diff --git a/src/lib/account.ts b/src/lib/account.ts
index a5a7323..ad5c2d0 100644
--- a/src/lib/account.ts
+++ b/src/lib/account.ts
@@ -230,10 +230,12 @@ export async function getSigner(chain: Chain = 'mvc', treehash?: string) {
     const mnemonic = await getCurrentAccount().then((account) => account!.mnemonic)
     const path = await getAccountProperty(chain, 'path')
     const node = deriveBtcPrivateKey(mnemonic, path, network)
-    let nodeXOnlyPubkey = node.publicKey.subarray(1)
+    const nodeXOnlyPubkey = node.publicKey.subarray(1)
     if (treehash) {
-      nodeXOnlyPubkey = Buffer.concat([nodeXOnlyPubkey, Buffer.from(treehash)])
+      const withTreehash = Buffer.concat([nodeXOnlyPubkey, Buffer.from(treehash, 'hex')])
+      return node.tweak(crypto.taggedHash('TapTweak', withTreehash))
     }
+
     return node.tweak(crypto.taggedHash('TapTweak', nodeXOnlyPubkey))
   }
   const privateKey = await getPrivateKey(chain)
diff --git a/src/lib/actions/btc/sign-psbt.ts b/src/lib/actions/btc/sign-psbt.ts
index 0eea056..02dade1 100644
--- a/src/lib/actions/btc/sign-psbt.ts
+++ b/src/lib/actions/btc/sign-psbt.ts
@@ -17,9 +17,9 @@ export interface ToSignInput {
 }
 
 interface BaseUserToSignInput {
-  index: number;
-  sighashTypes: number[] | undefined;
-  disableTweakSigner?: boolean;
+  index: number
+  sighashTypes: number[] | undefined
+  disableTweakSigner?: boolean
 }
 
 export interface AddressUserToSignInput extends BaseUserToSignInput {
@@ -37,16 +37,20 @@ export interface SignPsbtOptions {
   toSignInputs?: UserToSignInput[]
 }
 
-export async function process({ psbtHex, options }: {
-  psbtHex: string,
+export async function process({
+  psbtHex,
+  options,
+}: {
+  psbtHex: string
   options?: { toSignInputs?: ToSignInput[]; autoFinalized: boolean }
 }): Promise<string> {
   const psbtNetwork = await getBtcNetwork()
   const addressType = await getAddressType('btc')
+  const pubkey = await getPublicKey('btc')
 
-  if (!options) [
+  if (!options) {
     options = { toSignInputs: undefined, autoFinalized: true }
-  ]
+  }
   if (!options?.toSignInputs) {
     // Compatibility with legacy code.
     options.toSignInputs = await formatOptionsToSignInputs(psbtHex)
@@ -56,26 +60,31 @@ export async function process({ psbtHex, options }: {
   const psbt = Psbt.fromHex(psbtHex, { network: psbtNetwork })
 
   psbt.data.inputs.forEach((v, index) => {
-    const isNotSigned = !(v.finalScriptSig || v.finalScriptWitness);
+    const isNotSigned = !(v.finalScriptSig || v.finalScriptWitness)
     const isP2TR = addressType === 'P2TR'
-    const lostInternalPubkey = !v.tapInternalKey;
+    const lostInternalPubkey = !v.tapInternalKey
     // Special measures taken for compatibility with certain applications.
     if (isNotSigned && isP2TR && lostInternalPubkey) {
-      const tapInternalKey = toXOnly(Buffer.from(options!.toSignInputs![index].publicKey, 'hex'));
+      const tapInternalKey = toXOnly(Buffer.from(pubkey, 'hex'))
       const { output } = payments.p2tr({
         internalPubkey: tapInternalKey,
-        network: psbtNetwork
-      });
+        network: psbtNetwork,
+      })
       if (v.witnessUtxo?.script.toString('hex') == output?.toString('hex')) {
-        v.tapInternalKey = tapInternalKey;
+        v.tapInternalKey = tapInternalKey
       }
     }
   })
 
