diff --git a/package-lock.json b/package-lock.json
index 354212d..b3c5dd7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,6 +14,7 @@
       "dependencies": {
         "@radix-ui/react-switch": "^1.2.6",
         "@tanstack/react-query": "^5.62.0",
+        "bitcoinjs-lib": "^7.0.1",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "lucide-react": "^0.468.0",
@@ -21,6 +22,7 @@
         "react-dom": "^18.3.1",
         "recharts": "^2.14.1",
         "tailwind-merge": "^2.6.0",
+        "tiny-secp256k1": "^2.2.4",
         "wouter": "^3.3.5"
       },
       "devDependencies": {
@@ -38,7 +40,9 @@
         "tailwindcss": "^3.4.17",
         "typescript": "^5.7.2",
         "typescript-eslint": "^8.56.1",
-        "vite": "^6.0.3"
+        "vite": "^6.0.3",
+        "vite-plugin-top-level-await": "^1.6.0",
+        "vite-plugin-wasm": "^3.6.0"
       }
     },
     "node_modules/@alloc/quick-lru": {
@@ -1098,6 +1102,18 @@
         "url": "https://opencollective.com/js-sdsl"
       }
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+    "node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
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       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -1398,6 +1414,24 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@rollup/plugin-virtual": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-virtual/-/plugin-virtual-3.0.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      },
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+      },
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+        }
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@@ -1748,6 +1782,275 @@
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+      "funding": {
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+        "url": "https://opencollective.com/swc"
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+      "resolved": "https://registry.npmjs.org/@swc/counter/-/counter-0.1.3.tgz",
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+      "license": "Apache-2.0"
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+      "version": "0.1.26",
+      "resolved": "https://registry.npmjs.org/@swc/types/-/types-0.1.26.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
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+      }
+    },
+    "node_modules/@swc/wasm": {
+      "version": "1.15.21",
+      "resolved": "https://registry.npmjs.org/@swc/wasm/-/wasm-1.15.21.tgz",
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+      "license": "Apache-2.0"
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       "version": "5.90.19",
       "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.90.19.tgz",
@@ -2588,6 +2891,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/base-x": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-5.0.1.tgz",
+      "integrity": "sha512-M7uio8Zt++eg3jPj+rHMfCC+IuygQHHCOU+IYsVtik6FWjuYpVt/+MRKcgsAMHh8mMFAwnB+Bs+mTrFiXjMzKg==",
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+    },
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@@ -2627,6 +2936,12 @@
         "tweetnacl": "^0.14.3"
       }
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+    "node_modules/bech32": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/bech32/-/bech32-2.0.0.tgz",
+      "integrity": "sha512-LcknSilhIGatDAsY1ak2I8VtGaHNhgMSYVxFrGLXv+xLHytaKZKcaUJJUE7qmBr7h33o5YQwP55pMI0xmkpJwg==",
+      "license": "MIT"
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@@ -2640,6 +2955,37 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/bip174": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/bip174/-/bip174-3.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "uint8array-tools": "^0.0.9",
+        "varuint-bitcoin": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
+    "node_modules/bitcoinjs-lib": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/bitcoinjs-lib/-/bitcoinjs-lib-7.0.1.tgz",
+      "integrity": "sha512-vwEmpL5Tpj0I0RBdNkcDMXePoaYSTeKY6mL6/l5esbnTs+jGdPDuLp4NY1hSh6Zk5wSgePygZ4Wx5JJao30Pww==",
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "^1.2.0",
+        "bech32": "^2.0.0",
+        "bip174": "^3.0.0",
+        "bs58check": "^4.0.0",
+        "uint8array-tools": "^0.0.9",
+        "valibot": "^1.2.0",
+        "varuint-bitcoin": "^2.0.0"
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@@ -2748,6 +3094,25 @@
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+      "license": "MIT",
