diff --git a/packages/wasm-utxo/js/psbt.ts b/packages/wasm-utxo/js/psbt.ts
index 5a0666d8995..dc6fd35727d 100644
--- a/packages/wasm-utxo/js/psbt.ts
+++ b/packages/wasm-utxo/js/psbt.ts
@@ -20,10 +20,13 @@ export interface IPsbt extends ITransactionCommon<PsbtInputData, PsbtOutputData>
   removeOutput(index: number): void;
   setKV(key: PsbtKvKey, value: Uint8Array): void;
   getKV(key: PsbtKvKey): Uint8Array | undefined;
+  deleteKV(key: PsbtKvKey): void;
   setInputKV(index: number, key: PsbtKvKey, value: Uint8Array): void;
   getInputKV(index: number, key: PsbtKvKey): Uint8Array | undefined;
+  deleteInputKV(index: number, key: PsbtKvKey): void;
   setOutputKV(index: number, key: PsbtKvKey, value: Uint8Array): void;
   getOutputKV(index: number, key: PsbtKvKey): Uint8Array | undefined;
+  deleteOutputKV(index: number, key: PsbtKvKey): void;
 }
 
 /** Extended PSBT with address resolution (no coin parameter needed) */
diff --git a/packages/wasm-utxo/js/psbtBase.ts b/packages/wasm-utxo/js/psbtBase.ts
index cd370396b30..d4e58bf1c62 100644
--- a/packages/wasm-utxo/js/psbtBase.ts
+++ b/packages/wasm-utxo/js/psbtBase.ts
@@ -16,10 +16,13 @@ interface WasmPsbtBase {
   remove_output(index: number): void;
   set_kv(key: unknown, value: Uint8Array): void;
   get_kv(key: unknown): Uint8Array | null | undefined;
+  delete_kv(key: unknown): void;
   set_input_kv(index: number, key: unknown, value: Uint8Array): void;
   get_input_kv(index: number, key: unknown): Uint8Array | null | undefined;
+  delete_input_kv(index: number, key: unknown): void;
   set_output_kv(index: number, key: unknown, value: Uint8Array): void;
   get_output_kv(index: number, key: unknown): Uint8Array | null | undefined;
+  delete_output_kv(index: number, key: unknown): void;
 }
 
 export abstract class PsbtBase<W extends WasmPsbtBase> {
@@ -80,4 +83,13 @@ export abstract class PsbtBase<W extends WasmPsbtBase> {
   getOutputKV(index: number, key: PsbtKvKey): Uint8Array | undefined {
     return this._wasm.get_output_kv(index, key) ?? undefined;
   }
+  deleteKV(key: PsbtKvKey): void {
+    this._wasm.delete_kv(key);
+  }
+  deleteInputKV(index: number, key: PsbtKvKey): void {
+    this._wasm.delete_input_kv(index, key);
+  }
+  deleteOutputKV(index: number, key: PsbtKvKey): void {
+    this._wasm.delete_output_kv(index, key);
+  }
 }
diff --git a/packages/wasm-utxo/src/psbt_ops.rs b/packages/wasm-utxo/src/psbt_ops.rs
index 63fa9d2f9b4..dc8bb238da5 100644
--- a/packages/wasm-utxo/src/psbt_ops.rs
+++ b/packages/wasm-utxo/src/psbt_ops.rs
@@ -48,6 +48,14 @@ pub trait PsbtAccess {
         self.psbt().proprietary.get(key).cloned()
     }
 
+    fn delete_global_unknown_kv(&mut self, key: raw::Key) {
+        self.psbt_mut().unknown.remove(&key);
+    }
+
+    fn delete_global_proprietary_kv(&mut self, key: raw::ProprietaryKey) {
+        self.psbt_mut().proprietary.remove(&key);
+    }
+
     // -------------------------------------------------------------------------
     // Per-input KV accessors
     // -------------------------------------------------------------------------
@@ -112,6 +120,32 @@ pub trait PsbtAccess {
         Ok(self.psbt().inputs[index].proprietary.get(key).cloned())
     }
 
+    fn delete_input_unknown_kv(&mut self, index: usize, key: raw::Key) -> Result<(), String> {
+        let len = self.psbt().inputs.len();
+        if index >= len {
+            return Err(format!(
+                "input index {index} out of bounds (have {len} inputs)"
+            ));
+        }
+        self.psbt_mut().inputs[index].unknown.remove(&key);
+        Ok(())
+    }
+
+    fn delete_input_proprietary_kv(
+        &mut self,
+        index: usize,
+        key: raw::ProprietaryKey,
+    ) -> Result<(), String> {
+        let len = self.psbt().inputs.len();
+        if index >= len {
+            return Err(format!(
+                "input index {index} out of bounds (have {len} inputs)"
+            ));
+        }
+        self.psbt_mut().inputs[index].proprietary.remove(&key);
+        Ok(())
+    }
+
     // -------------------------------------------------------------------------
     // Per-output KV accessors
     // -------------------------------------------------------------------------
@@ -178,6 +212,32 @@ pub trait PsbtAccess {
         Ok(self.psbt().outputs[index].proprietary.get(key).cloned())
     }
 
