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Assuming this is the paper you're talking about, your modification completely eliminates resilience to collisions in the underlying hash function $H$. The EdDSA scheme (and in the Schnorr scheme on which it is based) is highly resilient against collisions in $H$. Specifically, in the generic group model, the Schnorr scheme has been proven to be secure even ...


Here are some test vectors for secp256k1 in the spirit of the test vectors you referenced: Curve: secp256k1 ------------- k = 1 x = 79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798 y = 483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8 k = 2 x = C6047F9441ED7D6D3045406E95C07CD85C778E4B8CEF3CA7ABAC09B95C709EE5 y = ...

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