diff --git a/CMakeLists.txt b/CMakeLists.txt
index be76ab84e..71ddc31c4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,7 +100,7 @@ set_target_properties(
 
 set(BOOST ${CMAKE_SOURCE_DIR}/build/boost)
 include_directories("${BOOST}")
-include_directories("${BOOST}/include") # must exist already - run bin/build-boost-emscripten.sh
+include_directories("${BOOST}/include") # must exist already - run bin/build_boost_emscripten.sh
 
 add_library(boost_chrono STATIC IMPORTED)
 set_target_properties(
@@ -355,7 +355,7 @@ if (BUILD_MONERO_WALLET_FULL_WASM)
         boost_system
         boost_thread
         boost_serialization
-        #boost_filesystem
+        boost_filesystem
         boost_regex
         #boost_atomic
         #
diff --git a/bin/build_boost_emscripten.sh b/bin/build_boost_emscripten.sh
index 150615e47..1005bbd53 100755
--- a/bin/build_boost_emscripten.sh
+++ b/bin/build_boost_emscripten.sh
@@ -85,7 +85,7 @@ export NO_BZIP2=1 #bc it's supplied by emscripten but b2 will fail to find it
 
 
 ./bootstrap.sh \
-  --with-libraries=system,thread,chrono,serialization,regex \
+  --with-libraries=system,thread,chrono,serialization,regex,filesystem \
 2>&1
 
 if [ $? != 0 ]; then
diff --git a/external/monero-cpp b/external/monero-cpp
index 3d7c01a8a..7d91986f5 160000
--- a/external/monero-cpp
+++ b/external/monero-cpp
@@ -1 +1 @@
-Subproject commit 3d7c01a8a85cad7794966d2f9aba0875be95cd3a
+Subproject commit 7d91986f59bfd5cde8c3d57ea37e073920a14da2
diff --git a/src/main/ts/wallet/MoneroWallet.ts b/src/main/ts/wallet/MoneroWallet.ts
index ceee4ae1a..aca72eee8 100644
--- a/src/main/ts/wallet/MoneroWallet.ts
+++ b/src/main/ts/wallet/MoneroWallet.ts
@@ -1465,7 +1465,7 @@ export default class MoneroWallet {
     }
   }
   
-  protected static normalizeTxQuery(query) {
+  protected static normalizeTxQuery(query): MoneroTxQuery {
     if (query instanceof MoneroTxQuery) query = query.copy();
     else if (Array.isArray(query)) query = new MoneroTxQuery().setHashes(query);
     else {
@@ -1478,7 +1478,7 @@ export default class MoneroWallet {
     return query;
   }
   
-  protected static normalizeTransferQuery(query) {
+  protected static normalizeTransferQuery(query): MoneroTransferQuery {
     query = new MoneroTransferQuery(query);
     if (query.getTxQuery() !== undefined) {
       let txQuery = query.getTxQuery().copy();
@@ -1490,7 +1490,7 @@ export default class MoneroWallet {
     return query;
   }
   
-  protected static normalizeOutputQuery(query) {
+  protected static normalizeOutputQuery(query): MoneroOutputQuery {
     query = new MoneroOutputQuery(query);
     if (query.getTxQuery() !== undefined) {
       let txQuery = query.getTxQuery().copy();
@@ -1502,7 +1502,7 @@ export default class MoneroWallet {
     return query;
   }
   
-  protected static normalizeCreateTxsConfig(config) {
+  protected static normalizeCreateTxsConfig(config): MoneroTxConfig {
     if (config === undefined || !(config instanceof Object)) throw new MoneroError("Must provide MoneroTxConfig or equivalent JS object");
     config = new MoneroTxConfig(config);
     assert(config.getDestinations() && config.getDestinations().length > 0, "Must provide destinations");
@@ -1511,7 +1511,7 @@ export default class MoneroWallet {
     return config;
   }
   
