diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index 084b9a66158..1d1a84e3751 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -109,22 +109,26 @@ QFont fixedPitchFont(bool use_embedded_font)
     return QFontDatabase::systemFont(QFontDatabase::FixedFont);
 }
 
-// Just some dummy data to generate a convincing random-looking (but consistent) address
-static const uint8_t dummydata[] = {0xeb,0x15,0x23,0x1d,0xfc,0xeb,0x60,0x92,0x58,0x86,0xb6,0x7d,0x06,0x52,0x99,0x92,0x59,0x15,0xae,0xb1,0x72,0xc0,0x66,0x47};
-
-// Generate a dummy address with invalid CRC, starting with the network prefix.
+// Return a pre-generated dummy bech32m address (P2TR) with invalid checksum.
 static std::string DummyAddress(const CChainParams &params)
 {
-    std::vector<unsigned char> sourcedata = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
-    sourcedata.insert(sourcedata.end(), dummydata, dummydata + sizeof(dummydata));
-    for(int i=0; i<256; ++i) { // Try every trailing byte
-        std::string s = EncodeBase58(sourcedata);
-        if (!IsValidDestinationString(s)) {
-            return s;
-        }
-        sourcedata[sourcedata.size()-1] += 1;
-    }
-    return "";
+    std::string addr;
+    switch (params.GetChainType()) {
+    case ChainType::MAIN:
+        addr = "bc1p35yvjel7srp783ztf8v6jdra7dhfzk5jaun8xz2qp6ws7z80n4tq2jku9f";
+        break;
+    case ChainType::SIGNET:
+    case ChainType::TESTNET:
+        addr = "tb1p35yvjel7srp783ztf8v6jdra7dhfzk5jaun8xz2qp6ws7z80n4tqa6qnlg";
+        break;
+    case ChainType::REGTEST:
+        addr = "bcrt1p35yvjel7srp783ztf8v6jdra7dhfzk5jaun8xz2qp6ws7z80n4tqsr2427";
+        break;
+    } // no default case, so the compiler can warn about missing cases
+    assert(!addr.empty());
+
+    if (Assume(!IsValidDestinationString(addr))) return addr;
+    return {};
 }
 
 void setupAddressWidget(QValidatedLineEdit *widget, QWidget *parent)