diff --git a/contracts/imports/dns-utils.fc b/contracts/imports/dns-utils.fc
index 8580e54..8105cc6 100644
--- a/contracts/imports/dns-utils.fc
+++ b/contracts/imports/dns-utils.fc
@@ -31,7 +31,8 @@ int get_top_domain_bits(slice domain) {
     return i;
 }
 
-slice read_domain_from_comment(slice in_msg_body) {
+;; Parse a human-readable TON comment into one slice
+slice read_comment(slice in_msg_body) {
     int need_break = 0;
     builder result = begin_cell();
     do {
@@ -46,6 +47,10 @@ slice read_domain_from_comment(slice in_msg_body) {
     return result.end_cell().begin_parse();
 }
 
+slice read_domain_from_comment(slice in_msg_body) {
+    return read_comment(in_msg_body);
+}
+
 int check_domain_string(slice domain) {
     int i = 0;
     int len = slice_bits(domain);
@@ -67,6 +72,28 @@ int check_domain_string(slice domain) {
     return i == len;
 }
 
+(slice, slice) split_by_semicolon(slice str) {
+    int i = 0;
+    int len = slice_bits(str);
+    int need_break = 0;
+    builder result1 = begin_cell();
+    do {
+        need_break = i == len;
+        if (~ need_break) {
+            int char = str~load_uint(8);
+            need_break = char == 59; ;; ';'
+            if (~ need_break) {
+                i += 8;
+            }
+            result1~store_uint(char, 8);
+            if (~ need_break & (i >= len)) {
+                throw(259);  ;; no ';' found
+            }
+        }
+    } until (need_break);
+    return (result1.end_cell().begin_parse(), str~load_bits(len - i));
+}
+
 (int, int) get_min_price_config(int domain_char_count) {
     if (domain_char_count == 4) {
         return (1000, 100);
diff --git a/contracts/nft-collection.fc b/contracts/nft-collection.fc
index dc63692..995d5ab 100644
--- a/contracts/nft-collection.fc
+++ b/contracts/nft-collection.fc
@@ -3,6 +3,9 @@
 #include "imports/op-codes.fc";
 #include "imports/params.fc";
 
+;; -1 if needed, 0 if not
+const signature_needed = -1;
+
 ;; storage scheme
 ;; cell collection_content
 ;; cell nft_item_code
@@ -68,6 +71,11 @@ slice calculate_nft_item_address(int wc, cell state_init) {
     send_raw_message(msg.end_cell(), 64); ;; carry all the remaining value of the inbound message, fee deducted from amount
 }
 
+int verify_signature(cell signature, slice sender_address, slice domain, int owner_key) {
+    cell option_data = begin_cell().store_slice(domain).store_slice(sender_address).end_cell();
+    return check_signature(slice_hash(option_data.begin_parse()), signature.begin_parse(), owner_key);
+}
+
 () recv_internal(int msg_value, cell in_msg_full, slice in_msg_body) impure {
     if (in_msg_body.slice_empty?()) { ;; bounce back empty messages
         throw(0xffff);
@@ -93,6 +101,12 @@ slice calculate_nft_item_address(int wc, cell state_init) {
         int item_index = slice_hash(domain);
 
         slice sender_address = cs~load_msg_addr();
+        if (signature_needed) {
+            ;; todo: do stuff here
+;;             cell signature = in_msg_body~load_ref();
+;;             throw_unless(205, verify_signature(signature, sender_address, domain, key));
+        }
+
         cell nft_content = begin_cell()
                 .store_slice(sender_address)
                 .store_ref(begin_cell().store_slice(domain).end_cell())
diff --git a/test/creation.spec.ts b/test/creation.spec.ts
index 95b2826..afe9a46 100644
--- a/test/creation.spec.ts
+++ b/test/creation.spec.ts
@@ -9,6 +9,7 @@ import * as main from "../contracts/main";
 import { internalMessage, randomAddress } from "./helpers";
 
 import { hex } from "../build/nft-collection.compiled.json";
+import {makeSnakeCell} from "../contracts/utils";
 
 describe("Creating items tests", () => {
   let contract: SmartContract;