dashpay · QuantumExplorer · Apr 29, 2026 · Mar 12, 2026 · Mar 12, 2026 · Mar 12, 2026
@@ -24,6 +24,7 @@ pub mod mock_bls;
 pub mod platform_address;
 pub mod public_key;
 pub mod serialization;
+pub mod shielded;
 pub mod state_transitions;
 pub mod tokens;
 pub mod utils;
@@ -66,6 +67,10 @@ pub use platform_address::{
     PlatformAddressWasm, default_fee_strategy, fee_strategy_from_steps,
     fee_strategy_from_steps_or_default, outputs_to_btree_map, outputs_to_optional_btree_map,
 };
+pub use shielded::{
+    ShieldFromAssetLockTransitionWasm, ShieldTransitionWasm, ShieldedTransferTransitionWasm,
+    ShieldedWithdrawalTransitionWasm, UnshieldTransitionWasm,
+};
 pub use state_transitions::base::{GroupStateTransitionInfoWasm, StateTransitionWasm};
 pub use state_transitions::proof_result::{StateTransitionProofResultTypeJs, convert_proof_result};
 pub use tokens::*;

@@ -0,0 +1,37 @@
+pub mod shield_from_asset_lock_transition;
+pub mod shield_transition;
+pub mod shielded_transfer_transition;
+pub mod shielded_withdrawal_transition;
+pub mod unshield_transition;
+
+pub use shield_from_asset_lock_transition::ShieldFromAssetLockTransitionWasm;
+pub use shield_transition::ShieldTransitionWasm;
+pub use shielded_transfer_transition::ShieldedTransferTransitionWasm;
+pub use shielded_withdrawal_transition::ShieldedWithdrawalTransitionWasm;
+pub use unshield_transition::UnshieldTransitionWasm;
+
+use crate::error::WasmDppResult;
+use wasm_bindgen::prelude::wasm_bindgen;
+
+/// Compute the platform sighash from an Orchard bundle commitment and extra data.
+///
+/// `sighash = SHA-256("DashPlatformSighash" || bundleCommitment || extraData)`
+///
+/// - For shield and shielded_transfer transitions, `extraData` should be empty.
+/// - For unshield transitions, `extraData` = serialized `outputAddress` bytes.
+/// - For shielded withdrawal transitions, `extraData` = `outputScript` bytes.
+#[wasm_bindgen(js_name = computePlatformSighash)]
+pub fn compute_platform_sighash_wasm(
+    bundle_commitment: &[u8],
+    extra_data: &[u8],
+) -> WasmDppResult<Vec<u8>> {
+    if bundle_commitment.len() != 32 {
+        return Err(crate::error::WasmDppError::invalid_argument(format!(
+            "bundleCommitment must be exactly 32 bytes, got {}",
+            bundle_commitment.len()
+        )));
+    }
+    let commitment: &[u8; 32] = bundle_commitment.try_into().expect("checked length above");
+    let result = dpp::shielded::compute_platform_sighash(commitment, extra_data);
+    Ok(result.to_vec())
+}
@@ -0,0 +1,271 @@
+use crate::asset_lock_proof::AssetLockProofWasm;
+use crate::error::{WasmDppError, WasmDppResult};
+use crate::identifier::IdentifierWasm;
+use crate::utils::try_from_options;
+use crate::{impl_wasm_conversions_serde, impl_wasm_type_info};
+use dpp::platform_value::BinaryData;
+use dpp::serialization::{PlatformDeserializable, PlatformSerializable};
+use dpp::state_transition::shield_from_asset_lock_transition::ShieldFromAssetLockTransition;
+use dpp::state_transition::shield_from_asset_lock_transition::v0::ShieldFromAssetLockTransitionV0;
+use dpp::state_transition::{StateTransition, StateTransitionLike};
+use serde::{Deserialize, Serialize};
+use wasm_bindgen::prelude::*;
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct ShieldFromAssetLockTransitionSimpleFields {
+    #[serde(default)]
+    actions: Vec<dpp::shielded::SerializedAction>,
+    #[serde(default)]
+    value_balance: u64,
+    #[serde(default)]
+    anchor: Vec<u8>,
+    #[serde(default)]
+    proof: Vec<u8>,
+    #[serde(default)]
+    binding_signature: Vec<u8>,
+    #[serde(default)]
+    signature: Vec<u8>,
+}
+
+#[wasm_bindgen(typescript_custom_section)]
+const TS_TYPES: &str = r#"
+/**
+ * A serialized Orchard action (spend-output pair) in binary/Object form.
