diff --git a/example.js b/example.js
index 8a5345f..675809f 100644
--- a/example.js
+++ b/example.js
@@ -24,20 +24,19 @@ function sendToAddress(address, amt) {
 }
 
 /* Run this method and monitor memory usage to check there are no memory leaks */
-function checkMemoryLeak() {
+async function checkMemoryLeak() {
     for (let i = 0; i < 50; i++) {
-        let [wallet, online] = initWallet();
+        let [wallet, online] = await initWallet();
         rgblib.dropOnline(online);
         wallet.drop();
     }
 }
 
-function initWallet(vanillaKeychain) {
+async function initWallet(vanillaKeychain) {
     let bitcoinNetwork = rgblib.BitcoinNetwork.Regtest;
-    let keys = rgblib.generateKeys(bitcoinNetwork);
-    console.log("Keys: " + JSON.stringify(keys));
+    let keys = await rgblib.generateKeys(bitcoinNetwork);
 
-    let restoredKeys = rgblib.restoreKeys(bitcoinNetwork, keys.mnemonic);
+    let restoredKeys = await rgblib.restoreKeys(bitcoinNetwork, keys.mnemonic);
     console.log("Restored keys: " + JSON.stringify(restoredKeys));
 
     let walletData = {
@@ -50,40 +49,49 @@ function initWallet(vanillaKeychain) {
         vanillaKeychain: vanillaKeychain,
     };
     console.log("Creating wallet...");
-    let wallet = new rgblib.Wallet(new rgblib.WalletData(walletData));
+    let wallet = await rgblib.Wallet.createInstance(
+        new rgblib.WalletData(walletData),
+    );
     console.log("Wallet created");
 
-    let btcBalance = wallet.getBtcBalance(null, true);
+    let btcBalance = await wallet.getBtcBalance(null, true);
     console.log("BTC balance: " + JSON.stringify(btcBalance));
 
-    let address = wallet.getAddress();
+    let address = await wallet.getAddress();
     console.log("Address: " + address);
 
     sendToAddress(address, 1);
 
     console.log("Wallet is going online...");
-    let online = wallet.goOnline(false, "tcp://localhost:50001");
+    let online = await wallet.goOnline(false, "tcp://localhost:50001");
     console.log("Wallet went online");
 
-    btcBalance = wallet.getBtcBalance(online, false);
+    btcBalance = await wallet.getBtcBalance(online, false);
     console.log("BTC balance: " + JSON.stringify(btcBalance));
 
-    let created = wallet.createUtxos(online, false, "25", null, "1.0", false);
+    let created = await wallet.createUtxos(
+        online,
+        false,
+        "25",
+        null,
+        "1.0",
+        false,
+    );
     console.log("Created " + created + " UTXOs");
 
     return [wallet, online];
 }
 
-function main() {
-    let [wallet, online] = initWallet(null);
+async function main() {
+    let [wallet, online] = await initWallet(null);
 
-    let asset1 = wallet.issueAssetNIA(online, "USDT", "Tether", "2", [
+    let asset1 = await wallet.issueAssetNIA(online, "USDT", "Tether", "2", [
         "777",
         "66",
     ]);
     console.log("Issued a NIA asset " + JSON.stringify(asset1));
 
-    let asset2 = wallet.issueAssetCFA(
+    let asset2 = await wallet.issueAssetCFA(
         online,
         "Cfa",
         "desc",
@@ -93,7 +101,7 @@ function main() {
     );
     console.log("Issued a CFA asset: " + JSON.stringify(asset2));
 
-    let asset3 = wallet.issueAssetUDA(
+    let asset3 = await wallet.issueAssetUDA(
         online,
         "TKN",
         "Token",
@@ -104,18 +112,18 @@ function main() {
     );
     console.log("Issued a UDA asset: " + JSON.stringify(asset3));
 
-    let assets1 = wallet.listAssets([
+    let assets1 = await wallet.listAssets([
         rgblib.AssetSchema.Nia,
         rgblib.AssetSchema.Cfa,
     ]);
     console.log("Assets: " + JSON.stringify(assets1));
 
-    let assets2 = wallet.listAssets([]);
+    let assets2 = await wallet.listAssets([]);
     console.log("Assets: " + JSON.stringify(assets2));
 
-    let [rcvWallet, rcvOnline] = initWallet("3");
+    let [rcvWallet, rcvOnline] = await initWallet("3");
 
-    let receiveData1 = rcvWallet.blindReceive(
+    let receiveData1 = await rcvWallet.blindReceive(
         null,
         "100",
         null,
@@ -124,7 +132,7 @@ function main() {
     );
     console.log("Receive data: " + JSON.stringify(receiveData1));
 
-    let receiveData2 = rcvWallet.witnessReceive(
+    let receiveData2 = await rcvWallet.witnessReceive(
         null,
         "50",
         "60",
@@ -155,7 +163,7 @@ function main() {
         ],
     };
 
