diff --git a/service/src/ocall_bridge/bridge_api.rs b/service/src/ocall_bridge/bridge_api.rs
index 2d098ae2cd..ed93d3b76a 100644
--- a/service/src/ocall_bridge/bridge_api.rs
+++ b/service/src/ocall_bridge/bridge_api.rs
@@ -200,7 +200,7 @@ pub trait MetricsBridge {
 /// Trait for all the OCalls related to sidechain operations
 #[cfg_attr(test, automock)]
 pub trait SidechainBridge {
-	fn propose_sidechain_blocks(&self, signed_blocks_encoded: Vec<u8>) -> OCallBridgeResult<()>;
+	fn propose_sidechain_blocks(&self, signed_blocks_encoded: &[u8]) -> OCallBridgeResult<()>;
 
 	fn store_sidechain_blocks(&self, signed_blocks_encoded: Vec<u8>) -> OCallBridgeResult<()>;
 
diff --git a/service/src/ocall_bridge/ffi/propose_sidechain_blocks.rs b/service/src/ocall_bridge/ffi/propose_sidechain_blocks.rs
index 21ff07d0bb..79c201361a 100644
--- a/service/src/ocall_bridge/ffi/propose_sidechain_blocks.rs
+++ b/service/src/ocall_bridge/ffi/propose_sidechain_blocks.rs
@@ -37,8 +37,8 @@ fn propose_sidechain_blocks(
 	signed_blocks_size: u32,
 	sidechain_api: Arc<dyn SidechainBridge>,
 ) -> sgx_status_t {
-	let signed_blocks_vec: Vec<u8> =
-		unsafe { Vec::from(slice::from_raw_parts(signed_blocks_ptr, signed_blocks_size as usize)) };
+	let signed_blocks_vec =
+		unsafe { slice::from_raw_parts(signed_blocks_ptr, signed_blocks_size as usize) };
 
 	match sidechain_api.propose_sidechain_blocks(signed_blocks_vec) {
 		Ok(_) => sgx_status_t::SGX_SUCCESS,
diff --git a/service/src/ocall_bridge/sidechain_ocall.rs b/service/src/ocall_bridge/sidechain_ocall.rs
index fdc801fbe8..03cf5f44ac 100644
--- a/service/src/ocall_bridge/sidechain_ocall.rs
+++ b/service/src/ocall_bridge/sidechain_ocall.rs
@@ -67,21 +67,22 @@ where
 	PeerBlockFetcher: FetchBlocksFromPeer<SignedBlockType = SignedSidechainBlock>,
 	TokioHandle: GetTokioHandle,
 {
-	fn propose_sidechain_blocks(&self, signed_blocks_encoded: Vec<u8>) -> OCallBridgeResult<()> {
+	fn propose_sidechain_blocks(&self, signed_blocks_encoded: &[u8]) -> OCallBridgeResult<()> {
 		// TODO: improve error handling, using a mut status is not good design?
 		let mut status: OCallBridgeResult<()> = Ok(());
 
+		let mut slice = signed_blocks_encoded;
 		// handle blocks
-		let signed_blocks: Vec<SignedSidechainBlock> =
-			match Decode::decode(&mut signed_blocks_encoded.as_slice()) {
-				Ok(blocks) => blocks,
-				Err(_) => {
-					status = Err(OCallBridgeError::ProposeSidechainBlock(
-						"Could not decode signed blocks".to_string(),
-					));
-					vec![]
-				},
-			};
+
+		let signed_blocks: Vec<SignedSidechainBlock> = match Decode::decode(&mut slice) {
+			Ok(blocks) => blocks,
+			Err(_) => {
+				status = Err(OCallBridgeError::ProposeSidechainBlock(
+					"Could not decode signed blocks".to_string(),
+				));
+				vec![]
+			},
+		};
 
 		if !signed_blocks.is_empty() {
 			info!(
diff --git a/service/src/ocall_bridge/test/mocks/sidechain_bridge_mock.rs b/service/src/ocall_bridge/test/mocks/sidechain_bridge_mock.rs
index 65a81c2cf2..274dd79d2c 100644
--- a/service/src/ocall_bridge/test/mocks/sidechain_bridge_mock.rs
+++ b/service/src/ocall_bridge/test/mocks/sidechain_bridge_mock.rs
@@ -31,7 +31,7 @@ impl SidechainBridgeMock {
 }
 
 impl SidechainBridge for SidechainBridgeMock {
-	fn propose_sidechain_blocks(&self, _signed_blocks_encoded: Vec<u8>) -> OCallBridgeResult<()> {
+	fn propose_sidechain_blocks(&self, _signed_blocks_encoded: &[u8]) -> OCallBridgeResult<()> {
 		Ok(())
 	}