diff --git a/.vscode/settings.json b/.vscode/settings.json
index 579c41e..f900d9e 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,5 +1,6 @@
 {
   "cSpell.words": [
+    "AGPL",
     "Algo",
     "Authed",
     "Authorise",
diff --git a/public/locales/en.json b/public/locales/en.json
index 7387b52..ebb2242 100644
--- a/public/locales/en.json
+++ b/public/locales/en.json
@@ -423,6 +423,8 @@
     "buttonEditContact": "Edit in address book",
     "buttonEditWallet": "Edit wallet",
 
+    "tooltipV1Address": "Transactions cannot be sent to v1 addresses, as they have been deprecated.",
+
     "cardRecentTransactionsTitle": "Recent transactions",
     "cardNamesTitle": "Names",
 
diff --git a/src/pages/addresses/AddressButtonRow.tsx b/src/pages/addresses/AddressButtonRow.tsx
index fc6ca0b..b207797 100644
--- a/src/pages/addresses/AddressButtonRow.tsx
+++ b/src/pages/addresses/AddressButtonRow.tsx
@@ -1,11 +1,13 @@
 // Copyright (c) 2020-2021 Drew Lemmy
 // This file is part of KristWeb 2 under AGPL-3.0.
 // Full details: https://github.com/tmpim/KristWeb2/blob/master/LICENSE.txt
-import { Button } from "antd";
+import { Button, Tooltip } from "antd";
 import { SendOutlined, SwapOutlined, UserAddOutlined, EditOutlined } from "@ant-design/icons";
 
 import { useTranslation } from "react-i18next";
 
+import { isV1Address } from "@utils/currency";
+
 import { KristAddressWithNames } from "@api/lookup";
 import { Wallet } from "@wallets";
 import { WalletEditButton } from "../wallets/WalletEditButton";
@@ -19,23 +21,31 @@
 export function AddressButtonRow({ address, myWallet }: Props): JSX.Element {
   const { t } = useTranslation();
 
+  const isV1 = address && isV1Address(address.address);
+
+  const sendButton = <Button
+    type="primary"
+    icon={myWallet ? <SwapOutlined /> : <SendOutlined />}
+    disabled={isV1}
+  >
+    {t(myWallet ? "address.buttonTransferKrist" : "address.buttonSendKrist",
+      { address: address.address })}
+  </Button>;
+
   return <>
     {/* Send/transfer Krist button */}
-    <SendTransactionModalLink to={address.address}>
-      <Button
-        type="primary"
-        icon={myWallet
-          ? <SwapOutlined />
-          : <SendOutlined />}
-      >
-        {t(
-          myWallet
-            ? "address.buttonTransferKrist"
-            : "address.buttonSendKrist",
-          { address: address.address }
-        )}
-      </Button>
-    </SendTransactionModalLink>
+    {isV1
+      ? ( // Disable the button and show a tooltip for V1 addresses
+        <Tooltip title={t("address.tooltipV1Address")}>
+          {sendButton}
+        </Tooltip>
+      )
+      : ( // Otherwise, enable the button
+        <SendTransactionModalLink to={address.address}>
+          {sendButton}
+        </SendTransactionModalLink>
+      )}
+
 
     {/* Add contact/edit wallet button */}
     {/* TODO: Change this to edit if they're already a contact */}
diff --git a/src/pages/addresses/AddressPage.less b/src/pages/addresses/AddressPage.less
index a96abc7..0e53861 100644
--- a/src/pages/addresses/AddressPage.less
+++ b/src/pages/addresses/AddressPage.less
@@ -29,8 +29,9 @@
 
     .ant-btn {
       margin-right: @margin-md;
-      &:last-child { margin-right: 0; }
     }
+
+    > .ant-btn:last-child { margin-right: 0; }
   }
 
   .address-wallet-row {
diff --git a/src/utils/currency.ts b/src/utils/currency.ts
index a6bbfff..feaff7c 100644
--- a/src/utils/currency.ts
+++ b/src/utils/currency.ts
@@ -120,6 +120,9 @@
     : getAddressRegexV2(addressPrefix).test(address);
 }
 
+export const v1AddressRegex = /^[a-f0-9]{10}$/;
+export const isV1Address = (address: string): boolean =>
+  v1AddressRegex.test(address);
 
 // -----------------------------------------------------------------------------
 // MISC