diff --git a/massa-grpc/src/api.rs b/massa-grpc/src/api.rs
index 1447b5638d6..a578176ee5b 100644
--- a/massa-grpc/src/api.rs
+++ b/massa-grpc/src/api.rs
@@ -7,6 +7,7 @@ use massa_consensus_exports::{ConsensusChannels, ConsensusController};
 use massa_models::{
     block::{BlockDeserializer, BlockDeserializerArgs, SecureShareBlock},
     config::{ENDORSEMENT_COUNT, MAX_OPERATIONS_PER_BLOCK, THREAD_COUNT},
+    error::ModelsError,
     secure_share::SecureShareDeserializer,
 };
 use massa_pool_exports::PoolChannels;
@@ -193,9 +194,23 @@ impl grpc::grpc_server::Grpc for MassaService {
                                     Ok(tuple) => {
                                         let (rest, res_block): (&[u8], SecureShareBlock) = tuple;
                                         if rest.is_empty() {
-                                            if let Ok(_verify_signature) =
-                                                //TODO add endorsements signatures check
-                                                res_block.verify_signature()
+                                            if let Ok(_verify_signature) = res_block
+                                                .verify_signature()
+                                                .and_then(|_| {
+                                                    res_block.content.header.verify_signature()
+                                                })
+                                                .map(|_| {
+                                                    res_block
+                                                        .content
+                                                        .header
+                                                        .content
+                                                        .endorsements
+                                                        .iter()
+                                                        .map(|endorsement| {
+                                                            endorsement.verify_signature()
+                                                        })
+                                                        .collect::<Vec<Result<(), ModelsError>>>()
+                                                })
                                             {
                                                 let block_id = res_block.id;
                                                 let slot = res_block.content.header.content.slot;
@@ -255,12 +270,11 @@ impl grpc::grpc_server::Grpc for MassaService {
                                                 .await;
                                             };
                                         } else {
-                                            let error = "incomplete deserialization";
                                             let _res = sendblocks_notify_error(
                                                 req_content.id.clone(),
                                                 tx.clone(),
                                                 tonic::Code::InvalidArgument,
-                                                error.to_owned(),
+                                                "incomplete deserialization".to_owned(),
                                             )
                                             .await;
                                         }