diff --git a/modules/abstract-utxo/src/recovery/backupKeyRecovery.ts b/modules/abstract-utxo/src/recovery/backupKeyRecovery.ts
index 2a3872becb..bbb23f57cb 100644
--- a/modules/abstract-utxo/src/recovery/backupKeyRecovery.ts
+++ b/modules/abstract-utxo/src/recovery/backupKeyRecovery.ts
@@ -11,6 +11,7 @@ import {
   krsProviders,
 } from '@bitgo/sdk-core';
 import { getMainnet, networks } from '@bitgo/utxo-lib';
+import { CoinName } from '@bitgo/wasm-utxo';
 
 import { AbstractUtxoCoin } from '../abstractUtxoCoin';
 import { signAndVerifyPsbt } from '../transaction/fixedScript/signPsbt';
@@ -377,6 +378,7 @@ export async function backupKeyRecovery(
       recoveryDestination: params.recoveryDestination,
       keyRecoveryServiceFee: krsFee,
       keyRecoveryServiceFeeAddress: krsFeeAddress,
+      coinName: coin.getChain() as CoinName,
     },
     backend
   );
diff --git a/modules/abstract-utxo/src/recovery/crossChainRecovery.ts b/modules/abstract-utxo/src/recovery/crossChainRecovery.ts
index 4b65d98792..c4bd264d1f 100644
--- a/modules/abstract-utxo/src/recovery/crossChainRecovery.ts
+++ b/modules/abstract-utxo/src/recovery/crossChainRecovery.ts
@@ -1,7 +1,7 @@
 import * as utxolib from '@bitgo/utxo-lib';
 import { BIP32Interface, bip32 } from '@bitgo/secp256k1';
 import { Dimensions } from '@bitgo/unspents';
-import { fixedScriptWallet } from '@bitgo/wasm-utxo';
+import { fixedScriptWallet, CoinName } from '@bitgo/wasm-utxo';
 import { BitGoBase, IWallet, Keychain, Triple, Wallet } from '@bitgo/sdk-core';
 import { decrypt } from '@bitgo/sdk-api';
 
@@ -388,6 +388,7 @@ function createSweepTransactionUtxolib<TNumber extends number | bigint = number>
  * @param unspents
  * @param targetAddress
  * @param feeRateSatVB
+ * @param coinName - BitGo coin name (e.g. 'btc', 'tbtc', 'ltc')
  * @return unsigned PSBT
  */
 function createSweepTransactionWasm<TNumber extends number | bigint = number>(
@@ -395,7 +396,8 @@ function createSweepTransactionWasm<TNumber extends number | bigint = number>(
   walletKeys: RootWalletKeys,
   unspents: WalletUnspent<TNumber>[],
   targetAddress: string,
-  feeRateSatVB: number
+  feeRateSatVB: number,
+  coinName: CoinName
 ): utxolib.bitgo.UtxoPsbt {
   const inputValue = unspentSum<bigint>(
     unspents.map((u) => ({ ...u, value: BigInt(u.value) })),
@@ -408,9 +410,8 @@ function createSweepTransactionWasm<TNumber extends number | bigint = number>(
   addWalletInputsToWasmPsbt(wasmPsbt, unspentsBigint, walletKeys);
 
   // Calculate dimensions using wasm-utxo Dimensions
-  const targetOutputScript = utxolib.address.toOutputScript(targetAddress, network);
   const vsize = fixedScriptWallet.Dimensions.fromPsbt(wasmPsbt)
-    .plus(fixedScriptWallet.Dimensions.fromOutput(new Uint8Array(targetOutputScript)))
+    .plus(fixedScriptWallet.Dimensions.fromOutput(targetAddress, coinName))
     .getVSize();
   const fee = BigInt(Math.round(vsize * feeRateSatVB));
 
