diff --git a/primitives/application-crypto/src/lib.rs b/primitives/application-crypto/src/lib.rs
index 8bad474ede81e..b69b8b6877f79 100644
--- a/primitives/application-crypto/src/lib.rs
+++ b/primitives/application-crypto/src/lib.rs
@@ -25,7 +25,7 @@ pub use sp_core::{self, crypto::{CryptoType, CryptoTypePublicPair, Public, Deriv
 #[doc(hidden)]
 #[cfg(feature = "full_crypto")]
 pub use sp_core::crypto::{SecretStringError, DeriveJunction, Ss58Codec, Pair};
-pub use sp_core::crypto::{KeyTypeId, key_types};
+pub use sp_core::crypto::{KeyTypeId, CryptoTypeId, key_types};
 
 #[doc(hidden)]
 pub use codec;
@@ -55,7 +55,7 @@ pub use traits::*;
 macro_rules! app_crypto {
 	($module:ident, $key_type:expr) => {
 		$crate::app_crypto_public_full_crypto!($module::Public, $key_type);
-		$crate::app_crypto_public_common!($module::Public, $module::Signature, $key_type);
+		$crate::app_crypto_public_common!($module::Public, $module::Signature, $key_type, $module::CRYPTO_ID);
 		$crate::app_crypto_signature_full_crypto!($module::Signature, $key_type);
 		$crate::app_crypto_signature_common!($module::Signature, $key_type);
 		$crate::app_crypto_pair!($module::Pair, $key_type);
@@ -76,7 +76,7 @@ macro_rules! app_crypto {
 macro_rules! app_crypto {
 	($module:ident, $key_type:expr) => {
 		$crate::app_crypto_public_not_full_crypto!($module::Public, $key_type);
-		$crate::app_crypto_public_common!($module::Public, $module::Signature, $key_type);
+		$crate::app_crypto_public_common!($module::Public, $module::Signature, $key_type, $module::CRYPTO_ID);
 		$crate::app_crypto_signature_not_full_crypto!($module::Signature, $key_type);
 		$crate::app_crypto_signature_common!($module::Signature, $key_type);
 	};
@@ -246,7 +246,7 @@ macro_rules! app_crypto_public_not_full_crypto {
 #[doc(hidden)]
 #[macro_export]
 macro_rules! app_crypto_public_common {
-	($public:ty, $sig:ty, $key_type:expr) => {
+	($public:ty, $sig:ty, $key_type:expr, $crypto_type:expr) => {
 		$crate::app_crypto_public_common_if_std!();
 
 		impl AsRef<[u8]> for Public {
@@ -267,6 +267,8 @@ macro_rules! app_crypto_public_common {
 
 		impl $crate::RuntimeAppPublic for Public where $public: $crate::RuntimePublic<Signature=$sig> {
 			const ID: $crate::KeyTypeId = $key_type;
+			const CRYPTO_ID: $crate::CryptoTypeId = $crypto_type;
+
 			type Signature = Signature;
 
 			fn all() -> $crate::Vec<Self> {
diff --git a/primitives/application-crypto/src/traits.rs b/primitives/application-crypto/src/traits.rs
index 2af039a88df4c..2983b143df1ec 100644
--- a/primitives/application-crypto/src/traits.rs
+++ b/primitives/application-crypto/src/traits.rs
@@ -18,7 +18,7 @@
 use sp_core::crypto::Pair;
 
 use codec::Codec;
-use sp_core::crypto::{KeyTypeId, CryptoType, IsWrappedBy, Public};
+use sp_core::crypto::{KeyTypeId, CryptoType, CryptoTypeId, IsWrappedBy, Public};
 use sp_std::{fmt::Debug, vec::Vec};
 
 /// An application-specific key.
@@ -115,6 +115,8 @@ pub trait RuntimePublic: Sized {
 pub trait RuntimeAppPublic: Sized {
 	/// An identifier for this application-specific key type.
 	const ID: KeyTypeId;
+	/// The identifier of the crypto type of this application-specific key type.
+	const CRYPTO_ID: CryptoTypeId;
 
 	/// The signature that will be generated when signing with the corresponding private key.
 	type Signature: Codec + Debug + MaybeHash + Eq + PartialEq + Clone;
diff --git a/primitives/runtime/src/lib.rs b/primitives/runtime/src/lib.rs
index a5b3e71edcde3..b55edbd88d7f1 100644
--- a/primitives/runtime/src/lib.rs
+++ b/primitives/runtime/src/lib.rs
@@ -62,7 +62,7 @@ pub use crate::runtime_string::*;
 pub use generic::{DigestItem, Digest};
 
 /// Re-export this since it's part of the API of this crate.
-pub use sp_core::{TypeId, crypto::{key_types, KeyTypeId, CryptoType, AccountId32}};
+pub use sp_core::{TypeId, crypto::{key_types, KeyTypeId, CryptoType, CryptoTypeId, AccountId32}};
 pub use sp_application_crypto::{RuntimeAppPublic, BoundToRuntimeAppPublic};
 
 /// Re-export `RuntimeDebug`, to avoid dependency clutter.
diff --git a/primitives/runtime/src/testing.rs b/primitives/runtime/src/testing.rs
index 40b4e23e3fa0a..333f78f515106 100644
--- a/primitives/runtime/src/testing.rs
+++ b/primitives/runtime/src/testing.rs
@@ -24,7 +24,7 @@ use crate::traits::{
 	SignedExtension, Dispatchable, DispatchInfoOf,
 };
 use crate::traits::ValidateUnsigned;
-use crate::{generic, KeyTypeId, ApplyExtrinsicResult};
+use crate::{generic, KeyTypeId, CryptoTypeId, ApplyExtrinsicResult};
 pub use sp_core::{H256, sr25519};
 use sp_core::{crypto::{CryptoType, Dummy, key_types, Public}, U256};
 use crate::transaction_validity::{TransactionValidity, TransactionValidityError, TransactionSource};
@@ -86,6 +86,7 @@ impl UintAuthorityId {
 
 impl sp_application_crypto::RuntimeAppPublic for UintAuthorityId {
 	const ID: KeyTypeId = key_types::DUMMY;
+	const CRYPTO_ID: CryptoTypeId = CryptoTypeId(*b"dumm");
 
 	type Signature = TestSignature;