+ */
+export interface SerializedOrchardAction {
+    nullifier: Uint8Array;
+    rk: Uint8Array;
+    cmx: Uint8Array;
+    encryptedNote: Uint8Array;
+    cvNet: Uint8Array;
+    spendAuthSig: Uint8Array;
+}
+
+/**
+ * A serialized Orchard action (spend-output pair) in JSON form.
+ */
+export interface SerializedOrchardActionJSON {
+    nullifier: string;
+    rk: string;
+    cmx: string;
+    encryptedNote: string;
+    cvNet: string;
+    spendAuthSig: string;
+}
+
+/**
+ * Options for constructing a ShieldFromAssetLockTransition.
+ * Uses WASM instance types for complex fields like AssetLockProof.
+ */
+export interface ShieldFromAssetLockTransitionOptions {
+    assetLockProof: AssetLockProof;
+    actions: SerializedOrchardAction[];
+    valueBalance: bigint;
+    anchor: Uint8Array;
+    proof: Uint8Array;
+    bindingSignature: Uint8Array;
+    signature: Uint8Array;
+}
+
+/**
+ * ShieldFromAssetLockTransition serialized as a plain object.
+ */
+export interface ShieldFromAssetLockTransitionObject {
+    $formatVersion: string;
+    assetLockProof: AssetLockProofObject;
+    actions: SerializedOrchardAction[];
+    valueBalance: bigint;
+    anchor: Uint8Array;
+    proof: Uint8Array;
+    bindingSignature: Uint8Array;
+    signature: Uint8Array;
+}
+
+/**
+ * ShieldFromAssetLockTransition serialized as JSON (human-readable).
+ */
+export interface ShieldFromAssetLockTransitionJSON {
+    $formatVersion: string;
+    assetLockProof: AssetLockProofJSON;
+    actions: SerializedOrchardActionJSON[];
+    valueBalance: number | string;
+    anchor: string;
+    proof: string;
+    bindingSignature: string;
+    signature: string;
+}
+"#;
+
+#[wasm_bindgen]
+extern "C" {
+    #[wasm_bindgen(typescript_type = "ShieldFromAssetLockTransitionOptions")]
+    pub type ShieldFromAssetLockTransitionOptionsJs;
+
+    #[wasm_bindgen(typescript_type = "ShieldFromAssetLockTransitionObject")]
+    pub type ShieldFromAssetLockTransitionObjectJs;
+
+    #[wasm_bindgen(typescript_type = "ShieldFromAssetLockTransitionJSON")]
+    pub type ShieldFromAssetLockTransitionJSONJs;
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+#[serde(transparent)]
+#[wasm_bindgen(js_name = ShieldFromAssetLockTransition)]
+pub struct ShieldFromAssetLockTransitionWasm(ShieldFromAssetLockTransition);
+
+impl From<ShieldFromAssetLockTransition> for ShieldFromAssetLockTransitionWasm {
+    fn from(v: ShieldFromAssetLockTransition) -> Self {
+        ShieldFromAssetLockTransitionWasm(v)
+    }
+}
+
+impl From<ShieldFromAssetLockTransitionWasm> for ShieldFromAssetLockTransition {
+    fn from(v: ShieldFromAssetLockTransitionWasm) -> Self {
+        v.0
+    }
+}
+
+#[wasm_bindgen(js_class = ShieldFromAssetLockTransition)]
+impl ShieldFromAssetLockTransitionWasm {
+    #[wasm_bindgen(constructor)]
+    pub fn new(
+        options: ShieldFromAssetLockTransitionOptionsJs,
+    ) -> WasmDppResult<ShieldFromAssetLockTransitionWasm> {
+        // Extract assetLockProof as a WASM instance (required)
+        let asset_lock: AssetLockProofWasm = try_from_options(&options, "assetLockProof")?;
+
+        // Extract remaining simple fields via serde
+        let fields: ShieldFromAssetLockTransitionSimpleFields =
+            serde_wasm_bindgen::from_value(options.into())
+                .map_err(|e| WasmDppError::serialization(e.to_string()))?;
+
+        let anchor: [u8; 32] = fields
+            .anchor
+            .try_into()
+            .map_err(|_| WasmDppError::invalid_argument("anchor must be exactly 32 bytes"))?;
+
+        let binding_signature: [u8; 64] = fields.binding_signature.try_into().map_err(|_| {
+            WasmDppError::invalid_argument("bindingSignature must be exactly 64 bytes")
+        })?;
+
+        Ok(ShieldFromAssetLockTransitionWasm(
+            ShieldFromAssetLockTransition::V0(ShieldFromAssetLockTransitionV0 {
+                asset_lock_proof: asset_lock.into(),
+                actions: fields.actions,
+                value_balance: fields.value_balance,
+                anchor,
+                proof: fields.proof,
+                binding_signature,
+                signature: BinaryData::from(fields.signature),
+            }),
+        ))
+    }
+
+    #[wasm_bindgen(js_name = getType)]
+    pub fn get_type(&self) -> u8 {
+        self.0.state_transition_type() as u8
+    }
+
+    /// Returns the asset lock proof as a JS value.