@@ -429,6 +430,7 @@ function createSweepTransactionWasm<TNumber extends number | bigint = number>(
  * @param targetAddress
  * @param feeRateSatVB
  * @param backend - Which backend to use for PSBT creation (default: 'wasm-utxo')
+ * @param coinName - BitGo coin name (required for wasm-utxo backend)
  * @return unsigned PSBT
  */
 function createSweepTransaction<TNumber extends number | bigint = number>(
@@ -437,10 +439,14 @@ function createSweepTransaction<TNumber extends number | bigint = number>(
   unspents: WalletUnspent<TNumber>[],
   targetAddress: string,
   feeRateSatVB: number,
-  backend: PsbtBackend = 'wasm-utxo'
+  backend: PsbtBackend = 'wasm-utxo',
+  coinName?: CoinName
 ): utxolib.bitgo.UtxoPsbt {
   if (backend === 'wasm-utxo') {
-    return createSweepTransactionWasm(network, walletKeys, unspents, targetAddress, feeRateSatVB);
+    if (!coinName) {
+      throw new Error('coinName is required for wasm-utxo backend');
+    }
+    return createSweepTransactionWasm(network, walletKeys, unspents, targetAddress, feeRateSatVB, coinName);
   } else {
     return createSweepTransactionUtxolib(network, walletKeys, unspents, targetAddress, feeRateSatVB);
   }
@@ -502,7 +508,8 @@ export async function recoverCrossChain<TNumber extends number | bigint = number
     walletUnspents,
     params.recoveryAddress,
     feeRateSatVB,
-    backend
+    backend,
+    params.sourceCoin.getChain() as CoinName
   );
 
   // For unsigned recovery, return unsigned PSBT hex
diff --git a/modules/abstract-utxo/src/recovery/psbt.ts b/modules/abstract-utxo/src/recovery/psbt.ts
index d6023a14d2..a829473376 100644
--- a/modules/abstract-utxo/src/recovery/psbt.ts
+++ b/modules/abstract-utxo/src/recovery/psbt.ts
@@ -1,6 +1,6 @@
 import * as utxolib from '@bitgo/utxo-lib';
 import { Dimensions } from '@bitgo/unspents';
-import { fixedScriptWallet, utxolibCompat } from '@bitgo/wasm-utxo';
+import { fixedScriptWallet, utxolibCompat, CoinName } from '@bitgo/wasm-utxo';
 
 type RootWalletKeys = utxolib.bitgo.RootWalletKeys;
 type WalletUnspent<TNumber extends number | bigint> = utxolib.bitgo.WalletUnspent<TNumber>;
@@ -60,6 +60,8 @@ interface CreateBackupKeyRecoveryPsbtOptions {
   keyRecoveryServiceFeeAddress: string | undefined;
   /** Block height for Zcash networks (required to determine consensus branch ID) */
   blockHeight?: number;
+  /** Coin name for wasm-utxo (e.g. 'btc', 'tbtc', 'ltc') */
+  coinName?: CoinName;
 }
 
 /**
@@ -243,21 +245,23 @@ function createBackupKeyRecoveryPsbtWasm(
   unspents: WalletUnspent<bigint>[],
   options: CreateBackupKeyRecoveryPsbtOptions
 ): utxolib.bitgo.UtxoPsbt {
-  const { feeRateSatVB, recoveryDestination, keyRecoveryServiceFee, keyRecoveryServiceFeeAddress } = options;
+  const { feeRateSatVB, recoveryDestination, keyRecoveryServiceFee, keyRecoveryServiceFeeAddress, coinName } = options;
+
+  if (!coinName) {
+    throw new Error('coinName is required for wasm-utxo backend');
+  }
 
   // Create PSBT with wasm-utxo and add wallet inputs using shared utilities
   const wasmPsbt = createEmptyWasmPsbt(network, rootWalletKeys, { blockHeight: options.blockHeight });
   addWalletInputsToWasmPsbt(wasmPsbt, unspents, rootWalletKeys);
 
   // Calculate dimensions using wasm-utxo Dimensions
-  const recoveryOutputScript = utxolib.address.toOutputScript(recoveryDestination, network);
   let dimensions = fixedScriptWallet.Dimensions.fromPsbt(wasmPsbt).plus(
-    fixedScriptWallet.Dimensions.fromOutput(new Uint8Array(recoveryOutputScript))
+    fixedScriptWallet.Dimensions.fromOutput(recoveryDestination, coinName)
   );
 
   if (keyRecoveryServiceFeeAddress) {
-    const krsOutputScript = utxolib.address.toOutputScript(keyRecoveryServiceFeeAddress, network);
-    dimensions = dimensions.plus(fixedScriptWallet.Dimensions.fromOutput(new Uint8Array(krsOutputScript)));
+    dimensions = dimensions.plus(fixedScriptWallet.Dimensions.fromOutput(keyRecoveryServiceFeeAddress, coinName));
   }
 
   const approximateFee = BigInt(dimensions.getVSize() * feeRateSatVB);