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/checksum.spec.ts

@@ -0,0 +1,45 @@
+// Copyright 2017-2025 @polkadot/util-crypto authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { base58Decode } from '../base58/index.js';
+import { checkAddressChecksum } from './checksum.js';
+
+describe('checkAddressChecksum', (): void => {
+  it('correctly extracts the info from a 1-byte-prefix address', (): void => {
+    expect(
+      checkAddressChecksum(base58Decode('F3opxRbN5ZbjJNU511Kj2TLuzFcDq9BGduA9TgiECafpg29'))
+    ).toEqual([true, 33, 1, 2]);
+  });
+
+  it('correctly extracts the info from a 2-byte-prefix address (66)', (): void => {
+    expect(
+      checkAddressChecksum(base58Decode('cTGShekJ1L1UKFZR9xmv9UTJod7vqjFAPo4sDhXih2c3y1yLS'))
+    ).toEqual([true, 34, 2, 66]);
+  });
+
+  it('correctly extracts the info from a 2-byte-prefix address (69)', (): void => {
+    expect(
+      checkAddressChecksum(base58Decode('cnVvyMzRdqjwejTFuByQQ4w2yu78V2hpFixjHQz5zr6NSYsxA'))
+    ).toEqual([true, 34, 2, 69]);
+  });
+
+  it('correctly extracts the info from a 2-byte-prefix address (252)', (): void => {
+    expect(
+      checkAddressChecksum(base58Decode('xw8Ffc2SZtDqUJKd9Ky4vc7PRz2D2asuVkEEzf3WGAbw9cnfq'))
+    ).toEqual([true, 34, 2, 252]);
+  });
+
+  it('correctly extracts the info from a 2-byte-prefix address (255)', (): void => {
+    expect(
+      checkAddressChecksum(base58Decode('yGHU8YKprxHbHdEv7oUK4rzMZXtsdhcXVG2CAMyC9WhzhjH2k'))
+    ).toEqual([true, 34, 2, 255]);
+  });
+
+  it('correctly extracts the info from a 2-byte-prefix address (ecdsa, from Substrate)', (): void => {
+    expect(
+      checkAddressChecksum(base58Decode('4pbsSkWcBaYoFHrKJZp5fDVUKbqSYD9dhZZGvpp3vQ5ysVs5ybV'))
+    ).toEqual([true, 35, 2, 200]);
+  });
+});