ssh-ed25519 is different from a gnupg ed25519 key, since it doesn't have any of the technical baggage that gnupg has. Even with ed25519, sha1 is still hardcoded

ssh-ed25519 is different from a gnupg ed25519 key, since it doesn't have any of the technical baggage that gnupg has. Even with ed25519, sha1 is still hardcoded into RFC4880, the standard that gnupg implements. Fingerprints are typically 40 characters long since they are hex sha1 hashes. There's RFC9580 that changes this to sha256, but it's still very new and currently being finalized. But even then, when using ed25519+sha256 to generate a signature, you're still going to do this over a sha1 hash because of the way git works.