-  protected static normalizeSweepOutputConfig(config) {
+  protected static normalizeSweepOutputConfig(config): MoneroTxConfig {
     if (config === undefined || !(config instanceof Object)) throw new MoneroError("Must provide MoneroTxConfig or equivalent JS object");
     config = new MoneroTxConfig(config);
     assert.equal(config.getSweepEachSubaddress(), undefined);
@@ -1522,7 +1522,7 @@ export default class MoneroWallet {
     return config;  
   }
   
-  protected static normalizeSweepUnlockedConfig(config) {
+  protected static normalizeSweepUnlockedConfig(config): MoneroTxConfig {
     if (config === undefined || !(config instanceof Object)) throw new MoneroError("Must provide MoneroTxConfig or equivalent JS object");
     config = new MoneroTxConfig(config);
     if (config.getDestinations() === undefined || config.getDestinations().length != 1) throw new MoneroError("Must provide exactly one destination to sweep to");
diff --git a/src/main/ts/wallet/MoneroWalletRpc.ts b/src/main/ts/wallet/MoneroWalletRpc.ts
index 0147e7428..d84ef6747 100644
--- a/src/main/ts/wallet/MoneroWalletRpc.ts
+++ b/src/main/ts/wallet/MoneroWalletRpc.ts
@@ -905,7 +905,6 @@ export default class MoneroWalletRpc extends MoneroWallet {
     params.account_index = accountIdx;
     params.subaddr_indices = subaddressIndices;
     params.payment_id = configNormalized.getPaymentId();
-    if (configNormalized.getUnlockTime() !== undefined) params.unlock_time = configNormalized.getUnlockTime().toString()
     params.do_not_relay = configNormalized.getRelay() !== true;
     assert(configNormalized.getPriority() === undefined || configNormalized.getPriority() >= 0 && configNormalized.getPriority() <= 3);
     params.priority = configNormalized.getPriority();
@@ -961,7 +960,6 @@ export default class MoneroWalletRpc extends MoneroWallet {
     params.account_index = config.getAccountIndex();
     params.subaddr_indices = config.getSubaddressIndices();
     params.key_image = config.getKeyImage();
-    if (config.getUnlockTime() !== undefined) params.unlock_time = config.getUnlockTime();
     params.do_not_relay = config.getRelay() !== true;
     assert(config.getPriority() === undefined || config.getPriority() >= 0 && config.getPriority() <= 3);
     params.priority = config.getPriority();
@@ -1756,7 +1754,7 @@ export default class MoneroWalletRpc extends MoneroWallet {
     return resp.result.signed_key_images.map(rpcImage => new MoneroKeyImage(rpcImage.key_image, rpcImage.signature));
   }
   
-  protected async rpcSweepAccount(config) {
+  protected async rpcSweepAccount(config: MoneroTxConfig) {
     
