diff --git a/__tests__/components/screens/WalletKit/DappMessageDisplay.test.tsx b/__tests__/components/screens/WalletKit/DappMessageDisplay.test.tsx
new file mode 100644
index 000000000..3948ed817
--- /dev/null
+++ b/__tests__/components/screens/WalletKit/DappMessageDisplay.test.tsx
@@ -0,0 +1,65 @@
+import { DappMessageDisplay } from "components/screens/WalletKit/DappMessageDisplay";
+import { renderWithProviders } from "helpers/testUtils";
+import React from "react";
+import { Dimensions, StyleSheet } from "react-native";
+
+jest.mock("hooks/useAppTranslation", () => ({
+  __esModule: true,
+  default: () => ({ t: (key: string) => key }),
+}));
+
+describe("DappMessageDisplay", () => {
+  it("renders the message content", () => {
+    const { getByTestId } = renderWithProviders(
+      <DappMessageDisplay message="hello world" />,
+    );
+
+    expect(getByTestId("message-display-content")).toHaveTextContent(
+      "hello world",
+    );
+  });
+
+  it("pretty-prints JSON messages", () => {
+    const { getByTestId } = renderWithProviders(
+      <DappMessageDisplay message='{"a":1}' />,
+    );
+
+    expect(getByTestId("message-display-content").props.children).toBe(
+      JSON.stringify({ a: 1 }, null, 2),
+    );
+  });
+
+  it("bounds the message scroll area so long messages cannot push the action buttons off-screen", () => {
+    const { getByTestId } = renderWithProviders(
+      <DappMessageDisplay message={"x".repeat(10000)} />,
+    );
+
+    const scrollView = getByTestId("message-display-content-scroll");
+    const style = StyleSheet.flatten(scrollView.props.style);
+
+    expect(style.maxHeight).toBeDefined();
+    expect(style.maxHeight).toBeLessThanOrEqual(
+      Dimensions.get("window").height * 0.5,
+    );
+  });
+
+  it("can shrink below the cap (with a usable floor) when the sheet needs the room", () => {
+    // With a security banner + stacked warning buttons the sheet's fixed
+    // content grows; the message box must yield height so the action buttons
+    // stay on screen, while keeping a scrollable sliver of the message.
+    const { getByTestId } = renderWithProviders(
+      <DappMessageDisplay message={"x".repeat(10000)} />,
+    );
+
+    const boxStyle = StyleSheet.flatten(
+      getByTestId("message-display").props.style,
+    );
+    const scrollStyle = StyleSheet.flatten(
+      getByTestId("message-display-content-scroll").props.style,
+    );
+
+    expect(boxStyle.flexShrink).toBe(1);
+    expect(scrollStyle.flexShrink).toBe(1);
+    expect(scrollStyle.minHeight).toBeGreaterThan(0);
+  });
+});
diff --git a/__tests__/helpers/walletKitValidation.test.ts b/__tests__/helpers/walletKitValidation.test.ts
index 8ecb0ca6b..6d663bda3 100644
--- a/__tests__/helpers/walletKitValidation.test.ts
+++ b/__tests__/helpers/walletKitValidation.test.ts
@@ -148,13 +148,22 @@ describe("validateSignMessageLength", () => {
     }
   });
 
-  it("returns valid for a message exactly at the 1 KB limit", () => {
+  it("allows a multi-KB JSON payload (limit is 10 KB, not 1 KB)", () => {
+    // Regression for stellar/freighter-mobile#957: dApps sign JSON payloads
+    // that routinely exceed 1 KB. SEP-53 imposes no size limit.
+    expect(SIGN_MESSAGE_MAX_BYTES).toBe(10240);
+    const message = JSON.stringify({ data: "a".repeat(4000) });
+    const result = validateSignMessageLength(message);
+    expect(result.valid).toBe(true);
+  });
+
+  it("returns valid for a message exactly at the limit", () => {
     const message = "a".repeat(SIGN_MESSAGE_MAX_BYTES);
     const result = validateSignMessageLength(message);
     expect(result.valid).toBe(true);
   });
 
-  it("returns error for a message exceeding 1 KB (ASCII)", () => {
+  it("returns error for a message exceeding the limit (ASCII)", () => {
     const message = "a".repeat(SIGN_MESSAGE_MAX_BYTES + 1);
     const result = validateSignMessageLength(message);
     expect(result.valid).toBe(false);
@@ -163,9 +172,9 @@ describe("validateSignMessageLength", () => {
     }
   });
 
-  it("returns error for a message exceeding 1 KB due to multi-byte UTF-8 chars", () => {
-    // Each emoji is 4 bytes in UTF-8 — 257 emojis = 1028 bytes > 1024
-    const message = "🚀".repeat(257);
+  it("returns error for a message exceeding the limit due to multi-byte UTF-8 chars", () => {
+    // Each emoji is 4 bytes in UTF-8, so this is 4 bytes over the limit
+    const message = "🚀".repeat(SIGN_MESSAGE_MAX_BYTES / 4 + 1);
     const result = validateSignMessageLength(message);
     expect(result.valid).toBe(false);
     if (!result.valid) {
@@ -173,9 +182,9 @@ describe("validateSignMessageLength", () => {
     }
   });
 
