diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb686925f..ff7babd69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,19 +1,28 @@
 # CHANGELOG
 
-## master
+## 0.4.1 Jan 24, 2021
 
 Contributed:
 
 - Added polkadot-wallet.com (Thanks to https://github.com/FlorianFranzen)
+- Added 4dot.net, polkadots.network, polkadotwallet-unlock.org (Thanks to https://github.com/FlorianFranzen)
+- Added polkadotunlockwallet.com, polkadot.company (Thanks to https://github.com/FlorianFranzen)
+- Added dot4.org, getpolkadot.net (Thanks to https://github.com/FlorianFranzen)
+- Added dotevent.org, polkadot.center, polkadotlive.network (Thanks to https://github.com/FlorianFranzen)
+- Added polkadot.express (Thanks to https://github.com/laboon)
+- Added polkadot-airdrop.org, polkadot-live.online, walletsynchronization.com (Thanks to https://github.com/jackesky)
 
 Changes:
 
-- Added polkadot-airdrop.live
-- Added polkadotfund.com
+- Add `checkAddress` function to check addresses
 - Add test for sites with www prefix
 - Sort sites as part of the pre-publish build
+- Add duplicate check on CI
+- Add address.json for list of known addresses
 - Add urlmeta.json for extended info
 - Add index.html for table display from meta
+- Added polkadot-airdrop.live
+- Added polkadotfund.com
 
 
 ## 0.3.1 Dec 13, 2020
diff --git a/package.json b/package.json
index 930628468..2c4e288c6 100644
--- a/package.json
+++ b/package.json
@@ -24,5 +24,5 @@
     "@polkadot/dev": "^0.61.24",
     "@types/jest": "^26.0.20"
   },
-  "version": "0.3.25"
+  "version": "0.4.0"
 }
diff --git a/packages/phishing/package.json b/packages/phishing/package.json
index 047e4094e..a5c015075 100644
--- a/packages/phishing/package.json
+++ b/packages/phishing/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/phishing",
-  "version": "0.3.25",
+  "version": "0.4.0",
   "description": "Simple phishing scripts from a central source",
   "main": "index.js",
   "module": "index.mjs",
@@ -14,9 +14,9 @@
   "homepage": "https://github.com/polkadot-js/common/tree/master/packages/phishing#readme",
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "@polkadot/util": "^5.3.2-8",
-    "@polkadot/util-crypto": "^5.3.2-8",
-    "@polkadot/x-fetch": "^5.3.2-8"
+    "@polkadot/util": "^5.4.1",
+    "@polkadot/util-crypto": "^5.4.1",
+    "@polkadot/x-fetch": "^5.4.1"
   },
   "devDependencies": {
     "@types/js-yaml": "^4.0.0",
diff --git a/packages/unused/package.json b/packages/unused/package.json
index 1611e816b..22511f2fd 100644
--- a/packages/unused/package.json
+++ b/packages/unused/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@polkadot/unused",
-  "version": "0.3.25",
+  "version": "0.4.0",
   "description": "Dummy",
   "main": "index.js",
   "author": "Jaco Greeff <jacogr@gmail.com>",
diff --git a/scripts/sortAll.mjs b/scripts/sortAll.mjs
index 0a1a61b01..2d0c490ab 100644
--- a/scripts/sortAll.mjs
+++ b/scripts/sortAll.mjs
@@ -15,6 +15,20 @@ function sortAddress (values) {
     .reduce((all, [key, addresses]) => ({ ...all, [key]: addresses }), {});
 }
 
+function isUnique (type, list) {
+  const others = [];
+
+  list.forEach((entry) => {
+    if (others.includes(entry)) {
+      throw new Error(`${entry} is duplicated in ${type}`);
+    } else {
+      others.push(entry);
+    }
+  });
+
+  return true;
+}
+
 const addr = JSON.parse(fs.readFileSync('address.json', 'utf-8'));
 const all = JSON.parse(fs.readFileSync('all.json', 'utf-8'));
 const meta = JSON.parse(fs.readFileSync('urlmeta.json', 'utf-8'));
@@ -23,6 +37,11 @@ const meta = JSON.parse(fs.readFileSync('urlmeta.json', 'utf-8'));
 const allow = sortSection(all.allow);
 const deny = sortSection(all.deny);
 
