diff --git a/applications/tari_app_grpc/proto/base_node.proto b/applications/tari_app_grpc/proto/base_node.proto
index d5cb26a707..a9bbcaf999 100644
--- a/applications/tari_app_grpc/proto/base_node.proto
+++ b/applications/tari_app_grpc/proto/base_node.proto
@@ -91,7 +91,7 @@ service BaseNode {
     // Get VNs
     rpc GetActiveValidatorNodes(GetActiveValidatorNodesRequest) returns (stream ActiveValidatorNode);
     rpc GetCommittee(GetCommitteeRequest) returns (GetCommitteeResponse);
-
+    rpc GetShardKey(GetShardKeyRequest) returns (GetShardKeyResponse);
 }
 
 message GetAssetMetadataRequest {
@@ -455,4 +455,13 @@ message GetCommitteeRequest {
 
 message GetCommitteeResponse {
     repeated bytes public_key = 1;
+}
+
+message GetShardKeyRequest {
+    uint64 height = 1;
+    bytes public_key = 2;
+}
+
+message GetShardKeyResponse {
+    bytes shard_key = 1;
 }
\ No newline at end of file
diff --git a/applications/tari_base_node/src/grpc/base_node_grpc_server.rs b/applications/tari_base_node/src/grpc/base_node_grpc_server.rs
index a7b70eb5bc..d10aea2bd2 100644
--- a/applications/tari_base_node/src/grpc/base_node_grpc_server.rs
+++ b/applications/tari_base_node/src/grpc/base_node_grpc_server.rs
@@ -33,7 +33,7 @@ use tari_app_grpc::{
     tari_rpc::{CalcType, Sorting},
 };
 use tari_app_utilities::consts;
-use tari_common_types::types::{Commitment, Signature};
+use tari_common_types::types::{Commitment, PublicKey, Signature};
 use tari_comms::{Bytes, CommsNode};
 use tari_core::{
     base_node::{
@@ -1599,6 +1599,24 @@ impl tari_rpc::base_node_server::BaseNode for BaseNodeGrpcServer {
         Ok(Response::new(tari_rpc::GetCommitteeResponse { public_key: response }))
     }
 
+    async fn get_shard_key(
+        &self,
+        request: Request<tari_rpc::GetShardKeyRequest>,
+    ) -> Result<Response<tari_rpc::GetShardKeyResponse>, Status> {
+        let request = request.into_inner();
+        let report_error_flag = self.report_error_flag();
+        let mut handler = self.node_service.clone();
+        let public_key = PublicKey::from_bytes(&request.public_key)
+            .map_err(|e| report_error(report_error_flag, Status::invalid_argument(e.to_string())))?;
+        let shard_key = handler.get_shard_key(request.height, public_key).await.map_err(|e| {
+            error!(target: LOG_TARGET, "Error {}", e);
+            report_error(report_error_flag, Status::internal(e.to_string()))
+        })?;
+        Ok(Response::new(tari_rpc::GetShardKeyResponse {
+            shard_key: shard_key.to_vec(),
+        }))
+    }
+
     async fn get_active_validator_nodes(
         &self,
         request: Request<tari_rpc::GetActiveValidatorNodesRequest>,
diff --git a/base_layer/core/src/base_node/comms_interface/comms_request.rs b/base_layer/core/src/base_node/comms_interface/comms_request.rs
index 9c77b2bf1f..817438bc05 100644
--- a/base_layer/core/src/base_node/comms_interface/comms_request.rs
+++ b/base_layer/core/src/base_node/comms_interface/comms_request.rs
@@ -26,7 +26,7 @@ use std::{
 };
 
 use serde::{Deserialize, Serialize};
-use tari_common_types::types::{Commitment, HashOutput, PrivateKey, Signature};
+use tari_common_types::types::{Commitment, HashOutput, PrivateKey, PublicKey, Signature};
 use tari_utilities::hex::Hex;
 
