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+# BIP322 Proof of Address Ownership
+
+## What is BIP322?
+
+[BIP322](https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki) (Bitcoin Improvement Proposal 322) is a standard for **generic message signing** in Bitcoin. It provides a way to cryptographically prove ownership of a Bitcoin address by signing an arbitrary message.
+
+Unlike the legacy message signing approach (which only worked with P2PKH addresses), BIP322 supports all standard Bitcoin address types including:
+- P2SH (Pay-to-Script-Hash)
+- P2SH-P2WSH (Nested SegWit)
+- P2WSH (Native SegWit)
+- P2TR (Taproot)
+
+## What is it used for?
+
+BIP322 proofs are commonly used for:
+
+1. **Proof of Reserves**: Exchanges and custodians can prove they control certain addresses without moving funds.
+
+2. **Address Verification**: Verify that a counterparty owns an address before sending funds to them.
+
+3. **Identity Verification**: Associate a Bitcoin address with an identity or account.
+
+4. **Audit Compliance**: Provide cryptographic evidence of address ownership for regulatory or audit purposes.
+
+5. **Dispute Resolution**: Prove ownership of funds in case of disputes.
+
+## How to Use This Example
+
+### Prerequisites
+
+1. A BitGo account with API access
+2. A **traditional multi-sig wallet** (NOT a descriptor wallet)
+3. At least one address created on the wallet
+4. Node.js and the BitGoJS SDK installed
+
+### Important Limitation
+
+> **WARNING**: This example does NOT work with descriptor wallets. Only use this with traditional BitGo multi-sig wallets that have keychains with standard derivation paths.
+
+### Step-by-Step Instructions
+
+1. **Configure the example** by editing `verifyProof.ts`:
+   ```typescript
+   // Set your environment: 'prod' for mainnet, 'test' for testnet
+   const environment: 'prod' | 'test' = 'test';
+   
+   // Set the coin: 'btc' for mainnet, 'tbtc4' for testnet
+   const coin = 'tbtc4';
+   
+   // Set your BitGo access token
+   const accessToken = 'YOUR_ACCESS_TOKEN';
+   
+   // Set your wallet ID
+   const walletId = 'YOUR_WALLET_ID';
+   
+   // Set your wallet passphrase
+   const walletPassphrase = 'YOUR_WALLET_PASSPHRASE';
+   ```
+
+2. **Edit `messages.json`** with the addresses and messages you want to prove:
+   ```json
+   [
+     {
+       "address": "tb1q...",
+       "message": "I own this address on 2025-02-02"
+     },
+     {
+       "address": "2N...",
+       "message": "Proof of ownership for audit"
+     }
+   ]
+   ```
+
+   Each entry must contain:
+   - `address`: A valid address that belongs to your wallet
+   - `message`: The arbitrary message to sign (can be any string)
+
+3. **Run the example**:
+   ```bash
+   cd examples/ts/btc/bip322
+   npx ts-node verifyProof.ts
+   ```
+
+### What the Example Does
+
+1. **Loads** the address/message pairs from `messages.json`
+2. **Fetches** the wallet and its keychains from BitGo
+3. **Gets address info** for each address to obtain the chain and index (needed for pubkey derivation)
+4. **Derives the script type** from the chain code (e.g., chain 10/11 = P2SH-P2WSH)
+5. **Derives the public keys** for each address using the wallet's keychains
+6. **Creates the BIP322 proof** by calling `wallet.sendMany()` with `type: 'bip322'`
+7. **Verifies the proof** using `bip322.assertBip322TxProof()` to ensure:
+   - The transaction structure follows BIP322 requirements
+   - The signatures are valid for the derived public keys
+   - The message is correctly encoded in the transaction
+
+### Expected Output
+
+```
+Environment: test
+Coin: tbtc4
+Wallet ID: abc123...
+
+Loaded 1 message(s) to prove:
+  1. Address: tb1q...
+     Message: I own this address
+
+Fetching wallet...
+Wallet label: My Test Wallet
+
+Fetching keychains...
+Retrieved wallet public keys
+
+Building message info from address data...
+  Getting address info for: tb1q...
+    Chain: 20, Index: 0, ScriptType: p2wsh
+
+Creating BIP322 proof via sendMany...
+BIP322 proof created successfully
+
+Verifying BIP322 proof...
+Transaction proof verified successfully!
+
+============================================
+BIP322 PROOF VERIFICATION COMPLETE
+============================================
+Verified 1 address/message pair(s):
+
+1. Address: tb1q...
+   Message: "I own this address"
+   Script Type: p2wsh
+
+All proofs are valid. The wallet controls the specified addresses.