-  it("returns valid for multi-byte chars that stay within 1 KB", () => {
-    // 256 emojis = 1024 bytes — exactly at the limit
-    const message = "🚀".repeat(256);
+  it("returns valid for multi-byte chars that stay within the limit", () => {
+    // Each emoji is 4 bytes in UTF-8 — exactly at the limit
+    const message = "🚀".repeat(SIGN_MESSAGE_MAX_BYTES / 4);
     const result = validateSignMessageLength(message);
     expect(result.valid).toBe(true);
   });
diff --git a/src/components/screens/WalletKit/DappMessageDisplay.tsx b/src/components/screens/WalletKit/DappMessageDisplay.tsx
index 8f794c45f..700923b24 100644
--- a/src/components/screens/WalletKit/DappMessageDisplay.tsx
+++ b/src/components/screens/WalletKit/DappMessageDisplay.tsx
@@ -3,7 +3,7 @@ import { Text } from "components/sds/Typography";
 import useColors from "hooks/useColors";
 import React from "react";
 import { useTranslation } from "react-i18next";
-import { ScrollView, View } from "react-native";
+import { Dimensions, ScrollView, View } from "react-native";
 
 /**
  * Props for the DappMessageDisplay component
@@ -28,7 +28,7 @@ const isJsonString = (str: string): boolean => {
 /**
  * DappMessageDisplay component for showing SEP-53 messages
  * Displays the message with the SEP-53 prefix and handles JSON formatting
- * Dynamically increases height based on message length
+ * Grows with the message up to a capped height, then scrolls
  *
  * @component
  * @param {DappMessageDisplayProps} props - The component props
@@ -49,7 +49,13 @@ export const DappMessageDisplay: React.FC<DappMessageDisplayProps> = ({
   return (
     <View
       className="rounded-2xl p-4 my-3"
-      style={{ backgroundColor: themeColors.background.secondary }}
+      // flexShrink lets this box give up height first when the sheet content
+      // is taller than the screen (e.g. security banner + stacked warning
+      // buttons), keeping the action buttons visible.
+      style={{
+        backgroundColor: themeColors.background.secondary,
+        flexShrink: 1,
+      }}
       testID="message-display"
     >
       <View className="flex-row items-center gap-2 mb-4">
@@ -63,7 +69,19 @@ export const DappMessageDisplay: React.FC<DappMessageDisplayProps> = ({
           {t("common.message")}
         </Text>
       </View>
-      <ScrollView testID="message-display-content-scroll">
+      <ScrollView
+        // Cap the message area so long messages scroll instead of growing the
+        // sheet past the screen and pushing the action buttons out of view.
+        // flexShrink + minHeight let it shrink further when the rest of the
+        // sheet needs the room, while always leaving a usable scroll window.
+        style={{
+          maxHeight: Dimensions.get("window").height * 0.3,
+          flexShrink: 1,
+          minHeight: 56,
+        }}
+        showsVerticalScrollIndicator={false}
+        testID="message-display-content-scroll"
+      >
         <Text
           sm
           primary
diff --git a/src/components/screens/WalletKit/DappSignMessageBottomSheetContent.tsx b/src/components/screens/WalletKit/DappSignMessageBottomSheetContent.tsx
index 6fea8887e..24d67aed4 100644
--- a/src/components/screens/WalletKit/DappSignMessageBottomSheetContent.tsx
+++ b/src/components/screens/WalletKit/DappSignMessageBottomSheetContent.tsx
@@ -13,7 +13,16 @@ import { WalletKitSessionRequest } from "ducks/walletKit";
 import useAppTranslation from "hooks/useAppTranslation";
 import useColors from "hooks/useColors";
 import React, { useMemo } from "react";
-import { View } from "react-native";
+import { useWindowDimensions, View } from "react-native";
+import { useSafeAreaInsets } from "react-native-safe-area-context";
+
+/**
+ * Vertical space the bottom sheet adds around this content (drag handle plus
+ * the BottomSheetView paddings — see components/BottomSheet). Used to bound
+ * the content to the usable window height so the message box can flex-shrink
+ * instead of pushing the action buttons off-screen.
+ */
+const SHEET_CHROME_HEIGHT = 80;
 
 interface DappSignMessageBottomSheetContentProps {
   requestEvent: WalletKitSessionRequest | null;
@@ -46,6 +55,10 @@ export const DappSignMessageBottomSheetContent: React.FC<
 }) => {
   const { themeColors } = useColors();
   const { t } = useAppTranslation();
+  const { height: windowHeight } = useWindowDimensions();
+  const insets = useSafeAreaInsets();
+  const maxContentHeight =
+    windowHeight - insets.top - insets.bottom - SHEET_CHROME_HEIGHT;
 
   const accountList = useMemo(
     () => [
@@ -89,6 +102,7 @@ export const DappSignMessageBottomSheetContent: React.FC<
   return (
     <View
       className="flex-1 justify-center mt-2 gap-[16px]"
+      style={{ maxHeight: maxContentHeight }}
       testID="dapp-request-bottom-sheet"
     >
       <View className="flex-row items-center gap-[12px] w-full">
@@ -112,7 +126,9 @@ export const DappSignMessageBottomSheetContent: React.FC<
         securityWarningAction={securityWarningAction}
       />
 
