diff --git a/demo/runtime/src/lib.rs b/demo/runtime/src/lib.rs
index de70ad0997..53c6f9a9b5 100644
--- a/demo/runtime/src/lib.rs
+++ b/demo/runtime/src/lib.rs
@@ -47,10 +47,10 @@ use sp_core::{OpaqueMetadata, crypto::KeyTypeId};
 use sp_governed_map::MainChainScriptsV1;
 use sp_inherents::InherentIdentifier;
 use sp_runtime::{
-	ApplyExtrinsicResult, MultiSignature, Perbill, generic, impl_opaque_keys,
+	ApplyExtrinsicResult, MultiSignature, Perbill, SaturatedConversion, generic, impl_opaque_keys,
 	traits::{
 		AccountIdLookup, BlakeTwo256, Block as BlockT, IdentifyAccount, NumberFor, One, OpaqueKeys,
-		Verify,
+		StaticLookup, Verify,
 	},
 	transaction_validity::{TransactionSource, TransactionValidity},
 };
@@ -712,8 +712,9 @@ pub type Address = sp_runtime::MultiAddress<AccountId, ()>;
 pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
 /// Block type as expected by this runtime.
 pub type Block = generic::Block<Header, UncheckedExtrinsic>;
-/// The SignedExtension to the basic transaction logic.
-pub type SignedExtra = (
+/// The TransactionExtension to the basic transaction logic.
+pub type TxExtension = (
+	frame_system::AuthorizeCall<Runtime>,
 	frame_system::CheckNonZeroSender<Runtime>,
 	frame_system::CheckSpecVersion<Runtime>,
 	frame_system::CheckTxVersion<Runtime>,
@@ -722,13 +723,18 @@ pub type SignedExtra = (
 	frame_system::CheckNonce<Runtime>,
 	frame_system::CheckWeight<Runtime>,
 	pallet_transaction_payment::ChargeTransactionPayment<Runtime>,
+	frame_system::WeightReclaim<Runtime>,
 );
 
 /// Unchecked extrinsic type as expected by this runtime.
 pub type UncheckedExtrinsic =
-	generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, SignedExtra>;
+	generic::UncheckedExtrinsic<Address, RuntimeCall, Signature, TxExtension>;
+pub type UncheckedSignaturePayload =
+	generic::UncheckedSignaturePayload<Address, Signature, TxExtension>;
 /// The payload being signed in transactions.
-pub type SignedPayload = generic::SignedPayload<RuntimeCall, SignedExtra>;
+pub type SignedPayload = generic::SignedPayload<RuntimeCall, TxExtension>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, RuntimeCall, TxExtension>;
 pub type Migrations = (
 	pallet_session_validator_management::migrations::v1::LegacyToV1Migration<Runtime>,
 	// More migrations can be added here
@@ -743,6 +749,108 @@ pub type Executive = frame_executive::Executive<
 	Migrations,
 >;
 
+impl<LocalCall> frame_system::offchain::CreateTransaction<LocalCall> for Runtime
+where
+	RuntimeCall: From<LocalCall>,
+{
+	type Extension = TxExtension;
+
+	fn create_transaction(call: RuntimeCall, extension: TxExtension) -> UncheckedExtrinsic {
+		generic::UncheckedExtrinsic::new_transaction(call, extension).into()
+	}
+}
+
+impl<LocalCall> frame_system::offchain::CreateBare<LocalCall> for Runtime
+where
+	RuntimeCall: From<LocalCall>,
+{
+	fn create_bare(call: RuntimeCall) -> UncheckedExtrinsic {
+		generic::UncheckedExtrinsic::new_bare(call).into()
+	}
+}
+
+impl frame_system::offchain::SigningTypes for Runtime {
+	type Public = <Signature as sp_runtime::traits::Verify>::Signer;
+	type Signature = Signature;
+}
+
+impl<C> frame_system::offchain::CreateTransactionBase<C> for Runtime
+where
+	RuntimeCall: From<C>,
+{
+	type Extrinsic = UncheckedExtrinsic;
+	type RuntimeCall = RuntimeCall;
+}
+
+impl<C> frame_system::offchain::CreateAuthorizedTransaction<C> for Runtime
+where
+	RuntimeCall: From<C>,
+{
+	fn create_extension() -> Self::Extension {
+		(
+			frame_system::AuthorizeCall::<Runtime>::new(),
+			frame_system::CheckNonZeroSender::<Runtime>::new(),
+			frame_system::CheckSpecVersion::<Runtime>::new(),
+			frame_system::CheckTxVersion::<Runtime>::new(),
+			frame_system::CheckGenesis::<Runtime>::new(),
+			frame_system::CheckEra::<Runtime>::from(generic::Era::Immortal),
+			frame_system::CheckNonce::<Runtime>::from(0),
+			frame_system::CheckWeight::<Runtime>::new(),
+			pallet_transaction_payment::ChargeTransactionPayment::<Runtime>::from(0),
+			frame_system::WeightReclaim::<Runtime>::new(),
+		)
+	}
+}
+
+impl<LocalCall> frame_system::offchain::CreateSignedTransaction<LocalCall> for Runtime
+where
+	RuntimeCall: From<LocalCall>,
+{
+	fn create_signed_transaction<
+		C: frame_system::offchain::AppCrypto<Self::Public, Self::Signature>,
+	>(
+		call: RuntimeCall,
+		public: <Signature as sp_runtime::traits::Verify>::Signer,
+		account: AccountId,
+		nonce: Nonce,
+	) -> Option<UncheckedExtrinsic> {
+		// take the biggest period possible.
+		let period =
+			BlockHashCount::get().checked_next_power_of_two().map(|c| c / 2).unwrap_or(2) as u64;
+		let current_block = System::block_number()
+			.saturated_into::<u64>()
+			// The `System::block_number` is initialized with `n+1`,
+			// so the actual block number is `n`.
+			.saturating_sub(1);
+		let era = generic::Era::mortal(period, current_block);
+		let tip = 0;
+		let tx_ext: TxExtension = (
+			frame_system::AuthorizeCall::<Runtime>::new(),
+			frame_system::CheckNonZeroSender::<Runtime>::new(),
+			frame_system::CheckSpecVersion::<Runtime>::new(),
+			frame_system::CheckTxVersion::<Runtime>::new(),
+			frame_system::CheckGenesis::<Runtime>::new(),
+			frame_system::CheckEra::<Runtime>::from(era),
+			frame_system::CheckNonce::<Runtime>::from(nonce),
+			frame_system::CheckWeight::<Runtime>::new(),
+			pallet_transaction_payment::ChargeTransactionPayment::<Runtime>::from(tip),
+			frame_system::WeightReclaim::<Runtime>::new(),
+		);
+
+		let raw_payload = SignedPayload::new(call, tx_ext)
+			.map_err(|e| {
+				log::warn!("Unable to create signed payload: {:?}", e);
+			})
+			.ok()?;
+		let signature = raw_payload.using_encoded(|payload| C::sign(payload, public))?;
+		let address = <Runtime as frame_system::Config>::Lookup::unlookup(account);
+		let (call, tx_ext, _) = raw_payload.deconstruct();
+		let transaction =
+			generic::UncheckedExtrinsic::new_signed(call, address, signature, tx_ext).into();
+		Some(transaction)
+	}
+}
+
 #[cfg(feature = "runtime-benchmarks")]
 mod benches {
 	define_benchmarks!(