+```
+
+## Chain Codes and Script Types
+
+BitGo uses chain codes to determine the address script type:
+
+| Chain Code | Address Type | Description |
+|------------|--------------|-------------|
+| 0, 1       | P2SH         | Legacy wrapped multi-sig |
+| 10, 11     | P2SH-P2WSH   | Nested SegWit (compatible) |
+| 20, 21     | P2WSH        | Native SegWit |
+| 30, 31     | P2TR         | Taproot script path |
+| 40, 41     | P2TR-Musig2  | Taproot key path (MuSig2) |
+
+Even chain codes (0, 10, 20, 30, 40) are for external/receive addresses.
+Odd chain codes (1, 11, 21, 31, 41) are for internal/change addresses.
+
+## Troubleshooting
+
+### "Address is missing chain or index information"
+The address may not belong to this wallet, or it may be from a descriptor wallet which is not supported.
+
+### "Expected 3 keychains for multi-sig wallet"
+Ensure you're using a traditional BitGo multi-sig wallet, not a TSS or descriptor wallet.
+
+### "No transaction hex found in sendMany result"
+The BIP322 proof request may have failed. Check the error details in the response.
+
+## References
+
+- [BIP322 Specification](https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki)
+- [BitGo API Documentation](https://developers.bitgo.com/)
+- [BitGoJS SDK](https://github.com/BitGo/BitGoJS)
diff --git a/examples/ts/btc/bip322/messages.json b/examples/ts/btc/bip322/messages.json
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+[
+  {
+    "address": "YOUR_WALLET_ADDRESS_HERE",
+    "message": "I own this address"
+  },
+  {
+    "address": "YOUR_OTHER_WALLET_ADDRESS_HERE",
+    "message": "I also own this address"
+  }
+]
diff --git a/examples/ts/btc/bip322/verifyProof.ts b/examples/ts/btc/bip322/verifyProof.ts
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+++ b/examples/ts/btc/bip322/verifyProof.ts
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+/**
+ * Verify a BIP322 proof of address ownership from a BitGo multi-sig wallet.
+ *
+ * This example demonstrates how to:
+ * 1. Get a wallet by ID
+ * 2. Read address/message pairs from messages.json
+ * 3. Get address information to obtain chain and index for pubkey derivation
+ * 4. Create a BIP322 proof using sendMany with type 'bip322'
+ * 5. Verify the proof using bip322.assertBip322TxProof
+ *
+ * IMPORTANT: This example does NOT work with descriptor wallets.
+ * Only use this with traditional BitGo multi-sig wallets.
+ * 
+ * This works for Hot wallets only.
+ * 
+ * Supports all address types except for Taproot Musig2.
+ *
+ * Copyright 2025, BitGo, Inc.  All Rights Reserved.
+ */
+
+import * as fs from 'fs';
+import * as path from 'path';
+import { BitGo } from 'bitgo';
+import { AbstractUtxoCoin } from '@bitgo/abstract-utxo';
+import * as utxolib from '@bitgo/utxo-lib';
+import { bip322 } from '@bitgo/utxo-core';
+import { BIP32Factory, ecc } from '@bitgo/secp256k1';
+
+// ============================================================================
+// CONFIGURATION - Set these values before running
+// ============================================================================
+
+// Set your environment: 'prod' for mainnet, 'test' for testnet
+const environment: 'prod' | 'test' = 'test';
+
+// Set the coin: 'btc' for mainnet, 'tbtc4' for testnet
+const coin = 'tbtc4';
+
+// Set your BitGo access token
+const accessToken = '';
+
+// Set your wallet ID
+const walletId = '';
+
+// Set your wallet passphrase for signing
+const walletPassphrase = '';
+
+// Set the OTP code. If you dont need one, set it to undefined.