+    fn delete_output_unknown_kv(&mut self, index: usize, key: raw::Key) -> Result<(), String> {
+        let len = self.psbt().outputs.len();
+        if index >= len {
+            return Err(format!(
+                "output index {index} out of bounds (have {len} outputs)"
+            ));
+        }
+        self.psbt_mut().outputs[index].unknown.remove(&key);
+        Ok(())
+    }
+
+    fn delete_output_proprietary_kv(
+        &mut self,
+        index: usize,
+        key: raw::ProprietaryKey,
+    ) -> Result<(), String> {
+        let len = self.psbt().outputs.len();
+        if index >= len {
+            return Err(format!(
+                "output index {index} out of bounds (have {len} outputs)"
+            ));
+        }
+        self.psbt_mut().outputs[index].proprietary.remove(&key);
+        Ok(())
+    }
+
     fn remove_input(&mut self, index: usize) -> Result<(), String> {
         let psbt = self.psbt_mut();
         if index >= psbt.inputs.len() {
diff --git a/packages/wasm-utxo/src/wasm/psbt.rs b/packages/wasm-utxo/src/wasm/psbt.rs
index 00bf88cd30d..128c5bc6b5b 100644
--- a/packages/wasm-utxo/src/wasm/psbt.rs
+++ b/packages/wasm-utxo/src/wasm/psbt.rs
@@ -833,6 +833,26 @@ macro_rules! impl_wasm_psbt_ops {
             ) -> Result<Option<Vec<u8>>, $crate::error::WasmUtxoError> {
                 self.wasm_get_output_kv(index, key)
             }
+            pub fn delete_kv(
+                &mut self,
+                key: ::wasm_bindgen::JsValue,
+            ) -> Result<(), $crate::error::WasmUtxoError> {
+                self.wasm_delete_kv(key)
+            }
+            pub fn delete_input_kv(
+                &mut self,
+                index: usize,
+                key: ::wasm_bindgen::JsValue,
+            ) -> Result<(), $crate::error::WasmUtxoError> {
+                self.wasm_delete_input_kv(index, key)
+            }
+            pub fn delete_output_kv(
+                &mut self,
+                index: usize,
+                key: ::wasm_bindgen::JsValue,
+            ) -> Result<(), $crate::error::WasmUtxoError> {
+                self.wasm_delete_output_kv(index, key)
+            }
         }
     };
     ($type:ty, $field:ident) => {
@@ -921,6 +941,26 @@ macro_rules! impl_wasm_psbt_ops {
             ) -> Result<Option<Vec<u8>>, $crate::error::WasmUtxoError> {
                 self.$field.wasm_get_output_kv(index, key)
             }
+            pub fn delete_kv(
+                &mut self,
+                key: ::wasm_bindgen::JsValue,
+            ) -> Result<(), $crate::error::WasmUtxoError> {
+                self.$field.wasm_delete_kv(key)
+            }
+            pub fn delete_input_kv(
+                &mut self,
+                index: usize,
+                key: ::wasm_bindgen::JsValue,
+            ) -> Result<(), $crate::error::WasmUtxoError> {
+                self.$field.wasm_delete_input_kv(index, key)
+            }
+            pub fn delete_output_kv(
+                &mut self,
+                index: usize,
+                key: ::wasm_bindgen::JsValue,
+            ) -> Result<(), $crate::error::WasmUtxoError> {
+                self.$field.wasm_delete_output_kv(index, key)
+            }
         }
     };
 }
diff --git a/packages/wasm-utxo/src/wasm/psbt_ops.rs b/packages/wasm-utxo/src/wasm/psbt_ops.rs
index 5294e3d709c..4a4fbabbb5c 100644
--- a/packages/wasm-utxo/src/wasm/psbt_ops.rs
+++ b/packages/wasm-utxo/src/wasm/psbt_ops.rs
@@ -114,6 +114,30 @@ pub(crate) trait WasmPsbtOps: PsbtAccess {
         }
         .map_err(|e| WasmUtxoError::new(&e))
     }
+
+    fn wasm_delete_kv(&mut self, key: JsValue) -> Result<(), WasmUtxoError> {
+        match PsbtKvKey::try_from_js_value(&key)? {
+            PsbtKvKey::Unknown(k) => PsbtAccess::delete_global_unknown_kv(self, k),
+            PsbtKvKey::Proprietary(k) => PsbtAccess::delete_global_proprietary_kv(self, k),
+        }
+        Ok(())
+    }
+
+    fn wasm_delete_input_kv(&mut self, index: usize, key: JsValue) -> Result<(), WasmUtxoError> {
+        match PsbtKvKey::try_from_js_value(&key)? {
+            PsbtKvKey::Unknown(k) => PsbtAccess::delete_input_unknown_kv(self, index, k),
+            PsbtKvKey::Proprietary(k) => PsbtAccess::delete_input_proprietary_kv(self, index, k),
+        }
+        .map_err(|e| WasmUtxoError::new(&e))
+    }
+
+    fn wasm_delete_output_kv(&mut self, index: usize, key: JsValue) -> Result<(), WasmUtxoError> {
+        match PsbtKvKey::try_from_js_value(&key)? {
+            PsbtKvKey::Unknown(k) => PsbtAccess::delete_output_unknown_kv(self, index, k),
+            PsbtKvKey::Proprietary(k) => PsbtAccess::delete_output_proprietary_kv(self, index, k),
+        }
+        .map_err(|e| WasmUtxoError::new(&e))
+    }
 }
 
 impl<T: PsbtAccess> WasmPsbtOps for T {}