     // validate config
     if (config === undefined) throw new MoneroError("Must provide sweep config");
@@ -1786,7 +1784,6 @@ export default class MoneroWalletRpc extends MoneroWallet {
     params.address = config.getDestinations()[0].getAddress();
     assert(config.getPriority() === undefined || config.getPriority() >= 0 && config.getPriority() <= 3);
     params.priority = config.getPriority();
-    if (config.getUnlockTime() !== undefined) params.unlock_time = config.getUnlockTime();
     params.payment_id = config.getPaymentId();
     params.do_not_relay = !relay;
     params.below_amount = config.getBelowAmount();
@@ -1818,7 +1815,7 @@ export default class MoneroWalletRpc extends MoneroWallet {
       transfer.setDestinations([destination]);
       tx.setOutgoingTransfer(transfer);
       tx.setPaymentId(config.getPaymentId());
-      if (tx.getUnlockTime() === undefined) tx.setUnlockTime(config.getUnlockTime() === undefined ? 0 : config.getUnlockTime());
+      if (tx.getUnlockTime() === undefined) tx.setUnlockTime(0n);
       if (tx.getRelay()) {
         if (tx.getLastRelayedTimestamp() === undefined) tx.setLastRelayedTimestamp(+new Date().getTime());  // TODO (monero-wallet-rpc): provide timestamp on response; unconfirmed timestamps vary
         if (tx.getIsDoubleSpendSeen() === undefined) tx.setIsDoubleSpendSeen(false);
@@ -1926,7 +1923,7 @@ export default class MoneroWalletRpc extends MoneroWallet {
    * @param {boolean} copyDestinations - copies config destinations if true
    * @return {MoneroTxWallet} is the initialized send tx
    */
-  protected static initSentTxWallet(config, tx, copyDestinations) {
+  protected static initSentTxWallet(config: Partial<MoneroTxConfig>, tx, copyDestinations) {
     if (!tx) tx = new MoneroTxWallet();
     let relay = config.getRelay() === true;
     tx.setIsOutgoing(true);
@@ -1949,7 +1946,7 @@ export default class MoneroWalletRpc extends MoneroWallet {
     }
     tx.setOutgoingTransfer(transfer);
     tx.setPaymentId(config.getPaymentId());
-    if (tx.getUnlockTime() === undefined) tx.setUnlockTime(config.getUnlockTime() === undefined ? 0 : config.getUnlockTime());
+    if (tx.getUnlockTime() === undefined) tx.setUnlockTime(0n);
     if (config.getRelay()) {
       if (tx.getLastRelayedTimestamp() === undefined) tx.setLastRelayedTimestamp(+new Date().getTime());  // TODO (monero-wallet-rpc): provide timestamp on response; unconfirmed timestamps vary
       if (tx.getIsDoubleSpendSeen() === undefined) tx.setIsDoubleSpendSeen(false);
diff --git a/src/main/ts/wallet/model/MoneroTxConfig.ts b/src/main/ts/wallet/model/MoneroTxConfig.ts
index 4b8eddd58..4502ba4d9 100644
--- a/src/main/ts/wallet/model/MoneroTxConfig.ts
+++ b/src/main/ts/wallet/model/MoneroTxConfig.ts
@@ -38,9 +38,6 @@ export default class MoneroTxConfig {
   /** Payment ID for the transaction. */
   paymentId: string;
 
-  /** Minimum height or timestamp for the transaction to unlock (default 0). */
-  unlockTime: bigint;
-
   /** Miner fee (calculated automatically). */
   fee: bigint;
 
@@ -102,7 +99,6 @@ export default class MoneroTxConfig {
     // deserialize bigints
     if (this.amount !== undefined && typeof this.amount !== "bigint") this.amount = BigInt(this.amount);
     if (this.fee !== undefined && typeof this.fee !== "bigint") this.fee = BigInt(this.fee);
-    if (this.unlockTime !== undefined && typeof this.unlockTime !== "bigint") this.unlockTime = BigInt(this.unlockTime);
     if (this.belowAmount !== undefined && typeof this.belowAmount !== "bigint") this.belowAmount = BigInt(this.belowAmount);
 
     // copy destinations
@@ -138,7 +134,6 @@ export default class MoneroTxConfig {
       for (let destination of this.getDestinations()) json.destinations.push(destination.toJson());
     }
     if (this.getFee()) json.fee = this.getFee().toString();
-    if (this.getUnlockTime()) json.unlockTime = this.getUnlockTime().toString();
     if (this.getBelowAmount()) json.belowAmount = this.getBelowAmount().toString();
     return json;
   }
@@ -277,15 +272,6 @@ export default class MoneroTxConfig {
     return this;
   }
   
