diff --git a/db/src/block_provider.rs b/db/src/block_provider.rs
index 73fc8b36..bd3d0140 100644
--- a/db/src/block_provider.rs
+++ b/db/src/block_provider.rs
@@ -33,8 +33,3 @@ pub trait BlockProvider: BlockHeaderProvider {
 	/// returns all transactions in the block by block reference (number/hash)
 	fn block_transactions(&self, block_ref: BlockRef) -> Vec<chain::Transaction>;
 }
-
-pub trait AsBlockHeaderProvider {
-	/// returns `BlockHeaderProvider`
-	fn as_block_header_provider(&self) -> &BlockHeaderProvider;
-}
diff --git a/db/src/lib.rs b/db/src/lib.rs
index 6d8ed2cb..eaf73d6a 100644
--- a/db/src/lib.rs
+++ b/db/src/lib.rs
@@ -67,13 +67,13 @@ impl BlockLocation {
 pub type SharedStore = std::sync::Arc<Store + Send + Sync>;
 
 pub use best_block::BestBlock;
-pub use storage::{Storage, Store};
+pub use storage::{Storage, Store, AsSubstore};
 pub use error::{Error, ConsistencyError};
 pub use kvdb::Database;
-pub use transaction_provider::{TransactionProvider, AsTransactionProvider, PreviousTransactionOutputProvider};
+pub use transaction_provider::{TransactionProvider, PreviousTransactionOutputProvider};
 pub use transaction_meta_provider::TransactionMetaProvider;
 pub use block_stapler::{BlockStapler, BlockInsertedChain};
-pub use block_provider::{BlockProvider, BlockHeaderProvider, AsBlockHeaderProvider};
+pub use block_provider::{BlockProvider, BlockHeaderProvider};
 pub use indexed_block::IndexedBlock;
 pub use indexed_header::IndexedBlockHeader;
 pub use indexed_transaction::IndexedTransaction;
diff --git a/db/src/storage.rs b/db/src/storage.rs
index d6efc175..377ca495 100644
--- a/db/src/storage.rs
+++ b/db/src/storage.rs
@@ -15,7 +15,7 @@ use lru_cache::LruCache;
 use transaction_meta::TransactionMeta;
 use error::{Error, ConsistencyError, MetaError};
 use update_context::UpdateContext;
-use block_provider::{BlockProvider, BlockHeaderProvider, AsBlockHeaderProvider};
+use block_provider::{BlockProvider, BlockHeaderProvider};
 use transaction_provider::TransactionProvider;
 use transaction_meta_provider::TransactionMetaProvider;
 use block_stapler::{BlockStapler, BlockInsertedChain, Reorganization};
@@ -43,7 +43,7 @@ const MAX_FORK_ROUTE_PRESET: usize = 2048;
 const TRANSACTION_CACHE_SIZE: usize = 524288;
 
 /// Blockchain storage interface
-pub trait Store : BlockProvider + BlockStapler + TransactionProvider + TransactionMetaProvider + AsBlockHeaderProvider {
+pub trait Store: AsSubstore {
 	/// get best block
 	fn best_block(&self) -> Option<BestBlock>;
 
@@ -51,6 +51,41 @@ pub trait Store : BlockProvider + BlockStapler + TransactionProvider + Transacti
 	fn best_header(&self) -> Option<chain::BlockHeader>;
 }
 