 use crate::{blocks::NewBlockTemplate, chain_storage::MmrTree, proof_of_work::PowAlgorithm};
@@ -58,6 +58,7 @@ pub enum NodeCommsRequest {
     FetchMempoolTransactionsByExcessSigs { excess_sigs: Vec<PrivateKey> },
     FetchValidatorNodesKeys { height: u64 },
     FetchCommittee { height: u64, shard: [u8; 32] },
+    GetShardKey { height: u64, public_key: PublicKey },
 }
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -102,6 +103,9 @@ impl Display for NodeCommsRequest {
             FetchCommittee { height, shard } => {
                 write!(f, "FetchCommittee height ({}), shard({:?})", height, shard)
             },
+            GetShardKey { height, public_key } => {
+                write!(f, "GetShardKey height ({}), public key ({:?})", height, public_key)
+            },
         }
     }
 }
diff --git a/base_layer/core/src/base_node/comms_interface/comms_response.rs b/base_layer/core/src/base_node/comms_interface/comms_response.rs
index 9dde44f55c..6298ba8cc7 100644
--- a/base_layer/core/src/base_node/comms_interface/comms_response.rs
+++ b/base_layer/core/src/base_node/comms_interface/comms_response.rs
@@ -73,6 +73,7 @@ pub enum NodeCommsResponse {
     },
     FetchValidatorNodesKeysResponse(Vec<ActiveValidatorNode>),
     FetchCommitteeResponse(Vec<ActiveValidatorNode>),
+    GetShardKeyResponse([u8; 32]),
 }
 
 impl Display for NodeCommsResponse {
@@ -113,6 +114,7 @@ impl Display for NodeCommsResponse {
             FetchOutputsByContractIdResponse { .. } => write!(f, "FetchOutputsByContractIdResponse"),
             FetchValidatorNodesKeysResponse(_) => write!(f, "FetchValidatorNodesKeysResponse"),
             FetchCommitteeResponse(_) => write!(f, "FetchCommitteeResponse"),
+            GetShardKeyResponse(_) => write!(f, "GetShardKeyResponse"),
         }
     }
 }
diff --git a/base_layer/core/src/base_node/comms_interface/inbound_handlers.rs b/base_layer/core/src/base_node/comms_interface/inbound_handlers.rs
index c5419cc62e..ce6e4f221c 100644
--- a/base_layer/core/src/base_node/comms_interface/inbound_handlers.rs
+++ b/base_layer/core/src/base_node/comms_interface/inbound_handlers.rs
@@ -373,6 +373,10 @@ where B: BlockchainBackend + 'static
                 let validator_nodes = self.blockchain_db.fetch_committee(height, shard).await?;
                 Ok(NodeCommsResponse::FetchCommitteeResponse(validator_nodes))
             },
+            NodeCommsRequest::GetShardKey { height, public_key } => {
+                let shard_key = self.blockchain_db.get_shard_key(height, public_key).await?;
+                Ok(NodeCommsResponse::GetShardKeyResponse(shard_key))
+            },
         }
     }
 
diff --git a/base_layer/core/src/base_node/comms_interface/local_interface.rs b/base_layer/core/src/base_node/comms_interface/local_interface.rs
index b51373f218..be699e725d 100644
--- a/base_layer/core/src/base_node/comms_interface/local_interface.rs
+++ b/base_layer/core/src/base_node/comms_interface/local_interface.rs
@@ -24,7 +24,7 @@ use std::{ops::RangeInclusive, sync::Arc};
 
 use tari_common_types::{
     chain_metadata::ChainMetadata,
-    types::{BlockHash, Commitment, HashOutput, Signature},
+    types::{BlockHash, Commitment, HashOutput, PublicKey, Signature},
 };
 use tari_service_framework::{reply_channel::SenderService, Service};
 use tokio::sync::broadcast;
@@ -301,4 +301,15 @@ impl LocalNodeCommsInterface {
             _ => Err(CommsInterfaceError::UnexpectedApiResponse),
         }
     }
+
+    pub async fn get_shard_key(&mut self, height: u64, public_key: PublicKey) -> Result<[u8; 32], CommsInterfaceError> {
+        match self
+            .request_sender
+            .call(NodeCommsRequest::GetShardKey { height, public_key })
+            .await??
+        {
+            NodeCommsResponse::GetShardKeyResponse(shard_key) => Ok(shard_key),
+            _ => Err(CommsInterfaceError::UnexpectedApiResponse),
+        }
+    }
 }
diff --git a/base_layer/core/src/chain_storage/async_db.rs b/base_layer/core/src/chain_storage/async_db.rs
index 42940705f5..7e03494073 100644
--- a/base_layer/core/src/chain_storage/async_db.rs
+++ b/base_layer/core/src/chain_storage/async_db.rs
@@ -26,7 +26,7 @@ use log::*;
 use rand::{rngs::OsRng, RngCore};
 use tari_common_types::{
     chain_metadata::ChainMetadata,
-    types::{BlockHash, Commitment, HashOutput, Signature},
+    types::{BlockHash, Commitment, HashOutput, PublicKey, Signature},
 };
 use tari_utilities::epoch_time::EpochTime;
 
