diff --git a/runtime/common/src/parachains.rs b/runtime/common/src/parachains.rs
index 33f197863970..d593b04d3b49 100644
--- a/runtime/common/src/parachains.rs
+++ b/runtime/common/src/parachains.rs
@@ -19,7 +19,7 @@
 use sp_std::prelude::*;
 use sp_std::result;
 use codec::{Decode, Encode};
-
+use sp_core::sr25519;
 use sp_runtime::{
 	KeyTypeId, Perbill, RuntimeDebug,
 	traits::{
@@ -41,19 +41,23 @@ use frame_support::{
 use primitives::{
 	Balance,
 	BlockNumber,
+	Signature,
 	parachain::{
 		Id as ParaId, Chain, DutyRoster, AttestedCandidate, Statement, ParachainDispatchOrigin,
 		UpwardMessage, ValidatorId, ActiveParas, CollatorId, Retriable, OmittedValidationData,
 		CandidateReceipt, GlobalValidationSchedule, AbridgedCandidateReceipt,
 		LocalValidationData, Scheduling, ValidityAttestation, NEW_HEADS_IDENTIFIER, PARACHAIN_KEY_TYPE_ID,
-		ValidatorSignature, SigningContext, HeadData, ValidationCode,
+		ValidatorSignature, SigningContext, HeadData, ValidationCode, FishermanId,
 	},
 };
 use frame_support::{
 	Parameter, dispatch::DispatchResult, decl_storage, decl_module, decl_error, ensure,
 	traits::{Currency, Get, WithdrawReason, ExistenceRequirement, Randomness},
 };
-use sp_runtime::transaction_validity::InvalidTransaction;
+use sp_runtime::{
+	transaction_validity::InvalidTransaction,
+	traits::Verify,
+};
 
 use inherents::{ProvideInherent, InherentData, MakeFatalError, InherentIdentifier};
 
@@ -64,23 +68,12 @@ use system::{
 use crate::attestations::{self, IncludedBlocks};
 use crate::registrar::Registrar;
 
-pub const KEY_TYPE: KeyTypeId = KeyTypeId(*b"para");
-
-pub mod crypto {
-	use super::KEY_TYPE;
-	use sp_runtime::{
-		app_crypto::{app_crypto, sr25519},
-		traits::Verify,
-	};
-	use sp_core::sr25519::Signature as Sr25519Signature;
-	app_crypto!(sr25519, KEY_TYPE);
-
-	pub struct AuthorityId;
-	impl system::offchain::AppCrypto<<Sr25519Signature as Verify>::Signer, Sr25519Signature> for AuthorityId {
-		type RuntimeAppPublic = Public;
-		type GenericSignature = Sr25519Signature;
-		type GenericPublic = sp_core::sr25519::Public;
-	}
+// An `AppCrypto` type to facilitate submitting signed transactions.
+pub struct FishermanAuthorityId;
+impl system::offchain::AppCrypto<<Signature as Verify>::Signer, Signature> for FishermanAuthorityId {
+	type RuntimeAppPublic = FishermanId;
+	type GenericSignature = sr25519::Signature;
+	type GenericPublic = sp_core::sr25519::Public;
 }
 
 // ranges for iteration of general block number don't work, so this
@@ -818,8 +811,9 @@ impl<T: Trait> Module<T> {
 				move |_account| {
 					Call::report_double_vote(report.clone())
 				}
-			);
-		return Some(())
+			)
+			.iter()
+			.find_map(|(_, res)| res.ok().map(|_| ()))
 	}
 
 	/// Dispatch some messages from a parachain.
diff --git a/runtime/kusama/src/lib.rs b/runtime/kusama/src/lib.rs
index ab8e0b6c76ba..7b19200dcefc 100644
--- a/runtime/kusama/src/lib.rs
+++ b/runtime/kusama/src/lib.rs
@@ -32,7 +32,6 @@ use runtime_common::{attestations, claims, parachains, registrar, slots,
 	NegativeImbalance, BlockHashCount, MaximumBlockWeight, AvailableBlockRatio,
 	MaximumBlockLength,
 };
-use sp_core::sr25519;
 use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	ApplyExtrinsicResult, KeyTypeId, Percent, Permill, Perbill, Perquintill, RuntimeDebug,
@@ -517,7 +516,7 @@ parameter_types! {
 }
 
 impl parachains::Trait for Runtime {
-	type AuthorityId = FishermanAuthorityId;
+	type AuthorityId = parachains::FishermanAuthorityId;
 	type Origin = Origin;
 	type Call = Call;
 	type ParachainCurrency = Balances;
@@ -539,13 +538,6 @@ impl parachains::Trait for Runtime {
 	type BlockHashConversion = sp_runtime::traits::Identity;
 }
 
