feat: Rebrand Polkadot/Substrate references to PezkuwiChain

This commit systematically rebrands various references from Parity Technologies'
Polkadot/Substrate ecosystem to PezkuwiChain within the kurdistan-sdk.

Key changes include:
- Updated external repository URLs (zombienet-sdk, parity-db, parity-scale-codec, wasm-instrument) to point to pezkuwichain forks.
- Modified internal documentation and code comments to reflect PezkuwiChain naming and structure.
- Replaced direct references to  with  or specific paths within the  for XCM, Pezkuwi, and other modules.
- Cleaned up deprecated  issue and PR references in various  and  files, particularly in  and  modules.
- Adjusted image and logo URLs in documentation to point to PezkuwiChain assets.
- Removed or rephrased comments related to external Polkadot/Substrate PRs and issues.

This is a significant step towards fully customizing the SDK for the PezkuwiChain ecosystem.

bizinikiwi/pezframe/verify-signature/src/extension.rs

@@ -0,0 +1,158 @@
+// This file is part of Bizinikiwi.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Transaction extension which validates a signature against a payload constructed from a call and
+//! the rest of the transaction extension pipeline.
+
+use crate::{Config, WeightInfo};
+use codec::{Decode, DecodeWithMemTracking, Encode};
+use pezframe_support::{pezpallet_prelude::TransactionSource, traits::OriginTrait};
+use scale_info::TypeInfo;
+use pezsp_io::hashing::blake2_256;
+use pezsp_runtime::{
+	impl_tx_ext_default,
+	traits::{
+		transaction_extension::TransactionExtension, AsTransactionAuthorizedOrigin, DispatchInfoOf,
+		Dispatchable, Verify,
+	},
+	transaction_validity::{InvalidTransaction, TransactionValidityError, ValidTransaction},
+};
+use pezsp_weights::Weight;
+
+/// Extension that, if enabled, validates a signature type against the payload constructed from the
+/// call and the rest of the transaction extension pipeline. This extension provides the
+/// functionality that traditionally signed transactions had with the implicit signature checking
+/// implemented in [`Checkable`](pezsp_runtime::traits::Checkable). It is meant to be placed ahead of
+/// any other extensions that do authorization work in the [`TransactionExtension`] pipeline.
+#[derive(Encode, Decode, DecodeWithMemTracking, Clone, Eq, PartialEq, TypeInfo)]
+#[scale_info(skip_type_params(T))]
+pub enum VerifySignature<T>
+where
+	T: Config + Send + Sync,
+{
+	/// The extension will verify the signature and, if successful, authorize a traditionally
+	/// signed transaction.
+	Signed {
+		/// The signature provided by the transaction submitter.
+		signature: T::Signature,
+		/// The account that signed the payload.
+		account: T::AccountId,
+	},
+	/// The extension is disabled and will be passthrough.
+	Disabled,
+}
+
+impl<T> core::fmt::Debug for VerifySignature<T>
+where
+	T: Config + Send + Sync,
+{
+	#[cfg(feature = "std")]
+	fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+		write!(f, "VerifySignature")
+	}
+
+	#[cfg(not(feature = "std"))]
+	fn fmt(&self, _: &mut core::fmt::Formatter) -> core::fmt::Result {
+		Ok(())
+	}
+}
+
+impl<T> VerifySignature<T>
+where
+	T: Config + Send + Sync,
+{
+	/// Create a new extension instance that will validate the provided signature.
+	pub fn new_with_signature(signature: T::Signature, account: T::AccountId) -> Self {
+		Self::Signed { signature, account }
+	}
+
+	/// Create a new passthrough extension instance.
+	pub fn new_disabled() -> Self {
+		Self::Disabled
+	}
+}
+
+impl<T> TransactionExtension<T::RuntimeCall> for VerifySignature<T>
+where
+	T: Config + Send + Sync,
+	<T::RuntimeCall as Dispatchable>::RuntimeOrigin: AsTransactionAuthorizedOrigin,
+{
+	const IDENTIFIER: &'static str = "VerifyMultiSignature";
+	type Implicit = ();
+	type Val = ();
+	type Pre = ();
+
+	fn weight(&self, _call: &T::RuntimeCall) -> Weight {
+		match &self {
+			// The benchmarked weight of the payload construction and signature checking.
+			Self::Signed { .. } => T::WeightInfo::verify_signature(),
+			// When the extension is passthrough, it consumes no weight.
+			Self::Disabled => Weight::zero(),
+		}
+	}
+
+	fn validate(
+		&self,
+		mut origin: <T::RuntimeCall as Dispatchable>::RuntimeOrigin,
+		_call: &T::RuntimeCall,
+		_info: &DispatchInfoOf<T::RuntimeCall>,
+		_len: usize,
+		_: (),
+		inherited_implication: &impl Encode,
+		_source: TransactionSource,
+	) -> Result<
+		(ValidTransaction, Self::Val, <T::RuntimeCall as Dispatchable>::RuntimeOrigin),
+		TransactionValidityError,
+	> {
+		// If the extension is disabled, return early.
+		let (signature, account) = match &self {
+			Self::Signed { signature, account } => (signature, account),
+			Self::Disabled => return Ok((Default::default(), (), origin)),
+		};
+
+		// This extension must receive an unauthorized origin as it is meant to headline the
+		// authorization extension pipeline. Any extensions that precede this one must not authorize
+		// any origin and serve some other functional purpose.
+		if origin.is_transaction_authorized() {
+			return Err(InvalidTransaction::BadSigner.into());
+		}
+
+		// Construct the payload that the signature will be validated against. The inherited
+		// implication contains the encoded bytes of the call and all of the extension data of the
+		// extensions that follow in the `TransactionExtension` pipeline.
+		//
+		// In other words:
+		// - extensions that precede this extension are ignored in terms of signature validation;
+		// - extensions that follow this extension are included in the payload to be signed (as if
+		//   they were the entire `SignedExtension` pipeline in the traditional signed transaction
+		//   model).
+		//
+		// The encoded bytes of the payload are then hashed using `blake2_256`.
+		let msg = inherited_implication.using_encoded(blake2_256);
+
+		// The extension was enabled, so the signature must match.
+		if !signature.verify(&msg[..], account) {
+			Err(InvalidTransaction::BadProof)?
+		}
+
+		// Return the signer as the transaction origin.
+		origin.set_caller_from_signed(account.clone());
+		Ok((ValidTransaction::default(), (), origin))
+	}
+
+	impl_tx_ext_default!(T::RuntimeCall; prepare);
+}