@@ -271,6 +271,8 @@ impl<B: BlockchainBackend + 'static> AsyncBlockchainDb<B> {
     make_async_fn!(fetch_committee(height: u64, shard: [u8;32]) -> Vec<ActiveValidatorNode>, "fetch_committee");
 
     make_async_fn!(get_validator_nodes_mr() -> Vec<u8>, "get_validator_nodes_mr");
+
+    make_async_fn!(get_shard_key(height:u64, public_key:PublicKey) -> [u8;32], "get_shard_key");
 }
 
 impl<B: BlockchainBackend + 'static> From<BlockchainDatabase<B>> for AsyncBlockchainDb<B> {
diff --git a/base_layer/core/src/chain_storage/blockchain_backend.rs b/base_layer/core/src/chain_storage/blockchain_backend.rs
index 08478a13a3..c7f0d72626 100644
--- a/base_layer/core/src/chain_storage/blockchain_backend.rs
+++ b/base_layer/core/src/chain_storage/blockchain_backend.rs
@@ -4,7 +4,7 @@
 use croaring::Bitmap;
 use tari_common_types::{
     chain_metadata::ChainMetadata,
-    types::{Commitment, HashOutput, Signature},
+    types::{Commitment, HashOutput, PublicKey, Signature},
 };
 
 use super::ActiveValidatorNode;
@@ -195,4 +195,5 @@ pub trait BlockchainBackend: Send + Sync {
 
     fn fetch_active_validator_nodes(&self, height: u64) -> Result<Vec<ActiveValidatorNode>, ChainStorageError>;
     fn fetch_committee(&self, height: u64, shard: [u8; 32]) -> Result<Vec<ActiveValidatorNode>, ChainStorageError>;
+    fn get_shard_key(&self, height: u64, public_key: PublicKey) -> Result<[u8; 32], ChainStorageError>;
 }
diff --git a/base_layer/core/src/chain_storage/blockchain_database.rs b/base_layer/core/src/chain_storage/blockchain_database.rs
index b32a21976b..4dc5195e36 100644
--- a/base_layer/core/src/chain_storage/blockchain_database.rs
+++ b/base_layer/core/src/chain_storage/blockchain_database.rs
@@ -36,7 +36,7 @@ use log::*;
 use serde::{Deserialize, Serialize};
 use tari_common_types::{
     chain_metadata::ChainMetadata,
-    types::{BlockHash, Commitment, FixedHash, HashOutput, Signature},
+    types::{BlockHash, Commitment, FixedHash, HashOutput, PublicKey, Signature},
 };
 use tari_mmr::pruned_hashset::PrunedHashSet;
 use tari_utilities::{epoch_time::EpochTime, hex::Hex, ByteArray};
@@ -848,6 +848,11 @@ where B: BlockchainBackend
         Ok(mmr.get_merkle_root().unwrap())
     }
 