-    let sendResult = wallet.send(
+    let sendResult = await wallet.send(
         online,
         recipientMap,
         false,
@@ -165,41 +173,41 @@ function main() {
     );
     console.log("Sent: " + JSON.stringify(sendResult));
 
-    rcvWallet.refresh(rcvOnline, null, [], false);
-    wallet.refresh(online, null, [], false);
+    await rcvWallet.refresh(rcvOnline, null, [], false);
+    await wallet.refresh(online, null, [], false);
 
     mine(1);
 
-    rcvWallet.refresh(rcvOnline, null, [], false);
-    wallet.refresh(online, null, [], false);
+    await rcvWallet.refresh(rcvOnline, null, [], false);
+    await wallet.refresh(online, null, [], false);
 
-    let rcvAssets = rcvWallet.listAssets([]);
+    let rcvAssets = await rcvWallet.listAssets([]);
     console.log("Assets: " + JSON.stringify(rcvAssets));
 
-    let rcvAssetBalance = rcvWallet.getAssetBalance(asset1.assetId);
+    let rcvAssetBalance = await rcvWallet.getAssetBalance(asset1.assetId);
     console.log("Asset balance: " + JSON.stringify(rcvAssetBalance));
 
-    wallet.sync(online);
+    await wallet.sync(online);
 
-    let transfers = wallet.listTransfers(asset1.assetId);
+    let transfers = await wallet.listTransfers(asset1.assetId);
     console.log("Transfers: " + JSON.stringify(transfers));
 
-    let transactions = wallet.listTransactions(online, true);
+    let transactions = await wallet.listTransactions(online, true);
     console.log("Transactions: " + JSON.stringify(transactions));
 
-    let unspents = rcvWallet.listUnspents(rcvOnline, false, false);
+    let unspents = await rcvWallet.listUnspents(rcvOnline, false, false);
     console.log("Unspents: " + JSON.stringify(unspents));
 
     try {
-        let feeEstimation = wallet.getFeeEstimation(online, "7");
+        let feeEstimation = await wallet.getFeeEstimation(online, "7");
         console.log("Fee estimation: " + JSON.stringify(feeEstimation));
     } catch (e) {
         console.log("Error getting fee estimation: " + e);
     }
 
-    let txid = wallet.sendBtc(
+    let txid = await wallet.sendBtc(
         online,
-        rcvWallet.getAddress(),
+        await rcvWallet.getAddress(),
         "700",
         "1.6",
         false,
diff --git a/swig.i b/swig.i
index 631cd27..a3e513a 100644
--- a/swig.i
+++ b/swig.i
@@ -3,31 +3,35 @@
 #include "./rgb-lib/bindings/c-ffi/rgblib.hpp"
 %}
 
-%typemap(out) CResult %{
+%typemap(out) CResult (v8::Local<v8::Promise::Resolver> resolver) %{
+    resolver = v8::Promise::Resolver::New(v8::Isolate::GetCurrent()->GetCurrentContext()).ToLocalChecked();
     switch ($1.result) {
         case CResultValue::Ok:
-            $result = SWIG_NewPointerObj((new COpaqueStruct(static_cast< const COpaqueStruct& >($1.inner))), SWIGTYPE_p_COpaqueStruct, SWIG_POINTER_OWN |  0 );
+            resolver->Resolve(v8::Isolate::GetCurrent()->GetCurrentContext(), SWIG_NewPointerObj((new COpaqueStruct(static_cast< const COpaqueStruct& >($1.inner))), SWIGTYPE_p_COpaqueStruct, SWIG_POINTER_OWN |  0 )).Check();
             break;
         case CResultValue::Err:
-            SWIG_V8_Raise((const char*) $1.inner.ptr);
+            resolver->Reject(v8::Isolate::GetCurrent()->GetCurrentContext(), v8::String::NewFromUtf8(args.GetIsolate(), (const char*) $1.inner.ptr).ToLocalChecked()).Check();
             break;
     }
+    $result = resolver->GetPromise();
 %}
 
-%typemap(out) CResultString %{
+%typemap(out) CResultString (v8::Local<v8::Promise::Resolver> resolver) %{
+    resolver = v8::Promise::Resolver::New(v8::Isolate::GetCurrent()->GetCurrentContext()).ToLocalChecked();
     switch ($1.result) {
         case CResultValue::Ok:
             if ($1.inner == nullptr) {
-                $result = v8::Null(v8::Isolate::GetCurrent());
+                resolver->Resolve(v8::Isolate::GetCurrent()->GetCurrentContext(), v8::Null(v8::Isolate::GetCurrent())).Check();
             } else {
-                $result = v8::String::NewFromUtf8(args.GetIsolate(), (const char*) $1.inner).ToLocalChecked();
+                resolver->Resolve(v8::Isolate::GetCurrent()->GetCurrentContext(), v8::String::NewFromUtf8(args.GetIsolate(), (const char*) $1.inner).ToLocalChecked()).Check();
                 delete ($1.inner);
             }
             break;
         case CResultValue::Err:
-            SWIG_V8_Raise((const char*) $1.inner);
+            resolver->Reject(v8::Isolate::GetCurrent()->GetCurrentContext(), v8::String::NewFromUtf8(args.GetIsolate(), (const char*) $1.inner).ToLocalChecked()).Check();
             break;
     }
+    $result = resolver->GetPromise();
 %}
 
