diff --git a/db/src/storage.rs b/db/src/storage.rs
index cd5fe36c..9d4d23b1 100644
--- a/db/src/storage.rs
+++ b/db/src/storage.rs
@@ -25,7 +25,7 @@ const _COL_RESERVED6: u32 = 10;
 const DB_VERSION: u32 = 1;
 
 /// Blockchain storage interface
-pub trait Store {
+pub trait Store : Send + Sync {
 	/// resolves hash by block number
 	fn block_hash(&self, number: u64) -> Option<H256>;
 
diff --git a/verification/src/chain_verifier.rs b/verification/src/chain_verifier.rs
new file mode 100644
index 00000000..77dba1f8
--- /dev/null
+++ b/verification/src/chain_verifier.rs
@@ -0,0 +1,17 @@
+//! Bitcoin chain verifier
+
+use std::sync::Arc;
+
+use db;
+use chain;
+use super::{Verify, VerificationResult, Chain};
+
+struct ChainVerifier {
+	store: Arc<db::Store>,
+}
+
+impl Verify for ChainVerifier {
+	fn verify(&self, block: &chain::Block) -> VerificationResult {
+		Ok(Chain::Main)
+	}
+}
diff --git a/verification/src/lib.rs b/verification/src/lib.rs
index 37e188b7..1069f1eb 100644
--- a/verification/src/lib.rs
+++ b/verification/src/lib.rs
@@ -13,6 +13,7 @@ extern crate ethcore_devtools as devtools;
 extern crate test_data;
 
 mod queue;
+mod chain_verifier;
 
 pub use queue::Queue;