Initial rebrand: @polkadot -> @pezkuwi (14 packages)

- Package namespace: @polkadot/* -> @pezkuwi/*
- Repository: polkadot-js/common -> pezkuwichain/pezkuwi-common
- Author: Pezkuwi Team <team@pezkuwichain.io>

Core packages:
- @pezkuwi/util (utilities)
- @pezkuwi/util-crypto (crypto primitives)
- @pezkuwi/keyring (account management)
- @pezkuwi/networks (chain metadata)
- @pezkuwi/hw-ledger (Ledger hardware wallet)
- @pezkuwi/x-* (10 polyfill packages)

Total: 14 packages
Upstream: polkadot-js/common v14.0.1

packages/util-crypto/src/address/check.spec.ts

@@ -0,0 +1,44 @@
+// Copyright 2017-2025 @polkadot/util-crypto authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { checkAddress } from './index.js';
+
+describe('checkAddress', (): void => {
+  it('returns [true, null] for Kusama', (): void => {
+    expect(
+      checkAddress('FJaco77EJ99VtBmVFibuBJR3x5Qq9KQrgQJvWjqScCcCCae', 2)
+    ).toEqual([true, null]);
+  });
+
+  it('returns [true, null] for Substrate', (): void => {
+    expect(
+      checkAddress('5EnxxUmEbw8DkENKiYuZ1DwQuMoB2UWEQJZZXrTsxoz7SpgG', 42)
+    ).toEqual([true, null]);
+  });
+
+  it('fails when an invalid base58 character is supplied', (): void => {
+    expect(
+      checkAddress('5EnxIUmEbw8DkENKiYuZ1DwQuMoB2UWEQJZZXrTsxoz7SpgG', 2)
+    ).toEqual([false, 'Invalid base58 character "I" (0x49) at index 4']);
+  });
+
+  it('fails with invalid prefix when checking Substrate against Kusama prefix', (): void => {
+    expect(
+      checkAddress('5EnxxUmEbw8DkENKiYuZ1DwQuMoB2UWEQJZZXrTsxoz7SpgG', 2)
+    ).toEqual([false, 'Prefix mismatch, expected 2, found 42']);
+  });
+
+  it('fails with invalid length when some bytes are missing', (): void => {
+    expect(
+      checkAddress('y9EMHt34JJo4rWLSaxoLGdYXvjgSXEd4zHUnQgfNzwES8b', 42)
+    ).toEqual([false, 'Invalid decoded address length']);
+  });
+
+  it('fails with invalid length on checksum mismatch', (): void => {
+    expect(
+      checkAddress('5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaDwU', 42)
+    ).toEqual([false, 'Invalid decoded address checksum']);
+  });
+});