diff --git a/modules/chain/dap_chain_cell.c b/modules/chain/dap_chain_cell.c
index e42462485c7b289ae53889b4a74f167e661609db..671a4f7195349e77cb3363553fba9646df1d382a 100644
--- a/modules/chain/dap_chain_cell.c
+++ b/modules/chain/dap_chain_cell.c
@@ -259,6 +259,7 @@ int dap_chain_cell_load(dap_chain_t *a_chain, dap_chain_cell_t *a_cell)
         return -1;
     }
     int l_ret = 0;
+    size_t l_full_size = 0;
     dap_chain_cell_file_header_t *l_hdr = NULL;
     if (a_chain->is_mapped) {
         l_hdr = (dap_chain_cell_file_header_t*)a_cell->map;
@@ -270,6 +271,7 @@ int dap_chain_cell_load(dap_chain_t *a_chain, dap_chain_cell_t *a_cell)
             DAP_DELETE(l_hdr);
             return -2;
         }
+        l_full_size += sizeof(dap_chain_cell_file_header_t);
     }
     if (l_hdr->signature != DAP_CHAIN_CELL_FILE_SIGNATURE) {
         log_it(L_ERROR, "Wrong signature in chain \"%s\", possible file corrupt", a_cell->file_storage_path);
@@ -284,7 +286,7 @@ int dap_chain_cell_load(dap_chain_t *a_chain, dap_chain_cell_t *a_cell)
         return -4;
     }
 
-    uint64_t q = 0, l_full_size = 0;
+    uint64_t q = 0;
     if (a_chain->is_mapped) {
         a_cell->map_pos = a_cell->map + sizeof(dap_chain_cell_file_header_t);
         for (uint64_t l_el_size = 0; a_cell->map_pos < a_cell->map_end && ( l_el_size = *(uint64_t*)a_cell->map_pos ); ++q, a_cell->map_pos += l_el_size) {
@@ -332,7 +334,7 @@ static int s_file_write_header(dap_chain_cell_t *a_cell)
         return -2;
     } else {
         fseek(a_cell->file_storage, 0L, SEEK_END);
-        if (ftell(a_cell->file_storage) > (ssize_t)sizeof(dap_chain_cell_file_header_t)) {
+        if (ftell(a_cell->file_storage) >= (ssize_t)sizeof(dap_chain_cell_file_header_t)) {
             log_it(L_ERROR, "Chain cell \"%s\" 0x%016"DAP_UINT64_FORMAT_X" is already not empty!",
                    a_cell->file_storage_path, a_cell->id.uint64);
             return -3;
diff --git a/modules/common/dap_chain_datum.c b/modules/common/dap_chain_datum.c
index 54d06bfa0397b406e8e4218dc983abe0def4087f..b9a4e87d264c7989363dcebcfaec996f83842817 100644
--- a/modules/common/dap_chain_datum.c
+++ b/modules/common/dap_chain_datum.c
@@ -950,7 +950,6 @@ bool dap_chain_datum_dump_tx_json(dap_chain_datum_tx_t *a_datum,
             
         } break;
         case TX_ITEM_TYPE_VOTING:{
-            char l_tmp_buff[10]={0};
             int l_tsd_size = 0;
             dap_chain_tx_tsd_t *l_item = (dap_chain_tx_tsd_t *)dap_chain_datum_tx_item_get(a_datum, 0, TX_ITEM_TYPE_TSD, &l_tsd_size);
             if (!l_item || !l_tsd_size)
@@ -963,8 +962,7 @@ bool dap_chain_datum_dump_tx_json(dap_chain_datum_tx_t *a_datum,
             dap_list_t *l_temp = l_voting_params->answers_list;
             uint8_t l_index = 0;
             while (l_temp) {
-                sprintf(l_tmp_buff, "%i", l_index);
-                json_object_object_add(json_obj_item, l_tmp_buff, json_object_new_string((char *)l_temp->data));
+                json_object_object_add(json_obj_item, dap_itoa(l_index), json_object_new_string((char *)l_temp->data));
                 l_index++;
                 l_temp = l_temp->next;
             }
@@ -973,8 +971,7 @@ bool dap_chain_datum_dump_tx_json(dap_chain_datum_tx_t *a_datum,
                 json_object_object_add(json_obj_item,"Voting expire", json_object_new_string(l_tmp_buf));                
             }
             if (l_voting_params->votes_max_count) {
-                sprintf(l_tmp_buff, "%"DAP_UINT64_FORMAT_U, l_voting_params->votes_max_count);
-                json_object_object_add(json_obj_item, "Votes max count", json_object_new_string(l_tmp_buff));
+                json_object_object_add(json_obj_item, "Votes max count", json_object_new_uint64(l_voting_params->votes_max_count));
             }
             json_object_object_add(json_obj_item,"Changing vote is", l_voting_params->vote_changing_allowed ? json_object_new_string("available") : 
                                     json_object_new_string("not available"));
@@ -987,13 +984,11 @@ bool dap_chain_datum_dump_tx_json(dap_chain_datum_tx_t *a_datum,
             DAP_DELETE(l_voting_params);
         } break;
         case TX_ITEM_TYPE_VOTE:{
-            char l_tmp_buff[10]={0};
             dap_chain_tx_vote_t *l_vote_item = (dap_chain_tx_vote_t *)item;
             const char *l_hash_str = dap_chain_hash_fast_to_str_static(&l_vote_item->voting_hash);
             json_object_object_add(json_obj_item,"item type", json_object_new_string("VOTE"));
             json_object_object_add(json_obj_item,"Voting hash", json_object_new_string(l_hash_str));
-            sprintf(l_tmp_buff,"%"DAP_UINT64_FORMAT_U"",l_vote_item->answer_idx);
-            json_object_object_add(json_obj_item,"Vote answer idx", json_object_new_string(l_tmp_buff));
+            json_object_object_add(json_obj_item,"Vote answer idx", json_object_new_uint64(l_vote_item->answer_idx));
 
         } break;
         default:
diff --git a/modules/service/stake/dap_chain_net_srv_stake_pos_delegate.c b/modules/service/stake/dap_chain_net_srv_stake_pos_delegate.c
index 9fcb720170da028dd4e2bc6e7943ecb3e867ceb8..e09ab6159f91eb2590ba1d82c817eacc2b36d0fe 100644
--- a/modules/service/stake/dap_chain_net_srv_stake_pos_delegate.c
+++ b/modules/service/stake/dap_chain_net_srv_stake_pos_delegate.c
@@ -152,7 +152,7 @@ int dap_chain_net_srv_stake_net_add(dap_chain_net_id_t a_net_id)
     l_srv_stake->delegate_allowed_min = dap_chain_coins_to_balance("1.0");
     dap_list_t *l_list_new = dap_list_append(s_srv_stake_list, l_srv_stake);
     if (dap_list_last(l_list_new) == dap_list_last(s_srv_stake_list)) {
-        log_it(L_ERROR, "Can't add net %" DAP_UINT64_FORMAT_x "to stake service net list", a_net_id.uint64);
+        log_it(L_ERROR, "Can't add net %" DAP_UINT64_FORMAT_X " to stake service net list", a_net_id.uint64);
         DAP_DELETE(l_srv_stake);
         return -2;
     }