+    pub fn get_shard_key(&self, height: u64, public_key: PublicKey) -> Result<[u8; 32], ChainStorageError> {
+        let db = self.db_read_access()?;
+        db.get_shard_key(height, public_key)
+    }
+
     /// Tries to add a block to the longest chain.
     ///
     /// The block is added to the longest chain if and only if
diff --git a/base_layer/core/src/chain_storage/lmdb_db/lmdb_db.rs b/base_layer/core/src/chain_storage/lmdb_db/lmdb_db.rs
index 6cf12d69bd..d3a448a6f7 100644
--- a/base_layer/core/src/chain_storage/lmdb_db/lmdb_db.rs
+++ b/base_layer/core/src/chain_storage/lmdb_db/lmdb_db.rs
@@ -182,7 +182,7 @@ pub fn create_lmdb_database<P: AsRef<Path>>(
         .add_database(LMDB_DB_ORPHAN_PARENT_MAP_INDEX, flags | db::DUPSORT)
         .add_database(LMDB_DB_BAD_BLOCK_LIST, flags)
         .add_database(LMDB_DB_REORGS, flags | db::INTEGERKEY)
-        .add_database(LMDB_DB_VALIDATOR_NODES, flags)
+        .add_database(LMDB_DB_VALIDATOR_NODES, flags | db::DUPSORT)
         .add_database(LMDB_DB_VALIDATOR_NODES_MAPPING, flags | db::DUPSORT)
         .build()
         .map_err(|err| ChainStorageError::CriticalError(format!("Could not create LMDB store:{}", err)))?;
@@ -2471,6 +2471,21 @@ impl BlockchainBackend for LMDBDatabase {
         }
         Ok(result)
     }
+
+    fn get_shard_key(&self, height: u64, public_key: PublicKey) -> Result<[u8; 32], ChainStorageError> {
+        let txn = self.read_transaction()?;
+        let validator_nodes: Vec<ActiveValidatorNode> =
+            lmdb_get_multiple(&txn, &self.validator_nodes, public_key.as_bytes())?;
+        validator_nodes
+            .iter()
+            .find(|a| a.from_height <= height && height <= a.to_height)
+            .map(|a| a.shard_key)
+            .ok_or(ChainStorageError::ValueNotFound {
+                entity: "ShardKey",
+                field: "public_key",
+                value: public_key.to_hex(),
+            })
+    }
 }
 
 // Fetch the chain metadata
diff --git a/base_layer/core/src/lib.rs b/base_layer/core/src/lib.rs
index 0deca2dcef..a00af389af 100644
--- a/base_layer/core/src/lib.rs
+++ b/base_layer/core/src/lib.rs
@@ -108,6 +108,14 @@ mod domain_hashing {
     );
     pub type InputMmrHasherBlake256 = DomainSeparatedHasher<Blake256, InputMmrHashDomain>;
     pub type PrunedInputMmr = MerkleMountainRange<InputMmrHasherBlake256, PrunedHashSet>;
+}
+
+#[cfg(feature = "base_node")]
+pub use domain_hashing::*;
+
+mod validator_domain_hashing {
+    use tari_crypto::{hash::blake2::Blake256, hash_domain, hashing::DomainSeparatedHasher};
+    use tari_mmr::{Hash, MerkleMountainRange};
 
     hash_domain!(
         ValidatorNodeMmrHashDomain,
@@ -117,5 +125,5 @@ mod domain_hashing {
     pub type ValidatorNodeMmrHasherBlake256 = DomainSeparatedHasher<Blake256, ValidatorNodeMmrHashDomain>;
     pub type ValidatorNodeMmr = MerkleMountainRange<ValidatorNodeMmrHasherBlake256, Vec<Hash>>;
 }
-#[cfg(feature = "base_node")]
-pub use domain_hashing::*;
+
+pub use validator_domain_hashing::*;
diff --git a/base_layer/core/src/test_helpers/blockchain.rs b/base_layer/core/src/test_helpers/blockchain.rs
index 92579237d4..c37c03cd05 100644
--- a/base_layer/core/src/test_helpers/blockchain.rs
+++ b/base_layer/core/src/test_helpers/blockchain.rs
@@ -32,7 +32,7 @@ use croaring::Bitmap;
 use tari_common::configuration::Network;
 use tari_common_types::{
     chain_metadata::ChainMetadata,
-    types::{Commitment, HashOutput, Signature},
+    types::{Commitment, HashOutput, PublicKey, Signature},
 };
 use tari_storage::lmdb_store::LMDBConfig;
 use tari_test_utils::paths::create_temporary_data_path;
@@ -424,6 +424,10 @@ impl BlockchainBackend for TempDatabase {
     fn fetch_committee(&self, height: u64, shard: [u8; 32]) -> Result<Vec<ActiveValidatorNode>, ChainStorageError> {
         self.db.as_ref().unwrap().fetch_committee(height, shard)
     }
+
+    fn get_shard_key(&self, height: u64, public_key: PublicKey) -> Result<[u8; 32], ChainStorageError> {
+        self.db.as_ref().unwrap().get_shard_key(height, public_key)
+    }
 }
 
 pub fn create_chained_blocks<T: Into<BlockSpecs>>(