-pub struct FishermanAuthorityId;
-impl system::offchain::AppCrypto<<Signature as Verify>::Signer, Signature> for FishermanAuthorityId {
-	type RuntimeAppPublic = parachain::FishermanId;
-	type GenericSignature = sr25519::Signature;
-	type GenericPublic = sr25519::Public;
-}
-
 impl<LocalCall> system::offchain::CreateSignedTransaction<LocalCall> for Runtime where
 	Call: From<LocalCall>,
 {
diff --git a/runtime/polkadot/src/lib.rs b/runtime/polkadot/src/lib.rs
index a37aa9418ea4..89d949d3ec1c 100644
--- a/runtime/polkadot/src/lib.rs
+++ b/runtime/polkadot/src/lib.rs
@@ -33,7 +33,6 @@ use primitives::{
 	AccountId, AccountIndex, Balance, BlockNumber, Hash, Nonce, Signature, Moment,
 	parachain::{self, ActiveParas, AbridgedCandidateReceipt, SigningContext}, ValidityError,
 };
-use sp_core::sr25519;
 use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	ApplyExtrinsicResult, KeyTypeId, Percent, Permill, Perbill, Perquintill, RuntimeDebug,
@@ -524,7 +523,7 @@ parameter_types! {
 }
 
 impl parachains::Trait for Runtime {
-	type AuthorityId = FishermanAuthorityId;
+	type AuthorityId = parachains::FishermanAuthorityId;
 	type Origin = Origin;
 	type Call = Call;
 	type ParachainCurrency = Balances;
@@ -546,13 +545,6 @@ impl parachains::Trait for Runtime {
 	type BlockHashConversion = sp_runtime::traits::Identity;
 }
 
-pub struct FishermanAuthorityId;
-impl system::offchain::AppCrypto<<Signature as Verify>::Signer, Signature> for FishermanAuthorityId {
-	type RuntimeAppPublic = parachain::FishermanId;
-	type GenericSignature = sr25519::Signature;
-	type GenericPublic = sr25519::Public;
-}
-
 impl<LocalCall> system::offchain::CreateSignedTransaction<LocalCall> for Runtime where
 	Call: From<LocalCall>,
 {
diff --git a/runtime/westend/src/lib.rs b/runtime/westend/src/lib.rs
index 94738af9e4c2..9d9df30385ba 100644
--- a/runtime/westend/src/lib.rs
+++ b/runtime/westend/src/lib.rs
@@ -30,7 +30,6 @@ use runtime_common::{attestations, parachains, registrar,
 	impls::{CurrencyToVoteHandler, TargetedFeeAdjustment, ToAuthor},
 	BlockHashCount, MaximumBlockWeight, AvailableBlockRatio, MaximumBlockLength,
 };
-use sp_core::sr25519;
 use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	ApplyExtrinsicResult, KeyTypeId, Perbill, Perquintill, RuntimeDebug,
@@ -387,7 +386,7 @@ parameter_types! {
 }
 
 impl parachains::Trait for Runtime {
-	type AuthorityId = FishermanAuthorityId;
+	type AuthorityId = parachains::FishermanAuthorityId;
 	type Origin = Origin;
 	type Call = Call;
 	type ParachainCurrency = Balances;
@@ -409,13 +408,6 @@ impl parachains::Trait for Runtime {
 	type BlockHashConversion = sp_runtime::traits::Identity;
 }
 
-pub struct FishermanAuthorityId;
-impl system::offchain::AppCrypto<<Signature as Verify>::Signer, Signature> for FishermanAuthorityId {
-	type RuntimeAppPublic = parachain::FishermanId;
-	type GenericSignature = sr25519::Signature;
-	type GenericPublic = sr25519::Public;
-}
-
 impl<LocalCall> system::offchain::CreateSignedTransaction<LocalCall> for Runtime where
 	Call: From<LocalCall>,
 {