+const otp: string | undefined = undefined;
+
+// ============================================================================
+// TYPES
+// ============================================================================
+
+interface MessageEntry {
+  address: string;
+  message: string;
+}
+
+async function main(): Promise<void> {
+  // Validate configuration
+  if (!accessToken) {
+    throw new Error('Please set your accessToken in the configuration section');
+  }
+  if (!walletId) {
+    throw new Error('Please set your walletId in the configuration section');
+  }
+  if (!walletPassphrase) {
+    throw new Error('Please set your walletPassphrase in the configuration section');
+  }
+
+  // Initialize BitGo SDK
+  const bitgo = new BitGo({ env: environment });
+  bitgo.authenticateWithAccessToken({ accessToken });
+  if (otp) {
+    const unlock = await bitgo.unlock({ otp, duration: 3600 });
+    if (!unlock) {
+      console.log('We did not unlock.');
+      throw new Error();
+    }
+  }
+
+  const baseCoin = bitgo.coin(coin);
+
+  console.log(`Environment: ${environment}`);
+  console.log(`Coin: ${coin}`);
+  console.log(`Wallet ID: ${walletId}`);
+
+  // Read messages from JSON file
+  const messagesPath = path.join(__dirname, 'messages.json');
+  const messagesContent = fs.readFileSync(messagesPath, 'utf-8');
+  const messages: MessageEntry[] = JSON.parse(messagesContent);
+
+  if (!Array.isArray(messages) || messages.length === 0) {
+    throw new Error('messages.json must contain an array of {address, message} objects');
+  }
+
+  console.log(`\nLoaded ${messages.length} message(s) to prove:`);
+  messages.forEach((m, i) => {
+    console.log(`  ${i + 1}. Address: ${m.address}`);
+    console.log(`     Message: ${m.message}`);
+  });
+
+  // Get the wallet
+  console.log('\nFetching wallet...');
+  const wallet = await baseCoin.wallets().get({ id: walletId });
+  console.log(`Wallet label: ${wallet.label()}`);
+
+  // Get keychains for the wallet (needed for deriving pubkeys)
+  console.log('\nFetching keychains...');
+  const keychains = await baseCoin.keychains().getKeysForSigning({ wallet });
+  const xpubs = keychains.map((k) => {
+    if (!k.pub) {
+      throw new Error('Keychain missing public key');
+    }
+    return k.pub;
+  });
+  console.log('Retrieved wallet public keys');
+
+  // Create RootWalletKeys from xpubs for derivation
+  const bip32 = BIP32Factory(ecc);
+  const rootWalletKeys = new utxolib.bitgo.RootWalletKeys(
+    xpubs.map((xpub) => bip32.fromBase58(xpub)) as utxolib.bitgo.Triple<utxolib.BIP32Interface>
+  );
+
+  // Build messageInfo array by getting address details for each message
+  console.log('\nBuilding message info from address data...');
+  const messageInfo: bip322.MessageInfo[] = [];
+
+  for (const entry of messages) {
+    // Get address information from wallet to obtain chain and index
+    console.log(`  Getting address info for: ${entry.address}`);
+    const addressInfo = await wallet.getAddress({ address: entry.address });
+
+    if (addressInfo.chain === undefined || addressInfo.index === undefined) {
+      throw new Error(`Address ${entry.address} is missing chain or index information`);
+    }
+
+    const chain = addressInfo.chain as utxolib.bitgo.ChainCode;
+    const index = addressInfo.index;
+
+    // Derive scriptType from chain
+    const scriptType = utxolib.bitgo.scriptTypeForChain(chain);
+
+    // Derive pubkeys for this address using chain and index
+    const derivedKeys = rootWalletKeys.deriveForChainAndIndex(chain, index);
+    const pubkeys = derivedKeys.publicKeys.map((pk) => pk.toString('hex'));
+
+    console.log(`    Chain: ${chain}, Index: ${index}, ScriptType: ${scriptType}`);
+
+    messageInfo.push({
+      address: entry.address,
+      message: entry.message,
+      pubkeys,
+      scriptType,
+    });
+  }
+
+  console.log('\nCreating BIP322 proof via sendMany...');
+  const sendManyResult = await wallet.sendMany({
+    recipients: [],
+    messages: messages,
+    walletPassphrase,
+  });
+
+  console.log('BIP322 proof created successfully');
+
+  // Extract the signed transaction from the result
+  // The result should contain the fully signed PSBT or transaction hex
+  const txHex = sendManyResult.txHex || sendManyResult.tx;
+  if (!txHex) {
+    throw new Error('No transaction hex found in sendMany result');
+  }
+
+  console.log('\nVerifying BIP322 proof...');
+
+  // Parse the transaction and verify
+  const network = (baseCoin as AbstractUtxoCoin).network;
+
+  // Check if it's a PSBT or raw transaction
+  if (utxolib.bitgo.isPsbt(txHex)) {
+    // Parse as PSBT
+    const psbt = utxolib.bitgo.createPsbtFromHex(txHex, network);
+    bip322.assertBip322PsbtProof(psbt, messageInfo);
+    console.log('PSBT proof verified successfully!');
+  } else {
+    // Parse as raw transaction
+    const tx = utxolib.bitgo.createTransactionFromHex<bigint>(txHex, network, { amountType: 'bigint' });
+    bip322.assertBip322TxProof(tx, messageInfo);
+    console.log('Transaction proof verified successfully!');
+  }
+
+  // Display summary
+  console.log('\n============================================');
+  console.log('BIP322 PROOF VERIFICATION COMPLETE');
+  console.log('============================================');
+  console.log(`Verified ${messageInfo.length} address/message pair(s):`);
+  messageInfo.forEach((info, i) => {
+    console.log(`\n${i + 1}. Address: ${info.address}`);
+    console.log(`   Message: "${info.message}"`);
+    console.log(`   Script Type: ${info.scriptType}`);
+  });
+  console.log('\nAll proofs are valid. The wallet controls the specified addresses.');
+}
+
+// Run the example
+main()
+  .then(() => {
+    console.log('\nExample completed successfully.');
+    process.exit(0);
+  })
+  .catch((e) => {
+    console.error('\nExample failed with error:', e.message);
+    if (e.result) {
+      console.error('API Error details:', JSON.stringify(e.result, null, 2));
+    }
+    process.exit(1);
+  });