+/// Allows casting Arc<Store> to reference to any substore type
+pub trait AsSubstore: BlockProvider + BlockStapler + TransactionProvider + TransactionMetaProvider {
+	fn as_block_provider(&self) -> &BlockProvider;
+
+	fn as_block_header_provider(&self) -> &BlockHeaderProvider;
+
+	fn as_block_stapler(&self) -> &BlockStapler;
+
+	fn as_transaction_provider(&self) -> &TransactionProvider;
+
+	fn as_transaction_meta_provider(&self) -> &TransactionMetaProvider;
+}
+
+impl<T> AsSubstore for T where T: BlockProvider + BlockStapler + TransactionProvider + TransactionMetaProvider {
+	fn as_block_provider(&self) -> &BlockProvider {
+		&*self
+	}
+
+	fn as_block_header_provider(&self) -> &BlockHeaderProvider {
+		&*self
+	}
+
+	fn as_block_stapler(&self) -> &BlockStapler {
+		&*self
+	}
+
+	fn as_transaction_provider(&self) -> &TransactionProvider {
+		&*self
+	}
+
+	fn as_transaction_meta_provider(&self) -> &TransactionMetaProvider {
+		&*self
+	}
+}
+
 /// Blockchain storage with rocksdb database
 pub struct Storage {
 	database: Database,
@@ -432,12 +467,6 @@ impl BlockHeaderProvider for Storage {
 	}
 }
 
-impl AsBlockHeaderProvider for Storage {
-	fn as_block_header_provider(&self) -> &BlockHeaderProvider {
-		&*self
-	}
-}
-
 impl BlockProvider for Storage {
 	fn block_number(&self, hash: &H256) -> Option<u32> {
 		self.get(COL_BLOCK_NUMBERS, &**hash)
diff --git a/db/src/test_storage.rs b/db/src/test_storage.rs
index d95af684..b76e08ff 100644
--- a/db/src/test_storage.rs
+++ b/db/src/test_storage.rs
@@ -2,8 +2,8 @@
 
 use super::{
 	BlockRef, Store, Error, BestBlock, BlockLocation, BlockInsertedChain, BlockProvider,
-	BlockStapler, TransactionMetaProvider, TransactionProvider, AsTransactionProvider,
-	IndexedBlock, BlockHeaderProvider, AsBlockHeaderProvider,
+	BlockStapler, TransactionMetaProvider, TransactionProvider,
+	IndexedBlock, BlockHeaderProvider,
 };
 use chain::{self, Block};
 use primitives::hash::H256;
@@ -84,12 +84,6 @@ impl BlockHeaderProvider for TestStorage {
 	}
 }
 
-impl AsBlockHeaderProvider for TestStorage {
-	fn as_block_header_provider(&self) -> &BlockHeaderProvider {
-		&*self
-	}
-}
-
 impl BlockProvider for TestStorage {
 	fn block_number(&self, hash: &H256) -> Option<u32> {
 		let data = self.data.read();
@@ -192,12 +186,6 @@ impl TransactionProvider for TestStorage {
 	}
 }
 
-impl AsTransactionProvider for TestStorage {
-	fn as_transaction_provider(&self) -> &TransactionProvider {
-		&*self
-	}
-}
-
 impl TransactionMetaProvider for TestStorage {
 	// just spawns new meta so far, use real store for proper tests
 	fn transaction_meta(&self, hash: &H256) -> Option<TransactionMeta> {
diff --git a/db/src/transaction_provider.rs b/db/src/transaction_provider.rs
index 2d51269e..f7c60ef8 100644
--- a/db/src/transaction_provider.rs
+++ b/db/src/transaction_provider.rs
@@ -14,12 +14,6 @@ pub trait TransactionProvider {
 
 	/// resolves serialized transaction info by transaction hash
 	fn transaction(&self, hash: &H256) -> Option<chain::Transaction>;
-
-}
-
-pub trait AsTransactionProvider {
-	/// returns `TransactionProvider`
-	fn as_transaction_provider(&self) -> &TransactionProvider;
 }
 
 /// During transaction the only part of old transaction that we need is `TransactionOutput`.
diff --git a/miner/src/fee.rs b/miner/src/fee.rs
index c2045096..5a5c7e81 100644
--- a/miner/src/fee.rs
+++ b/miner/src/fee.rs
@@ -19,7 +19,7 @@ pub fn transaction_fee_rate(store: &TransactionProvider, transaction: &Transacti
 #[cfg(test)]
 mod tests {
 	use std::sync::Arc;
-	use db::{TestStorage, AsTransactionProvider};
+	use db::{TestStorage, AsSubstore};
 	use test_data;
 	use super::*;