+// check for unique entries
+isUnique('all.json/allow', allow);
+isUnique('all.json/deny', deny);
+isUnique('address.json', Object.keys(addr));
+
 // rewrite with all our entries (newline included)
 fs.writeFileSync('address.json', `${JSON.stringify(sortAddress(addr), null, 2)}\n`);
 fs.writeFileSync('all.json', `${JSON.stringify({ allow, deny }, null, 2)}\n`);
diff --git a/yarn.lock b/yarn.lock
index 31f854f0e..1b4af6da0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1708,12 +1708,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/networks@npm:5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/networks@npm:5.3.2-8"
+"@polkadot/networks@npm:5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/networks@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: 227a5730193f059171d0840f7c6852ce2f28fb7d41e4efe0ca400faaf73798b3c1c7ac3f5a0243f984058b1758e6d2295066e358c5f17b1971ef773ccbb2b8c5
+  checksum: eb408c956c45d8f0b9808e5507a9d82baacf0a266545eb3aaa8ac41b4821497c257f062a4f7235ea39ef6aa911d0bbfadffc510c920c76e5dc49f290a2fcd50a
   languageName: node
   linkType: hard
 
@@ -1722,9 +1722,9 @@ __metadata:
   resolution: "@polkadot/phishing@workspace:packages/phishing"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/util": ^5.3.2-8
-    "@polkadot/util-crypto": ^5.3.2-8
-    "@polkadot/x-fetch": ^5.3.2-8
+    "@polkadot/util": ^5.4.1
+    "@polkadot/util-crypto": ^5.4.1
+    "@polkadot/x-fetch": ^5.4.1
     "@types/js-yaml": ^4.0.0
     js-yaml: ^4.0.0
   languageName: unknown
@@ -1736,15 +1736,15 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@polkadot/util-crypto@npm:^5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/util-crypto@npm:5.3.2-8"
+"@polkadot/util-crypto@npm:^5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/util-crypto@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/networks": 5.3.2-8
-    "@polkadot/util": 5.3.2-8
+    "@polkadot/networks": 5.4.1
+    "@polkadot/util": 5.4.1
     "@polkadot/wasm-crypto": ^3.2.1
-    "@polkadot/x-randomvalues": 5.3.2-8
+    "@polkadot/x-randomvalues": 5.4.1
     base-x: ^3.0.8
     blakejs: ^1.1.0
     bn.js: ^4.11.9
@@ -1756,23 +1756,23 @@ __metadata:
     tweetnacl: ^1.0.3
     xxhashjs: ^0.2.2
   peerDependencies:
-    "@polkadot/util": 5.3.2-8
-  checksum: d513ff19f654cf7ba151f6e3173e3e7f65d22b6589d448534aeb551c3e94d5eab13ae521c407a58689a29fe6663b746f4b4eeb5679625d09d3a2b890ae6e682c
+    "@polkadot/util": 5.4.1
+  checksum: 8c69e90c945164d510b310e428f79afed3a6ddd2d3132762fc4021239ee61c125bf30e84b008b580515a79e42bfdbcd3dfbb974da34633418157af71f5184c15
   languageName: node
   linkType: hard
 
-"@polkadot/util@npm:5.3.2-8, @polkadot/util@npm:^5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/util@npm:5.3.2-8"
+"@polkadot/util@npm:5.4.1, @polkadot/util@npm:^5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/util@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/x-textdecoder": 5.3.2-8
-    "@polkadot/x-textencoder": 5.3.2-8
+    "@polkadot/x-textdecoder": 5.4.1
+    "@polkadot/x-textencoder": 5.4.1
     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
     camelcase: ^5.3.1
-    ip-regex: ^4.2.0
-  checksum: 897a87d1bf3d658ca840e1d63f2f3848ce42bc859a829c88012847ffc389c72f47202d4c678ee79f1eac5f99dac1f09e08809f3da5c6356fc6f5ddb653346d3d
+    ip-regex: ^4.3.0
+  checksum: c477c023e73cf9797a8c3274f296abf4ab3e7f64fba4c799adb61b49197d022ac53b242f1cc5acc43666f8b1e2c898c398c0f074239083cc3ead289058ecb8e6
   languageName: node
   linkType: hard
 
