diff --git a/test-data/src/block.rs b/test-data/src/block.rs
index 4facedca..e7fa5d64 100644
--- a/test-data/src/block.rs
+++ b/test-data/src/block.rs
@@ -352,6 +352,7 @@ impl<F> TransactionInputBuilder<F> where F: Invoke<chain::TransactionInput> {
 
 	pub fn coinbase(mut self) -> Self {
 		self.output = Some(chain::OutPoint { hash: H256::from(0), index: 0xffffffff });
+		self.signature = vec![0u8; 2].into();
 		self
 	}
 
diff --git a/verification/src/chain_verifier.rs b/verification/src/chain_verifier.rs
index d6f3cad7..9487dbca 100644
--- a/verification/src/chain_verifier.rs
+++ b/verification/src/chain_verifier.rs
@@ -172,6 +172,15 @@ impl Verify for ChainVerifier {
 		if !block.transactions()[0].is_coinbase() {
 			return Err(Error::Coinbase)
 		}
+		else {
+			// check that coinbase does not have a signature
+			let coinbase = &block.transactions()[0];
+			// is_coinbase() = true above guarantees that there is at least one input
+			let coinbase_script_len = coinbase.inputs[0].script_sig().len();
+			if coinbase_script_len < 2 || coinbase_script_len > 100 {
+				return Err(Error::CoinbaseSignatureLength(coinbase_script_len));
+			}
+		}
 
 		// verify transactions (except coinbase)
 		let mut block_sigops = try!(
@@ -261,6 +270,9 @@ mod tests {
 	fn verify_smoky() {
 		let storage = TestStorage::with_blocks(&vec![test_data::genesis()]);
 		let b1 = test_data::block_h1();
+
+		println!("{:?}", b1.transactions()[0].inputs[0].script_sig());
+
 		let verifier = ChainVerifier::new(Arc::new(storage));
 		assert_eq!(Chain::Main, verifier.verify(&b1).unwrap());
 	}
diff --git a/verification/src/lib.rs b/verification/src/lib.rs
index 02ab979e..88ba9b3e 100644
--- a/verification/src/lib.rs
+++ b/verification/src/lib.rs
@@ -50,6 +50,8 @@ pub enum Error {
 	/// Maximum sigops operations exceeded - will not provide how much it was in total
 	/// since it stops counting once `MAX_BLOCK_SIGOPS` is reached
 	MaximumSigops,
+	/// Coinbase signature is not in the range 2-100
+	CoinbaseSignatureLength(usize),
 }
 
 #[derive(Debug, PartialEq)]