diff --git a/www/js/version.json b/www/js/version.json
index a8fc324..6893d93 100644
--- a/www/js/version.json
+++ b/www/js/version.json
@@ -1,5 +1,5 @@
 {
-  "VERSION": "v0.7.66",
-  "VERSION_NUMBER": "0.7.66",
-  "BUILD_DATE": "2026-06-30T11:47:22.403Z"
+  "VERSION": "v0.7.67",
+  "VERSION_NUMBER": "0.7.67",
+  "BUILD_DATE": "2026-06-30T11:59:52.299Z"
 }
diff --git a/www/ndk-worker.js b/www/ndk-worker.js
index a2c144c..2678d47 100644
--- a/www/ndk-worker.js
+++ b/www/ndk-worker.js
@@ -4568,6 +4568,16 @@ async function handleWalletCreateDeposit(requestId, amount, mint, port) {
 }
 
 async function handleWalletPayInvoice(requestId, invoice, mint, port) {
+    const startedAt = Date.now();
+    const traceId = `walletPayInvoice:${requestId}`;
+    const log = (phase, extra = null) => {
+        if (extra === null) {
+            console.log(`[Worker] ${traceId} +${Date.now() - startedAt}ms ${phase}`);
+        } else {
+            console.log(`[Worker] ${traceId} +${Date.now() - startedAt}ms ${phase}`, extra);
+        }
+    };
+
     try {
         await ensureDirectWalletLoaded();
 
@@ -4580,6 +4590,11 @@ async function handleWalletPayInvoice(requestId, invoice, mint, port) {
             ? [requestedMint, ...knownMints.filter((m) => m !== requestedMint)]
             : [...knownMints].sort((a, b) => getProofTotal(directProofStore[b]) - getProofTotal(directProofStore[a]));
 
+        log('mint-selection', {
+            requestedMint: requestedMint || null,
+            orderedMints: orderedMints.map((m) => ({ mint: m, proofBalance: getProofTotal(directProofStore[m]) }))
+        });
+
         let payResult = null;
         let usedMint = null;
         let paidAmountSats = 0;
@@ -4588,7 +4603,11 @@ async function handleWalletPayInvoice(requestId, invoice, mint, port) {
         for (const mintUrl of orderedMints) {
             try {
                 const proofs = Array.isArray(directProofStore[mintUrl]) ? directProofStore[mintUrl] : [];
+                const proofBalance = getProofTotal(proofs);
+                log('mint attempt:start', { mintUrl, proofBalance, proofCount: proofs.length });
+
                 if (proofs.length === 0) {
+                    log('mint attempt:no-proofs', { mintUrl });
                     attemptErrors.push({ mint: mintUrl, message: 'No proofs available for mint' });
                     continue;
                 }
@@ -4598,13 +4617,16 @@ async function handleWalletPayInvoice(requestId, invoice, mint, port) {
                 const quoteAmount = Number(meltQuote?.amount || 0);
                 const quoteFeeReserve = Number(meltQuote?.fee_reserve || 0);
                 const required = quoteAmount + quoteFeeReserve;
+                log('mint attempt:quote', { mintUrl, quoteAmount, quoteFeeReserve, required });
+
                 if (!Number.isFinite(required) || required <= 0) {
+                    log('mint attempt:invalid-quote', { mintUrl, required });
                     attemptErrors.push({ mint: mintUrl, message: 'Invalid melt quote amount' });
                     continue;
                 }
 
-                const proofBalance = getProofTotal(proofs);
                 if (proofBalance < required) {
+                    log('mint attempt:insufficient', { mintUrl, proofBalance, required });
                     attemptErrors.push({ mint: mintUrl, message: `Insufficient funds on mint (${proofBalance} sats)` });
                     continue;
                 }
@@ -4612,6 +4634,8 @@ async function handleWalletPayInvoice(requestId, invoice, mint, port) {
                 const sendResult = await wallet.send(required, proofs);
                 const keep = Array.isArray(sendResult?.keep) ? sendResult.keep : [];
                 const sendProofs = Array.isArray(sendResult?.send) ? sendResult.send : [];
+                log('mint attempt:send-split', { mintUrl, keepCount: keep.length, sendCount: sendProofs.length });
+
                 const meltResult = await wallet.meltProofs(meltQuote, sendProofs);
                 const change = Array.isArray(meltResult?.change) ? meltResult.change : [];
                 upsertMintProofs(mintUrl, [...keep, ...change]);
@@ -4622,19 +4646,25 @@ async function handleWalletPayInvoice(requestId, invoice, mint, port) {
                     ? quoteAmount
                     : spentAmount;
 
+                log('mint attempt:success', { mintUrl, paidAmountSats, changeAmount, preimage: meltResult?.preimage || null });
+
                 usedMint = mintUrl;
                 payResult = meltResult;
                 break;
             } catch (error) {
+                log('mint attempt:error', { mintUrl, message: error?.message || String(error) });
                 attemptErrors.push({ mint: mintUrl, message: error?.message || String(error) });
             }
         }
 
         if (!payResult || !usedMint) {
             const detail = attemptErrors.map((entry) => `${entry.mint || 'unknown'}: ${entry.message}`).join(' | ');
+            log('all-mints-failed', { attemptErrors });
             throw new Error(`Failed to pay invoice. ${detail || 'No mint could complete melt'}`);
         }
 
+        log('paid', { usedMint, paidAmountSats, preimage: payResult?.preimage || null });
+
         const tx = appendDirectTransaction({
             type: 'pay',
             amount: Number.isFinite(paidAmountSats) && paidAmountSats > 0
@@ -4680,6 +4710,7 @@ async function handleWalletPayInvoice(requestId, invoice, mint, port) {
             }
         })();
     } catch (error) {
+        log('error', { message: error?.message || String(error), stack: error?.stack || null });
         port.postMessage({ type: 'response', requestId, error: error.message });
     }
 }