) modulo n to r #1959
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jonatack
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Proposed BIP modification
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The signer computes r = x(R) mod n, but the verifier compared the affine x-coordinate directly to r. This could incorrectly reject valid signatures when x(R) ≥ n (rare but possible). Update ECPubKey.verify_ecdsa to check (x(R) % n) == r, aligning verification with ECDSA as defined in SEC1/FIPS 186 and matching our signer’s behavior.