+    #[wasm_bindgen(js_name = getAssetLockProof)]
+    pub fn get_asset_lock_proof(&self) -> WasmDppResult<JsValue> {
+        let proof = match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => &v0.asset_lock_proof,
+        };
+        serde_wasm_bindgen::to_value(proof).map_err(|e| WasmDppError::serialization(e.to_string()))
+    }
+
+    /// Returns the serialized Orchard actions as a JS array.
+    #[wasm_bindgen(js_name = getActions)]
+    pub fn get_actions(&self) -> WasmDppResult<JsValue> {
+        let inner = match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => &v0.actions,
+        };
+        serde_wasm_bindgen::to_value(inner).map_err(|e| WasmDppError::serialization(e.to_string()))
+    }
+
+    /// Returns the net value balance.
+    #[wasm_bindgen(js_name = getValueBalance)]
+    pub fn get_value_balance(&self) -> u64 {
+        match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => v0.value_balance,
+        }
+    }
+
+    /// Returns the anchor (32-byte Merkle root).
+    #[wasm_bindgen(js_name = getAnchor)]
+    pub fn get_anchor(&self) -> Vec<u8> {
+        match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => v0.anchor.to_vec(),
+        }
+    }
+
+    /// Returns the Halo2 proof bytes.
+    #[wasm_bindgen(js_name = getProof)]
+    pub fn get_proof(&self) -> Vec<u8> {
+        match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => v0.proof.clone(),
+        }
+    }
+
+    /// Returns the RedPallas binding signature (64 bytes).
+    #[wasm_bindgen(js_name = getBindingSignature)]
+    pub fn get_binding_signature(&self) -> Vec<u8> {
+        match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => v0.binding_signature.to_vec(),
+        }
+    }
+
+    /// Returns the ECDSA signature.
+    #[wasm_bindgen(js_name = getSignature)]
+    pub fn get_signature(&self) -> Vec<u8> {
+        match &self.0 {
+            ShieldFromAssetLockTransition::V0(v0) => v0.signature.to_vec(),
+        }
+    }
+
+    #[wasm_bindgen(js_name = getModifiedDataIds)]
+    pub fn modified_data_ids(&self) -> Vec<IdentifierWasm> {
+        self.0
+            .modified_data_ids()
+            .into_iter()
+            .map(IdentifierWasm::from)
+            .collect()
+    }
+
+    #[wasm_bindgen(js_name = toBytes)]
+    pub fn to_bytes(&self) -> WasmDppResult<Vec<u8>> {
+        Ok(PlatformSerializable::serialize_to_bytes(
+            &StateTransition::ShieldFromAssetLock(self.0.clone()),
+        )?)
+    }
+
+    #[wasm_bindgen(js_name = fromBytes)]
+    pub fn from_bytes(bytes: Vec<u8>) -> WasmDppResult<ShieldFromAssetLockTransitionWasm> {
+        let st = StateTransition::deserialize_from_bytes(&bytes)?;
+        match st {
+            StateTransition::ShieldFromAssetLock(inner) => Ok(inner.into()),
+            _ => Err(WasmDppError::invalid_argument(
+                "Invalid state transition type: expected ShieldFromAssetLock",
+            )),
+        }
+    }
+
+    #[wasm_bindgen(js_name = toStateTransition)]
+    pub fn to_state_transition(&self) -> crate::state_transitions::base::StateTransitionWasm {
+        StateTransition::ShieldFromAssetLock(self.0.clone()).into()
+    }
+}
+
+impl_wasm_conversions_serde!(
+    ShieldFromAssetLockTransitionWasm,
+    ShieldFromAssetLockTransition,
+    ShieldFromAssetLockTransitionObjectJs,
+    ShieldFromAssetLockTransitionJSONJs
+);
+
+impl_wasm_type_info!(
+    ShieldFromAssetLockTransitionWasm,
+    ShieldFromAssetLockTransition
+);