diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 96ee943..5f345ad 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -3,11 +3,8 @@
   <component name="ChangeListManager">
     <list default="true" id="ddb8afd5-d3ba-47b1-b6d0-227403f1abf7" name="Changes" comment="Checkout">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/api.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/api.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/DomainResult.vue" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/DomainResult.vue" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/main.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/result.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/result.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/views/Checkout.vue" beforeDir="false" afterPath="$PROJECT_DIR$/src/views/Checkout.vue" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/components/Header.vue" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/Header.vue" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/utils.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/utils.ts" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -93,6 +90,8 @@
       <workItem from="1673123515646" duration="82000" />
       <workItem from="1673195751389" duration="2458000" />
       <workItem from="1673683299593" duration="12019000" />
+      <workItem from="1673906442760" duration="1896000" />
+      <workItem from="1674161982371" duration="2229000" />
     </task>
     <task id="LOCAL-00001" summary="Wrote the landing">
       <created>1670844191163</created>
diff --git a/src/components/Header.vue b/src/components/Header.vue
index cddbf2e..5502480 100644
--- a/src/components/Header.vue
+++ b/src/components/Header.vue
@@ -26,6 +26,8 @@
 </template>
 
 <script>
+import {convertAddress} from "../utils.ts";
+
 export default {
   name: "Header",
   props: {
@@ -43,8 +45,7 @@ export default {
       if (address_raw === undefined) {
         return '';
       }
-      // let address = convert_address(address_raw);
-      let address = address_raw;
+      let address = convertAddress(address_raw);
       return address.slice(0, 5) + '...' + address.slice(-4);
     }
   }
diff --git a/src/utils.ts b/src/utils.ts
index 8a98431..28113e5 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -54,4 +54,73 @@ export function qr_options(url: string, imageSize: number = 0.4, imageMargin: nu
 export function parse_zone(domain: string) {
     // extract the zone from the domain (e.g. example.ton from 123.example.ton)
     return domain.split('.').slice(1).join('.');
+}
+
+// look up tables
+const to_hex_array = [];
+// map from string to a number
+const to_byte_map: any = {};
+for (let ord = 0; ord <= 0xff; ord++) {
+    let s = ord.toString(16);
+    if (s.length < 2) {
+        s = "0" + s;
+    }
+    to_hex_array.push(s);
+    to_byte_map[s] = ord;
+}
+
+export function hexToBytes(s: string) {
+    s = s.toLowerCase();
+    const length2 = s.length;
+    if (length2 % 2 !== 0) {
+        throw "hex string must have length a multiple of 2";
+    }
+    const length = length2 / 2;
+    const result = new Uint8Array(length);
+    for (let i = 0; i < length; i++) {
+        const i2 = i * 2;
+        const b = s.substring(i2, i2 + 2);
+        if (!to_byte_map.hasOwnProperty(b)) throw new Error('invalid hex character ' + b);
+        result[i] = to_byte_map[b];
+    }
+    return result;
+}
+
+
+function crc16(data: any) {
+    const poly = 0x1021;
+    let reg = 0;
+    const message = new Uint8Array(data.length + 2);
+    message.set(data);
+    for (let byte of message) {
+        let mask = 0x80;
+        while (mask > 0) {
+            reg <<= 1;
+            if (byte & mask) {
+                reg += 1;
+            }
+            mask >>= 1
+            if (reg > 0xffff) {
+                reg &= 0xffff;
+                reg ^= poly;
+            }
+        }
+    }
+    return new Uint8Array([Math.floor(reg / 256), reg % 256]);
+}
+
+export function convertAddress(address: string) {
+    const addrSrc = hexToBytes(address.split(':')[1]);
+    const addr = new Int8Array(34);
+    addr[0] = 0x11;   // tag (bounceable)
+    addr[1] = 0;   // workchain
+    addr.set(addrSrc, 2);
+
+    const addressWithChecksum = new Uint8Array(36);
+    addressWithChecksum.set(addr);
+    addressWithChecksum.set(crc16(addr), 34);
+    // @ts-ignore
+    let addressBase64 = btoa(String.fromCharCode.apply(null, new Uint8Array(addressWithChecksum)));
+    addressBase64 = addressBase64.replace(/\+/g, '-').replace(/\//g, '_');
+    return addressBase64;
 }
\ No newline at end of file