-  getUnlockTime(): bigint {
-    return this.unlockTime;
-  }
-  
-  setUnlockTime(unlockTime: bigint): MoneroTxConfig {
-    this.unlockTime = unlockTime;
-    return this;
-  }
-  
   getRelay(): boolean {
     return this.relay;
   }
diff --git a/src/test/TestMoneroWalletCommon.ts b/src/test/TestMoneroWalletCommon.ts
index 2c73583be..724409c86 100644
--- a/src/test/TestMoneroWalletCommon.ts
+++ b/src/test/TestMoneroWalletCommon.ts
@@ -2979,25 +2979,25 @@ export default class TestMoneroWalletCommon {
       // TODO: test sending to multiple accounts
       if (testConfig.testRelays && testConfig.testNotifications)
       it("Can update a locked tx sent from/to the same account as blocks are added to the chain", async function() {
-        let config = new MoneroTxConfig({accountIndex: 0, address: await that.wallet.getPrimaryAddress(), amount: TestUtils.MAX_FEE, unlockTime: BigInt(await that.daemon.getHeight() + 3), canSplit: false, relay: true});
+        let config = new MoneroTxConfig({accountIndex: 0, address: await that.wallet.getPrimaryAddress(), amount: TestUtils.MAX_FEE, canSplit: false, relay: true});
         await testSendAndUpdateTxs(config);
       });
       
       if (testConfig.testRelays && testConfig.testNotifications && !testConfig.liteMode)
       it("Can update split locked txs sent from/to the same account as blocks are added to the chain", async function() {
-        let config = new MoneroTxConfig({accountIndex: 0, address: await that.wallet.getPrimaryAddress(), amount: TestUtils.MAX_FEE, unlockTime: BigInt(await that.daemon.getHeight() + 3), canSplit: true, relay: true});
+        let config = new MoneroTxConfig({accountIndex: 0, address: await that.wallet.getPrimaryAddress(), amount: TestUtils.MAX_FEE, canSplit: true, relay: true});
         await testSendAndUpdateTxs(config);
       });
       
       if (testConfig.testRelays && testConfig.testNotifications && !testConfig.liteMode)
       it("Can update a locked tx sent from/to different accounts as blocks are added to the chain", async function() {
-        let config = new MoneroTxConfig({accountIndex: 0, address: (await that.wallet.getSubaddress(1, 0)).getAddress(), amount: TestUtils.MAX_FEE, unlockTime: BigInt(await that.daemon.getHeight() + 3), canSplit: false, relay: true});
+        let config = new MoneroTxConfig({accountIndex: 0, address: (await that.wallet.getSubaddress(1, 0)).getAddress(), amount: TestUtils.MAX_FEE, canSplit: false, relay: true});
         await testSendAndUpdateTxs(config);
       });
       
       if (testConfig.testRelays && testConfig.testNotifications && !testConfig.liteMode)
       it("Can update locked, split txs sent from/to different accounts as blocks are added to the chain", async function() {
-        let config = new MoneroTxConfig({accountIndex: 0, address: (await that.wallet.getSubaddress(1, 0)).getAddress(), amount: TestUtils.MAX_FEE, unlockTime: BigInt(await that.daemon.getHeight() + 3), relay: true});
+        let config = new MoneroTxConfig({accountIndex: 0, address: (await that.wallet.getSubaddress(1, 0)).getAddress(), amount: TestUtils.MAX_FEE, relay: true});
         await testSendAndUpdateTxs(config);
       });
       
@@ -4540,11 +4540,11 @@ export default class TestMoneroWalletCommon {
       else assert(found);
       
       // test common attributes
-      let config = ctx.config;
+      let config = ctx.config as MoneroTxConfig;
       assert.equal(tx.getIsConfirmed(), false);
       await testTransfer(tx.getOutgoingTransfer(), ctx);
       assert.equal(tx.getRingSize(), MoneroUtils.RING_SIZE);
-      assert.equal(tx.getUnlockTime().toString(), (config.getUnlockTime() ? config.getUnlockTime() : BigInt(0)).toString());
+      assert.equal(tx.getUnlockTime().toString(), BigInt(0).toString());
       assert.equal(tx.getBlock(), undefined);
       assert(tx.getKey().length > 0);
       assert.equal(typeof tx.getFullHex(), "string");