@@ -1808,41 +1808,41 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/x-fetch@npm:^5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/x-fetch@npm:5.3.2-8"
+"@polkadot/x-fetch@npm:^5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/x-fetch@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
     "@types/node-fetch": ^2.5.8
     node-fetch: ^2.6.1
-  checksum: e6207996cfafb6e64508347194a1c0f2d56c52e0892b41bee0e9e2c73c60fc3688cf55d29f88ef32ee8942dbd5646f093b4ff904454b0a0f28361fedececfa6f
+  checksum: 27a03ab3e596bbd20b54f46d2ecdb35a6c18a09968509afe6c9cedcff8f451d5b83e1b239ef485911d0d8a7699baa967f1702381240a88d00749a399bbd05a53
   languageName: node
   linkType: hard
 
-"@polkadot/x-randomvalues@npm:5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/x-randomvalues@npm:5.3.2-8"
+"@polkadot/x-randomvalues@npm:5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/x-randomvalues@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: dd1db83d18422b48a9fc3051ef4a3ec55ff6cf61f4ef69c723149526ca002bec314867a624c3db994fc838122eafe3d4730e20a5d262cf236454228a33b515d9
+  checksum: 3d843ee29f907c81046a35b706a60d5e0cf09914ba909f9c1bd92b57abb68af42378fdb9aed71e1bfaa20b082d675c133943c2306e5d96be0d25c10f98939f98
   languageName: node
   linkType: hard
 
-"@polkadot/x-textdecoder@npm:5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/x-textdecoder@npm:5.3.2-8"
+"@polkadot/x-textdecoder@npm:5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/x-textdecoder@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: afe2dbb5702f95d7e054bdbdf801a943debd73b0a77d1ffd856adcf80dd41fc7f1530b6c3910b24ba67442f958d2366d57cabb233c15618eba4bc115569021ad
+  checksum: c5a2d2366388ddd837553ad6f990589cfad5f8d25a16d6c1857b6c454a9c9ce7e53d52d71776f521f9ba7e03d7fd2275cb54c85468440a750c03cf7720573cb2
   languageName: node
   linkType: hard
 
-"@polkadot/x-textencoder@npm:5.3.2-8":
-  version: 5.3.2-8
-  resolution: "@polkadot/x-textencoder@npm:5.3.2-8"
+"@polkadot/x-textencoder@npm:5.4.1":
+  version: 5.4.1
+  resolution: "@polkadot/x-textencoder@npm:5.4.1"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: 0b81d1c412442f85f529f14690af47acfe920c011622705803683b3f4ddf005935e41757238f7faf6551c50729f38e67128f00838d6b90e9eed87b83199ded99
+  checksum: 3a3277d7fe33114059d714b63960f4b0ccabc03e4ea0f30fd11be0b137ccf828fb3662567f5f657ff51649ec7bd1288977333b51811eb6bb9432a0de90fc0216
   languageName: node
   linkType: hard
 
@@ -5592,10 +5592,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ip-regex@npm:^4.2.0":
-  version: 4.2.0
-  resolution: "ip-regex@npm:4.2.0"
-  checksum: 9e376018e64da89756e27d3f1b3313abc85291b5d1b5b9878f26b3934ecb04fa512116bf66b6dcd9553ba0b88af4feaaedbccd86f0ba6c05e464642ccb8504c5
+"ip-regex@npm:^4.3.0":
+  version: 4.3.0
+  resolution: "ip-regex@npm:4.3.0"
+  checksum: 4f44f34dcfe5cfae3b79bac4b25bec81ea007c24a66a30a3a17d01eebde4fa98bb531f207590ee16e1e4721b4f8ad12f6a64ed9f49bcb4587ff13ebb7cc984a5
   languageName: node
   linkType: hard