fix(faucet): isValidAddress should accept all bech32 addresses

- check length based on Bech32 from [BIP173](https://github.com/bitcoin/bips/blob/e1e7b77c027b3d40d07d306cc75c2b5859c91db2/bip-0173.mediawiki#bech32)

packages/faucet/src/addresses.spec.ts

@@ -0,0 +1,20 @@
+import { isValidAddress } from "./addresses";
+
+describe("isValidAddress", () => {
+  it("accepts account address", () => {
+    expect(isValidAddress('cosmos1h806c7khnvmjlywdrkdgk2vrayy2mmvf9rxk2r', 'cosmos')).toBe(true);
+  });
+
+  it("accepts an ics-27 address", () => {
+    expect(isValidAddress('osmo1d6em9ea5y3dye6em0awqyss7ssp0a7sgjk792x8cx647cfs7a4msk0fr45', 'osmo')).toBe(true);
+  });
+
+  it("rejects an invalid address", () => {
+    expect(isValidAddress('cosmos1fail', 'cosmos')).toBe(false);
+  });
+
+  it("requires a prefix argument", () => {
+    // @ts-expect-error intentionally omitting an argument
+    expect(isValidAddress('cosmos1h806c7khnvmjlywdrkdgk2vrayy2mmvf9rxk2r')).toBe(false);
+  });
+});

packages/faucet/src/addresses.ts

@@ -1,12 +1,17 @@
 import { fromBech32 } from "@cosmjs/encoding";
 
+/**
+ * Check length based on Bech32 from {@link https://github.com/bitcoin/bips/blob/e1e7b77c027b3d40d07d306cc75c2b5859c91db2/bip-0173.mediawiki#bech32 | BIP173}
+ */ 
 export function isValidAddress(input: string, requiredPrefix: string): boolean {
   try {
     const { prefix, data } = fromBech32(input);
-    if (prefix !== requiredPrefix) {
-      return false;
-    }
-    return data.length === 20;
+    return (
+      prefix === requiredPrefix &&
+      input.length >= 8 &&
+      input.length <= 90 &&
+      data.length >= 4 // 6 chars = 30 bits (3.75 bytes), rounded to whole byte
+    );
   } catch {
     return false;
   }