diff --git a/rpc/src/v1/impls/eth.rs b/rpc/src/v1/impls/eth.rs
index f90995ffe..606a1ba6d 100644
--- a/rpc/src/v1/impls/eth.rs
+++ b/rpc/src/v1/impls/eth.rs
@@ -23,7 +23,7 @@ use util::sha3::*;
 use ethcore::client::*;
 use ethcore::views::*;
 use v1::traits::{Eth, EthFilter};
-use v1::types::{Block, BlockNumber, Bytes, SyncStatus};
+use v1::types::{Block, BlockTransactions, BlockNumber, Bytes, SyncStatus};
 
 /// Eth rpc implementation.
 pub struct EthClient {
@@ -125,7 +125,7 @@ impl Eth for EthClient {
 
 	fn block(&self, params: Params) -> Result<Value, Error> {
 		match from_params::<(H256, bool)>(params) {
-			Ok((hash, _include_txs)) => match (self.client.block_header(&hash), self.client.block_total_difficulty(&hash)) {
+			Ok((hash, include_txs)) => match (self.client.block_header(&hash), self.client.block_total_difficulty(&hash)) {
 				(Some(bytes), Some(total_difficulty)) => {
 					let view = HeaderView::new(&bytes);
 					let block = Block {
@@ -145,7 +145,14 @@ impl Eth for EthClient {
 						difficulty: view.difficulty(),
 						total_difficulty: total_difficulty,
 						uncles: vec![],
-						transactions: vec![]
+						transactions: {
+							if include_txs {
+								BlockTransactions::Hashes(vec![])
+							} else {
+								BlockTransactions::Full(vec![])
+							}
+						},
+						extra_data: Bytes::default()
 					};
 					to_value(&block)
 				},
diff --git a/rpc/src/v1/types/block.rs b/rpc/src/v1/types/block.rs
index 92ff5c8a6..ae5e59fbd 100644
--- a/rpc/src/v1/types/block.rs
+++ b/rpc/src/v1/types/block.rs
@@ -14,10 +14,28 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use serde::{Serialize, Serializer};
 use util::hash::*;
 use util::uint::*;
+use v1::types::{Bytes, Transaction};
 
-#[derive(Default, Debug, Serialize)]
+#[derive(Debug)]
+pub enum BlockTransactions {
+	Hashes(Vec<U256>),
+	Full(Vec<Transaction>)
+}
+
+impl Serialize for BlockTransactions {
+	fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+	where S: Serializer {
+		match *self {
+			BlockTransactions::Hashes(ref hashes) => hashes.serialize(serializer),
+			BlockTransactions::Full(ref ts) => ts.serialize(serializer)
+		}
+	}
+}
+
+#[derive(Debug, Serialize)]
 pub struct Block {
 	pub hash: H256,
 	#[serde(rename="parentHash")]
@@ -38,9 +56,8 @@ pub struct Block {
 	pub gas_used: U256,
 	#[serde(rename="gasLimit")]
 	pub gas_limit: U256,
-	// TODO: figure out how to properly serialize bytes
-	//#[serde(rename="extraData")]
-	//extra_data: Vec<u8>,
+	#[serde(rename="extraData")]
+	pub extra_data: Bytes,
 	#[serde(rename="logsBloom")]
 	pub logs_bloom: H2048,
 	pub timestamp: U256,
@@ -48,5 +65,5 @@ pub struct Block {
 	#[serde(rename="totalDifficulty")]
 	pub total_difficulty: U256,
 	pub uncles: Vec<U256>,
-	pub transactions: Vec<U256>
+	pub transactions: BlockTransactions
 }
diff --git a/rpc/src/v1/types/mod.rs b/rpc/src/v1/types/mod.rs
index 226e7e9a6..2286c69a1 100644
--- a/rpc/src/v1/types/mod.rs
+++ b/rpc/src/v1/types/mod.rs
@@ -20,7 +20,7 @@ mod bytes;
 mod sync;
 mod transaction;
 
-pub use self::block::Block;
+pub use self::block::{Block, BlockTransactions};
 pub use self::block_number::BlockNumber;
 pub use self::bytes::Bytes;
 pub use self::sync::SyncStatus;