I'm sure the perfectly mysterious Bitcoin creator-god choosing SHA-256 for hashing isn't much of an issue, either.
First sentence on Wiki - "SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA)"
I dunno. Bitcoin's creator picked secp256k1 over secp256r1 for a reason and probably a good reason at that.
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You bet they did.