I have defined an extrinsic function as follows

        pub fn create_record(
            origin: OriginFor<T>,
            issuer_account: T::AccountId,
            input: Data<T::PublicKeySize, T::SignatureSize>,
        ) -> DispatchResult {
            let _who = ensure_signed(origin)?;
            let generated_public_key_from_bytes = Public::from_slice(&input.public_key)
                .map_err(|_| Error::<T>::InvalidPublicKey)?;

            let generated_signature_from_bytes = Signature::from_slice(&input.signature).ok_or(Error::<T>::InvalidSignature)?;


            let is_signature_valid = generated_public_key_from_bytes
                .verify(&input.public_key, &generated_signature_from_bytes)

                // more code here


When I try to call verify function it says its not found. Im using polkadot version 0.9.42 This public key is an ED25519 Key ,

The errors which Im getting

error[E0599]: no method named verify found for struct sp_core::ecdsa::Public in the current scope

and gives this suggestion

help: the following trait is implemented but not in scope; perhaps add a `use` for it:
32  +     use frame_support::sp_runtime::sp_application_crypto::RuntimePublic;

But its none existing path

Tried importing

 use sp_runtime::traits::Verify;


    use sp_runtime::RuntimeAppPublic;

separately, but there is no luck

Im getting the same error if I use use sp_core::ed25519

I have referred to this How to verify a signature in a Pallet? but it was not helpful in this scenario

How to call verify function to check the signature?

1 Answer 1


try importing sp_runtime::RuntimeAppPublic it has the verify method

  • Gets the same error .verify(&input.public_key, &generated_signature_from_bytes) | | -^^^^^^ method cannot be called on Public due to unsatisfied trait bounds
    – Kalanamith
    Commented Sep 10, 2023 at 7:33
  • @not0x12 try adding also use sp_runtime::app_crypto::RuntimePublic; this should work
    – dadzerlaze
    Commented Sep 11, 2023 at 8:14

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