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+      "resolved": "https://registry.npmjs.org/bs58check/-/bs58check-4.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/tiny-secp256k1/-/tiny-secp256k1-2.2.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      },
+      "engines": {
+        "node": ">=14.0.0"
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+      "resolved": "https://registry.npmjs.org/uint8array-tools/-/uint8array-tools-0.0.7.tgz",
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@@ -6660,7 +7046,7 @@
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-      "dev": true,
+      "devOptional": true,
       "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
@@ -6694,6 +7080,15 @@
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       }
     },
+    "node_modules/uint8array-tools": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/uint8array-tools/-/uint8array-tools-0.0.9.tgz",
+      "integrity": "sha512-9vqDWmoSXOoi+K14zNaf6LBV51Q8MayF0/IiQs3GlygIKUYtog603e6virExkjjFosfJUBI4LhbQK1iq8IG11A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
@@ -6787,6 +7182,38 @@
         "uuid": "dist/bin/uuid"
       }
     },
+    "node_modules/valibot": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/valibot/-/valibot-1.3.1.tgz",
+      "integrity": "sha512-sfdRir/QFM0JaF22hqTroPc5xy4DimuGQVKFrzF1YfGwaS1nJot3Y8VqMdLO2Lg27fMzat2yD3pY5PbAYO39Gg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "typescript": ">=5"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/varuint-bitcoin": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/varuint-bitcoin/-/varuint-bitcoin-2.0.0.tgz",
+      "integrity": "sha512-6QZbU/rHO2ZQYpWFDALCDSRsXbAs1VOEmXAxtbtjLtKuMJ/FQ8YbhfxlaiKv5nklci0M6lZtlZyxo9Q+qNnyog==",
+      "license": "MIT",
+      "dependencies": {
+        "uint8array-tools": "^0.0.8"
+      }
+    },
+    "node_modules/varuint-bitcoin/node_modules/uint8array-tools": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/uint8array-tools/-/uint8array-tools-0.0.8.tgz",
+      "integrity": "sha512-xS6+s8e0Xbx++5/0L+yyexukU7pz//Yg6IHg3BKhXotg1JcYtgxVcUctQ0HxLByiJzpAkNFawz1Nz5Xadzo82g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -6893,6 +7320,32 @@
         }
       }
     },
+    "node_modules/vite-plugin-top-level-await": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/vite-plugin-top-level-await/-/vite-plugin-top-level-await-1.6.0.tgz",
+      "integrity": "sha512-bNhUreLamTIkoulCR9aDXbTbhLk6n1YE8NJUTTxl5RYskNRtzOR0ASzSjBVRtNdjIfngDXo11qOsybGLNsrdww==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@rollup/plugin-virtual": "^3.0.2",
+        "@swc/core": "^1.12.14",
+        "@swc/wasm": "^1.12.14",
+        "uuid": "10.0.0"
+      },
+      "peerDependencies": {
+        "vite": ">=2.8"
+      }
+    },
+    "node_modules/vite-plugin-wasm": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/vite-plugin-wasm/-/vite-plugin-wasm-3.6.0.tgz",
+      "integrity": "sha512-mL/QPziiIA4RAA6DkaZZzOstdwbW5jO4Vz7Zenj0wieKWBlNvIvX5L5ljum9lcUX0ShNfBgCNLKTjNkRVVqcsw==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "vite": "^2 || ^3 || ^4 || ^5 || ^6 || ^7 || ^8"
+      }
+    },
     "node_modules/vite/node_modules/fdir": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
diff --git a/package.json b/package.json
index e7b5343..db8ac0c 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
   "dependencies": {
     "@radix-ui/react-switch": "^1.2.6",
     "@tanstack/react-query": "^5.62.0",
+    "bitcoinjs-lib": "^7.0.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "^0.468.0",
@@ -28,6 +29,7 @@
     "react-dom": "^18.3.1",
     "recharts": "^2.14.1",
     "tailwind-merge": "^2.6.0",
+    "tiny-secp256k1": "^2.2.4",
     "wouter": "^3.3.5"
   },
   "devDependencies": {
@@ -45,7 +47,9 @@
     "tailwindcss": "^3.4.17",
     "typescript": "^5.7.2",
     "typescript-eslint": "^8.56.1",
-    "vite": "^6.0.3"
+    "vite": "^6.0.3",
+    "vite-plugin-top-level-await": "^1.6.0",
+    "vite-plugin-wasm": "^3.6.0"
   },
   "repository": {
     "type": "git",
diff --git a/src/components/setup/steps/JdcConfigStep.tsx b/src/components/setup/steps/JdcConfigStep.tsx
index 3990fed..0ac5e96 100644
--- a/src/components/setup/steps/JdcConfigStep.tsx
+++ b/src/components/setup/steps/JdcConfigStep.tsx
@@ -1,6 +1,7 @@
 import { useState, useEffect } from 'react';
 import { StepProps, JdcConfig } from '../types';
 import { Info } from 'lucide-react';
+import { isValidBitcoinAddress, getBitcoinAddressError } from '@/lib/utils';
 
