diff --git a/lib/modules/blockchain/blockchain/src/dubp/check/mod.rs b/lib/modules/blockchain/blockchain/src/dubp/check/mod.rs
index f7467970c82c25b156ea10ae30fbf651f00c3f76..322b0a7a32f63d2894cb53895413b866413c1f91 100644
--- a/lib/modules/blockchain/blockchain/src/dubp/check/mod.rs
+++ b/lib/modules/blockchain/blockchain/src/dubp/check/mod.rs
@@ -92,7 +92,7 @@ pub fn verify_block_validity<W: WebOfTrust>(
     if previous_block_opt.is_none() {
         return Err(BlockError::InvalidBlock(InvalidBlockError::NoPreviousBlock));
     }
-    let previous_block = previous_block_opt.expect("safe unwrap");
+    let previous_block = previous_block_opt.unwrap_or_else(|| panic!(dbg!("dev error")));
 
     // Block version must not decrease
     if previous_block.version > block.version {
@@ -110,12 +110,13 @@ pub fn verify_block_validity<W: WebOfTrust>(
     }
 
     // BR_G100 - issuer is member
-    match readers::identity::get_identity(identities_db, &block.issuers[0])?
-        .expect("safe unwrap")
-        .state
+    if let entities::identity::DALIdentityState::Member(_) =
+        readers::identity::get_identity(identities_db, &block.issuers[0])?
+            .unwrap_or_else(|| panic!(dbg!("dev error")))
+            .state
     {
-        entities::identity::DALIdentityState::Member(_) => {}
-        _ => return Err(invalid_rule_error(InvalidRuleError::NotMemberIssuer)),
+    } else {
+        return Err(invalid_rule_error(InvalidRuleError::NotMemberIssuer));
     }
 
     // BR_G04 - issuers count
@@ -154,15 +155,15 @@ mod tests {
     use durs_blockchain_dal::entities::identity::*;
 
     #[test]
-    fn test_verify_blocks() {
+    fn test_verify_blocks() -> Result<(), BlockError> {
         let blocks_dbs = BlocksV10DBs::open(None);
         let wot_dbs = WotsV10DBs::open(None);
         let wot_index: HashMap<PubKey, NodeId> = HashMap::new();
 
-        let idty_a = identity::gen_mock_idty(pubkey('A'), BlockId(0));
+        let idty_a = identity::gen_mock_idty(pubkey('A'), BlockNumber(0));
         let pubkey_a = idty_a.issuers()[0];
 
-        let idty_b = identity::gen_mock_idty(pubkey('B'), BlockId(0));
+        let idty_b = identity::gen_mock_idty(pubkey('B'), BlockNumber(0));
         let pubkey_b = idty_b.issuers()[0];
 
         let mut blocks = gen_empty_timed_blocks(2, 300);
@@ -173,7 +174,7 @@ mod tests {
         blocks[0].identities.push(idty_a.clone());
         blocks[0].identities.push(idty_b.clone());
 
-        verify_genesis_block_validity(&blocks[0]).expect("Fail to valid genesis block");
+        verify_genesis_block_validity(&blocks[0])?;
 
         blocks_dbs
             .blockchain_db
@@ -238,7 +239,8 @@ mod tests {
             &wot_dbs.certs_db,
             &wot_index,
             &wot_dbs.wot_db,
-        )
-        .expect("Fail to valid block");
+        )?;
+
+        Ok(())
     }
 }