-  options.toSignInputs.forEach(async (v, index) => {
-    const keyPair = await getSigner('btc', options!.toSignInputs![index].treehash)
+  // options.toSignInputs.forEach(async (v, index) => {
+  //   const keyPair = await getSigner('btc', options!.toSignInputs![index].treehash)
+  //   psbt.signInput(v.index, keyPair, v.sighashTypes)
+  // })
+  for (let i = 0; i < options.toSignInputs.length; i++) {
+    const keyPair = await getSigner('btc', options!.toSignInputs![i].treehash)
+    const v = options.toSignInputs[i]
     psbt.signInput(v.index, keyPair, v.sighashTypes)
-  })
+  }
 
   if (options.autoFinalized) {
     options.toSignInputs.forEach((v) => {
@@ -91,72 +100,69 @@ const formatOptionsToSignInputs = async (_psbt: string | Psbt, options?: SignPsb
   const btcAddress = await getAddress('btc')
   const account = { pubkey, address: btcAddress }
 
-  let toSignInputs: ToSignInput[] = [];
+  let toSignInputs: ToSignInput[] = []
   if (options && options.toSignInputs) {
     // We expect userToSignInputs objects to be similar to ToSignInput interface,
     // but we allow address to be specified in addition to publicKey for convenience.
     toSignInputs = options.toSignInputs.map((input) => {
-      const index = Number(input.index);
-      if (isNaN(index)) throw new Error('invalid index in toSignInput');
+      const index = Number(input.index)
+      if (isNaN(index)) throw new Error('invalid index in toSignInput')
 
       if (!(input as AddressUserToSignInput).address && !(input as PublicKeyUserToSignInput).publicKey) {
-        throw new Error('no address or public key in toSignInput');
+        throw new Error('no address or public key in toSignInput')
       }
 
       if ((input as AddressUserToSignInput).address && (input as AddressUserToSignInput).address != account.address) {
-        throw new Error('invalid address in toSignInput');
+        throw new Error('invalid address in toSignInput')
       }
 
       if (
         (input as PublicKeyUserToSignInput).publicKey &&
         (input as PublicKeyUserToSignInput).publicKey != account.pubkey
       ) {
-        throw new Error('invalid public key in toSignInput');
+        throw new Error('invalid public key in toSignInput')
       }
 
-      const sighashTypes = input.sighashTypes?.map(Number);
+      const sighashTypes = input.sighashTypes?.map(Number)
 
-      if (sighashTypes?.some(isNaN)) throw new Error('invalid sighash type in toSignInput');
+      if (sighashTypes?.some(isNaN)) throw new Error('invalid sighash type in toSignInput')
 
       return {
         index,
         publicKey: account.pubkey,
         sighashTypes,
-        disableTweakSigner: input.disableTweakSigner
-      };
-    });
+        disableTweakSigner: input.disableTweakSigner,
+      }
+    })
   } else {
     const networkType = await getNetwork()
     const psbtNetwork = networkType === 'mainnet' ? networks.bitcoin : networks.testnet
 
-    const psbt =
-      typeof _psbt === 'string'
-        ? Psbt.fromHex(_psbt as string, { network: psbtNetwork })
-        : (_psbt as Psbt);
+    const psbt = typeof _psbt === 'string' ? Psbt.fromHex(_psbt as string, { network: psbtNetwork }) : (_psbt as Psbt)
     psbt.data.inputs.forEach((v, index) => {
-      let script: any = null;
-      let value = 0;
+      let script: any = null
+      let value = 0
       if (v.witnessUtxo) {
-        script = v.witnessUtxo.script;
-        value = v.witnessUtxo.value;
+        script = v.witnessUtxo.script
+        value = v.witnessUtxo.value
       } else if (v.nonWitnessUtxo) {
-        const tx = Transaction.fromBuffer(v.nonWitnessUtxo);
-        const output = tx.outs[psbt.txInputs[index].index];
-        script = output.script;
-        value = output.value;
+        const tx = Transaction.fromBuffer(v.nonWitnessUtxo)
+        const output = tx.outs[psbt.txInputs[index].index]
+        script = output.script
+        value = output.value
       }
-      const isSigned = v.finalScriptSig || v.finalScriptWitness;
+      const isSigned = v.finalScriptSig || v.finalScriptWitness
       if (script && !isSigned) {
-        const address = btcjs.address.fromOutputScript(script, psbtNetwork);
+        const address = btcjs.address.fromOutputScript(script, psbtNetwork)
         if (account.address === address) {
           toSignInputs.push({
             index,
             publicKey: account.pubkey,
-            sighashTypes: v.sighashType ? [v.sighashType] : undefined
-          });
+            sighashTypes: v.sighashType ? [v.sighashType] : undefined,
+          })
         }
       }
-    });
+    })
   }
-  return toSignInputs;
-};
+  return toSignInputs
+}