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/decode.ts

@@ -0,0 +1,41 @@
+// Copyright 2017-2025 @polkadot/util-crypto authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { Prefix } from './types.js';
+
+// Original implementation: https://github.com/paritytech/polka-ui/blob/4858c094684769080f5811f32b081dd7780b0880/src/polkadot.js#L6
+import { isHex, isU8a, u8aToU8a } from '@pezkuwi/util';
+
+import { base58Decode } from '../base58/index.js';
+import { checkAddressChecksum } from './checksum.js';
+import { defaults } from './defaults.js';
+
+export function decodeAddress (encoded?: string | Uint8Array | null, ignoreChecksum?: boolean, ss58Format: Prefix = -1): Uint8Array {
+  if (!encoded) {
+    throw new Error('Invalid empty address passed');
+  }
+
+  if (isU8a(encoded) || isHex(encoded)) {
+    return u8aToU8a(encoded);
+  }
+
+  try {
+    const decoded = base58Decode(encoded);
+
+    if (!defaults.allowedEncodedLengths.includes(decoded.length)) {
+      throw new Error('Invalid decoded address length');
+    }
+
+    const [isValid, endPos, ss58Length, ss58Decoded] = checkAddressChecksum(decoded);
+
+    if (!isValid && !ignoreChecksum) {
+      throw new Error('Invalid decoded address checksum');
+    } else if (ss58Format !== -1 && ss58Format !== ss58Decoded) {
+      throw new Error(`Expected ss58Format ${ss58Format}, received ${ss58Decoded}`);
+    }
+
+    return decoded.slice(ss58Length, endPos);
+  } catch (error) {
+    throw new Error(`Decoding ${encoded}: ${(error as Error).message}`);
+  }
+}