Specially Designated Nationals and Blocked Persons Ethereum addresses

src/components/Blocklist/index.tsx

+import React, { ReactNode, useMemo } from 'react'
+import { BLOCKED_ADDRESSES } from '../../constants'
+import { useActiveWeb3React } from '../../hooks'
+
+export default function Blocklist({ children }: { children: ReactNode }) {
+  const { account } = useActiveWeb3React()
+  const blocked: boolean = useMemo(() => Boolean(account && BLOCKED_ADDRESSES.indexOf(account) !== -1), [account])
+  if (blocked) {
+    return <div>Blocked address</div>
+  }
+  return <>{children}</>
+}

src/constants/index.ts

@@ -199,3 +199,11 @@ export const BLOCKED_PRICE_IMPACT_NON_EXPERT: Percent = new Percent(JSBI.BigInt(
 // used to ensure the user doesn't send so much ETH so they end up with <.01
 export const MIN_ETH: JSBI = JSBI.exponentiate(JSBI.BigInt(10), JSBI.BigInt(16)) // .01 ETH
 export const BETTER_TRADE_LINK_THRESHOLD = new Percent(JSBI.BigInt(75), JSBI.BigInt(10000))
+
+// SDN OFAC addresses
+export const BLOCKED_ADDRESSES: string[] = [
+  '0x7F367cC41522cE07553e823bf3be79A889DEbe1B',
+  '0xd882cFc20F52f2599D84b8e8D58C7FB62cfE344b',
+  '0x901bb9583b24D97e995513C6778dc6888AB6870e',
+  '0xA7e5d5A720f06526557c513402f2e6B5fA20b008'
+]

src/index.tsx

@@ -6,6 +6,7 @@ import ReactDOM from 'react-dom'
 import ReactGA from 'react-ga'
 import { Provider } from 'react-redux'
 import { HashRouter } from 'react-router-dom'
+import Blocklist from './components/Blocklist'
 import { NetworkContextName } from './constants'
 import './i18n'
 import App from './pages/App'
@@ -58,15 +59,17 @@ ReactDOM.render(
     <FixedGlobalStyle />
     <Web3ReactProvider getLibrary={getLibrary}>
       <Web3ProviderNetwork getLibrary={getLibrary}>
-        <Provider store={store}>
-          <Updaters />
-          <ThemeProvider>
-            <ThemedGlobalStyle />
-            <HashRouter>
-              <App />
-            </HashRouter>
-          </ThemeProvider>
-        </Provider>
+        <Blocklist>
+          <Provider store={store}>
+            <Updaters />
+            <ThemeProvider>
+              <ThemedGlobalStyle />
+              <HashRouter>
+                <App />
+              </HashRouter>
+            </ThemeProvider>
+          </Provider>
+        </Blocklist>
       </Web3ProviderNetwork>
     </Web3ReactProvider>
   </StrictMode>,