 export function JdcConfigStep({ data, updateData, onNext }: StepProps) {
   const [config, setConfig] = useState<JdcConfig>(
@@ -19,9 +20,11 @@ export function JdcConfigStep({ data, updateData, onNext }: StepProps) {
     setConfig({ ...config, [field]: value });
   };
 
-  const isValid = 
-    config.user_identity.length > 0 && 
-    config.coinbase_reward_address.length > 0;
+  const network = data.bitcoin?.network ?? 'mainnet';
+
+  const isValid =
+    config.user_identity.length > 0 &&
+    isValidBitcoinAddress(config.coinbase_reward_address, network);
 
   return (
     <div className="space-y-8">
@@ -82,6 +85,9 @@ export function JdcConfigStep({ data, updateData, onNext }: StepProps) {
             autoComplete="off"
             className="w-full h-10 px-3 rounded-lg border border-input bg-background font-mono text-sm focus-visible:border-primary focus-visible:ring-2 focus-visible:ring-primary/15 outline-none transition-all"
           />
+          {getBitcoinAddressError(config.coinbase_reward_address, network) && (
+            <p className="text-xs text-destructive mt-1">{getBitcoinAddressError(config.coinbase_reward_address, network)}</p>
+          )}
           <p className="text-xs text-muted-foreground mt-2">
             Bitcoin address for receiving mining rewards (fallback for solo mining)
           </p>
diff --git a/src/components/setup/steps/MiningIdentityStep.tsx b/src/components/setup/steps/MiningIdentityStep.tsx
index 05fcf2d..620fc79 100644
--- a/src/components/setup/steps/MiningIdentityStep.tsx
+++ b/src/components/setup/steps/MiningIdentityStep.tsx
@@ -1,6 +1,7 @@
 import { useState, useEffect } from 'react';
 import { StepProps } from '../types';
 import { Info } from 'lucide-react';
+import { isValidBitcoinAddress, getBitcoinAddressError } from '@/lib/utils';
 
 export function MiningIdentityStep({ data, updateData, onNext }: StepProps) {
   const isSoloMode = data.miningMode === 'solo';
@@ -22,7 +23,12 @@ export function MiningIdentityStep({ data, updateData, onNext }: StepProps) {
     });
   }, [userIdentity, coinbaseAddress, isJdMode, data.jdc?.jdc_signature, data.translator, updateData]);
 
-  const isValid = userIdentity.length > 0 && (!isJdMode || coinbaseAddress.length > 0);
+  const network = data.bitcoin?.network ?? 'mainnet';
+
+  const isValid =
+    userIdentity.length > 0 &&
+    (!isSoloMode || isValidBitcoinAddress(userIdentity, network)) &&
+    (!isJdMode || isValidBitcoinAddress(coinbaseAddress, network));
 
   return (
     <div className="space-y-8">
@@ -48,6 +54,9 @@ export function MiningIdentityStep({ data, updateData, onNext }: StepProps) {
           autoComplete="off"
           className="w-full h-10 px-3 rounded-lg border border-input bg-background focus-visible:border-primary focus-visible:ring-2 focus-visible:ring-primary/15 outline-none transition-all font-mono text-sm"
         />
+        {isSoloMode && getBitcoinAddressError(userIdentity, network) && (
+          <p className="text-xs text-destructive mt-1">{getBitcoinAddressError(userIdentity, network)}</p>
+        )}
         <p className="text-xs text-muted-foreground mt-2">
           {isSoloMode
             ? 'Your Bitcoin address where you want to receive mining rewards'
@@ -79,6 +88,9 @@ export function MiningIdentityStep({ data, updateData, onNext }: StepProps) {
             autoComplete="off"
             className="w-full h-10 px-3 rounded-lg border border-input bg-background focus-visible:border-primary focus-visible:ring-2 focus-visible:ring-primary/15 outline-none transition-all font-mono text-sm"
           />
+          {getBitcoinAddressError(coinbaseAddress, network) && (
+            <p className="text-xs text-destructive mt-1">{getBitcoinAddressError(coinbaseAddress, network)}</p>
+          )}
           <p className="text-xs text-muted-foreground mt-2">
             Bitcoin address for receiving rewards during solo mining fallback
           </p>
diff --git a/src/components/setup/steps/TranslatorConfigStep.tsx b/src/components/setup/steps/TranslatorConfigStep.tsx
index 918d6a6..cd4f457 100644
--- a/src/components/setup/steps/TranslatorConfigStep.tsx
+++ b/src/components/setup/steps/TranslatorConfigStep.tsx
@@ -3,6 +3,7 @@ import { StepProps, TranslatorConfig } from '../types';
 import { Switch } from '@/components/ui/switch';
 import { Info } from 'lucide-react';
 import { TRANSLATOR_PORT } from '@/lib/ports';
+import { isValidBitcoinAddress, getBitcoinAddressError } from '@/lib/utils';
 