-      <View className="gap-[12px]">
+      {/* flexShrink lets the message box inside absorb the squeeze when the
+          sheet is taller than the screen; the account list keeps its size. */}
+      <View className="gap-[12px]" style={{ flexShrink: 1 }}>
         <DappMessageDisplay message={message} />
         <List variant="secondary" items={accountList} />
       </View>
diff --git a/src/helpers/walletKitValidation.ts b/src/helpers/walletKitValidation.ts
index b5458b7c9..afd981918 100644
--- a/src/helpers/walletKitValidation.ts
+++ b/src/helpers/walletKitValidation.ts
@@ -16,8 +16,13 @@ export const ValidationErrorKeys = {
   AUTH_ENTRY_ADDRESS_MISMATCH: "walletKit.errorAuthEntryAddressMismatch",
 } as const;
 
-/** Max UTF-8 byte length for sign_message content per SEP-53. */
-export const SIGN_MESSAGE_MAX_BYTES = 1024;
+/**
+ * Max UTF-8 byte length for sign_message content. SEP-53 imposes no size
+ * limit (and the browser extension enforces none) — this is a sanity cap
+ * against absurd WalletConnect payloads, sized to comfortably fit the JSON
+ * payloads dApps actually sign (see stellar/freighter-mobile#957).
+ */
+export const SIGN_MESSAGE_MAX_BYTES = 10240;
 
 // ─────────────────────────────────────────────────────────────────────────────
 // Types
@@ -46,7 +51,7 @@ export function validateSignMessageContent(
 }
 
 /**
- * Validates sign_message length: max 1KB UTF-8 bytes per SEP-53.
+ * Validates sign_message length against SIGN_MESSAGE_MAX_BYTES (UTF-8 bytes).
  */
 export function validateSignMessageLength(
   message: string,
diff --git a/src/i18n/locales/en/translations.json b/src/i18n/locales/en/translations.json
index af0e19741..89df5d691 100644
--- a/src/i18n/locales/en/translations.json
+++ b/src/i18n/locales/en/translations.json
@@ -895,7 +895,7 @@
     "errorAuthEntryNetworkMismatch": "Authorization entry is for a different network",
     "errorAuthEntryAddressMismatch": "Authorization entry is bound to a different account",
     "errorEmptyMessage": "Cannot sign empty message",
-    "errorMessageTooLong": "Message too long (max 1KB)",
+    "errorMessageTooLong": "Message too long (max 10KB)",
     "errorSubmitting": "Failed to submit transaction",
     "errorRespondingRequest": "Failed to respond transaction request",
     "errorWrongNetwork": "Wrong Network",
diff --git a/src/i18n/locales/pt/translations.json b/src/i18n/locales/pt/translations.json
index 3f15659c3..5291d6478 100644
--- a/src/i18n/locales/pt/translations.json
+++ b/src/i18n/locales/pt/translations.json
@@ -858,7 +858,7 @@
     "errorAuthEntryNetworkMismatch": "A entrada de autorização é para uma rede diferente",
     "errorAuthEntryAddressMismatch": "A entrada de autorização está vinculada a uma conta diferente",
     "errorEmptyMessage": "Não é possível assinar mensagem vazia",
-    "errorMessageTooLong": "Mensagem muito longa (máximo 1KB)",
+    "errorMessageTooLong": "Mensagem muito longa (máximo 10KB)",
     "errorSubmitting": "Erro ao enviar a transação",
     "errorRespondingRequest": "Erro ao responder à solicitação de transação",
     "errorWrongNetwork": "Rede incorreta",
diff --git a/src/providers/WalletKitProvider.tsx b/src/providers/WalletKitProvider.tsx
index c216380de..20666ff4f 100644
--- a/src/providers/WalletKitProvider.tsx
+++ b/src/providers/WalletKitProvider.tsx
@@ -724,7 +724,7 @@ export const WalletKitProvider: React.FC<WalletKitProviderProps> = ({
       return false;
     }
 
-    // Step 2: Validate message length (1KB limit per SEP-53)
+    // Step 2: Validate message length (sanity cap; SEP-53 imposes no limit)
     const lengthResult = validateSignMessageLength(contentResult.value);
     if (!lengthResult.valid) {
       showToast({