From 8581aca511102358b4619af39844b7a75deab736 Mon Sep 17 00:00:00 2001
From: Riccardo Casatta <riccardo@casatta.it>
Date: Tue, 13 Jan 2026 15:49:39 +0100
Subject: [PATCH] use lastUsedIndex instead of a wallet full scan

---
 index.ts          |  7 +++++--
 package-lock.json | 16 +++++++++++-----
 package.json      |  2 +-
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/index.ts b/index.ts
index 2f0713e..bec300d 100644
--- a/index.ts
+++ b/index.ts
@@ -1113,8 +1113,11 @@ function route(): void {
 
 async function getClaimAddress(): Promise<lwk.Address> {
     const wollet = getWollet();
-    syncWallet(wollet);
-    const claimAddress = wollet.address(null).address();
+    const client = getEsploraClient();
+    const lastUsedIndex = await client.lastUsedIndex(wollet.descriptor());
+    console.log('Last used indexes:', lastUsedIndex.external, lastUsedIndex.internal);
+    const indexToUse = lastUsedIndex.external != null ? lastUsedIndex.external + 1 : 0;
+    const claimAddress = wollet.address(indexToUse).address();
     return claimAddress;
 }
 
diff --git a/package-lock.json b/package-lock.json
index f523398..c425c70 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,7 +5,7 @@
     "packages": {
         "": {
             "dependencies": {
-                "lwk_wasm": "^0.13.1"
+                "lwk_wasm": "file:/home/casatta/git/lwk/lwk_wasm/pkg"
             },
             "devDependencies": {
                 "@eslint/js": "^9.36.0",
@@ -21,6 +21,14 @@
                 "webpack-dev-server": "^4.15.1"
             }
         },
+        "../../../casat/code/lwk_wasm/pkg": {
+            "extraneous": true
+        },
+        "../lwk/lwk_wasm/pkg": {
+            "name": "lwk_wasm",
+            "version": "0.13.1",
+            "license": "MIT OR BSD-2-Clause"
+        },
         "node_modules/@discoveryjs/json-ext": {
             "version": "0.5.7",
             "resolved": "https://registry.npmjs.org/@discoveryjs/json-ext/-/json-ext-0.5.7.tgz",
@@ -3401,10 +3409,8 @@
             "license": "MIT"
         },
         "node_modules/lwk_wasm": {
-            "version": "0.13.1",
-            "resolved": "https://registry.npmjs.org/lwk_wasm/-/lwk_wasm-0.13.1.tgz",
-            "integrity": "sha512-H1JDqjo5dMY1pTh70v9De83C+NT+9rLeZSCJoclZuJ+sf6om0kNGa13/pP/g0S1JsHhiqMRwu9iEOiHYtF4Ffw==",
-            "license": "MIT OR BSD-2-Clause"
+            "resolved": "../lwk/lwk_wasm/pkg",
+            "link": true
         },
         "node_modules/math-intrinsics": {
             "version": "1.1.0",
diff --git a/package.json b/package.json
index d420b9c..8f6e983 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
         "deploy": "npm run build && npm run sync"
     },
     "dependencies": {
-        "lwk_wasm": "^0.13.1"
+        "lwk_wasm": "file:/home/casatta/git/lwk/lwk_wasm/pkg"
     },
     "devDependencies": {
         "@eslint/js": "^9.36.0",