 export function TranslatorConfigStep({ data, updateData, onNext }: StepProps) {
   const isSoloMode = data.miningMode === 'solo';
@@ -24,7 +25,11 @@ export function TranslatorConfigStep({ data, updateData, onNext }: StepProps) {
     setConfig({ ...config, [field]: value });
   };
 
-  const isValid = config.user_identity.length > 0;
+  const network = data.bitcoin?.network ?? 'mainnet';
+
+  const isValid = isSoloMode
+    ? isValidBitcoinAddress(config.user_identity, network)
+    : config.user_identity.length > 0;
 
   const getUserIdentityLabel = () => {
     if (isSoloMode) {
@@ -86,6 +91,9 @@ export function TranslatorConfigStep({ data, updateData, onNext }: StepProps) {
             autoComplete="off"
             className="w-full h-10 px-3 rounded-lg border border-input bg-background focus-visible:border-primary focus-visible:ring-2 focus-visible:ring-primary/15 outline-none transition-all font-mono text-sm"
           />
+          {isSoloMode && getBitcoinAddressError(config.user_identity, network) && (
+            <p className="text-xs text-destructive mt-1">{getBitcoinAddressError(config.user_identity, network)}</p>
+          )}
           <p className="text-xs text-muted-foreground mt-2">
             {getUserIdentityDescription()}
           </p>
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index 5b9c809..afb700d 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -1,5 +1,10 @@
 import { type ClassValue, clsx } from 'clsx';
 import { twMerge } from 'tailwind-merge';
+import * as bitcoin from 'bitcoinjs-lib';
+import * as ecc from 'tiny-secp256k1';
+
+// Required for taproot (P2TR) address validation
+bitcoin.initEccLib(ecc);
 
 /**
  * Combines class names with Tailwind merge support.
@@ -79,3 +84,28 @@ export function calculateSharesPerMinute(shares: number, uptimeSecs: number): nu
   if (uptimeSecs === 0) return 0;
   return (shares / uptimeSecs) * 60;
 }
+
+/**
+ * Validates a Bitcoin address against the specified network.
+ * Supports P2PKH, P2SH, P2WPKH, P2WSH, and P2TR address formats.
+ */
+export function isValidBitcoinAddress(addr: string, network: 'mainnet' | 'testnet4'): boolean {
+  if (!addr) return false;
+  const btcNetwork = network === 'mainnet' ? bitcoin.networks.bitcoin : bitcoin.networks.testnet;
+  try {
+    bitcoin.address.toOutputScript(addr, btcNetwork);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Returns an error message if the address is invalid for the given network,
+ * distinguishing between a wrong network address and a completely invalid one.
+ */
+export function getBitcoinAddressError(addr: string, network: 'mainnet' | 'testnet4'): string | null {
+  if (!addr || isValidBitcoinAddress(addr, network)) return null;
+  const otherNetwork = network === 'mainnet' ? 'testnet4' : 'mainnet';
+  return isValidBitcoinAddress(addr, otherNetwork) ? 'Wrong network' : 'Invalid Bitcoin address';
+}
diff --git a/vite.config.ts b/vite.config.ts
index 60019fc..c00a6f8 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,10 +1,12 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
+import wasm from 'vite-plugin-wasm';
+import topLevelAwait from 'vite-plugin-top-level-await';
 import path from 'path';
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [wasm(), topLevelAwait(), react()],
   resolve: {
     alias: {
       '@': path.resolve(__dirname, './src'),