Is it possible to use ed25519 for account key pairs on a substrate based blockchain instead of the default?

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Sure, it's totally possible.

This is how moonbeam did to use ECDSA.



Basically, you just need to define the Ed25519Signature and implement those traits. And let the <<Ed25519Signature as Verify>::Signer as IdentifyAccount>::AccountId; as your AccountId.

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