 
diff --git a/wrapper.js b/wrapper.js
index eed40d0..bad8a03 100644
--- a/wrapper.js
+++ b/wrapper.js
@@ -167,17 +167,17 @@ exports.dropOnline = function dropOnline(online) {
     lib.free_online(online);
 };
 
-exports.generateKeys = function generateKeys(bitcoinNetwork) {
+exports.generateKeys = async function generateKeys(bitcoinNetwork) {
     validateEnumValues(
         { bitcoinNetwork },
         {
             bitcoinNetwork: BitcoinNetwork,
         },
     );
-    return JSON.parse(lib.rgblib_generate_keys(bitcoinNetwork));
+    return JSON.parse(await lib.rgblib_generate_keys(bitcoinNetwork));
 };
 
-exports.restoreKeys = function (bitcoinNetwork, mnemonic) {
+exports.restoreKeys = async function (bitcoinNetwork, mnemonic) {
     validateEnumValues(
         { bitcoinNetwork },
         {
@@ -185,7 +185,7 @@ exports.restoreKeys = function (bitcoinNetwork, mnemonic) {
         },
     );
     validateTypes({ mnemonic }, { mnemonic: "string" });
-    return JSON.parse(lib.rgblib_restore_keys(bitcoinNetwork, mnemonic));
+    return JSON.parse(await lib.rgblib_restore_keys(bitcoinNetwork, mnemonic));
 };
 
 exports.WalletData = class WalletData {
@@ -208,8 +208,13 @@ exports.WalletData = class WalletData {
 };
 
 exports.Wallet = class Wallet {
-    constructor(walletData) {
-        this.wallet = lib.rgblib_new_wallet(JSON.stringify(walletData));
+    constructor(wallet) {
+        this.wallet = wallet;
+    }
+
+    static async createInstance(walletData) {
+        const wallet = await lib.rgblib_new_wallet(JSON.stringify(walletData));
+        return new Wallet(wallet);
     }
 
     drop() {
@@ -217,7 +222,7 @@ exports.Wallet = class Wallet {
         this.wallet = null;
     }
 
-    blindReceive(
+    async blindReceive(
         assetId,
         amount,
         durationSeconds,
@@ -240,7 +245,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_blind_receive(
+            await lib.rgblib_blind_receive(
                 this.wallet,
                 assetId,
                 amount,
@@ -251,7 +256,7 @@ exports.Wallet = class Wallet {
         );
     }
 
-    createUtxos(online, upTo, num, size, feeRate, skipSync) {
+    async createUtxos(online, upTo, num, size, feeRate, skipSync) {
         const params = { online, upTo, num, size, feeRate, skipSync };
         const expectedTypes = {
             online: "object",
@@ -262,7 +267,7 @@ exports.Wallet = class Wallet {
             skipSync: "boolean",
         };
         validateTypes(params, expectedTypes);
-        return lib.rgblib_create_utxos(
+        return await lib.rgblib_create_utxos(
             this.wallet,
             online,
             upTo,
@@ -273,20 +278,22 @@ exports.Wallet = class Wallet {
         );
     }
 
-    getAddress() {
-        return lib.rgblib_get_address(this.wallet);
+    async getAddress() {
+        return await lib.rgblib_get_address(this.wallet);
     }
 
-    getAssetBalance(assetId) {
+    async getAssetBalance(assetId) {
         const params = { assetId };
         const expectedTypes = {
             assetId: "string",
         };
         validateTypes(params, expectedTypes);
-        return JSON.parse(lib.rgblib_get_asset_balance(this.wallet, assetId));
+        return JSON.parse(
+            await lib.rgblib_get_asset_balance(this.wallet, assetId),
+        );
     }
 
-    getBtcBalance(online, skipSync) {
+    async getBtcBalance(online, skipSync) {
         const params = { online, skipSync };
         const expectedTypes = {
             online: "object?",
@@ -294,35 +301,35 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_get_btc_balance(this.wallet, online, skipSync),
+            await lib.rgblib_get_btc_balance(this.wallet, online, skipSync),
         );
     }
 
-    getFeeEstimation(online, blocks) {
+    async getFeeEstimation(online, blocks) {
         const params = { online, blocks };
         const expectedTypes = {
             online: "object",
             blocks: "u16",
         };
         validateTypes(params, expectedTypes);
-        return lib.rgblib_get_fee_estimation(this.wallet, online, blocks);
+        return await lib.rgblib_get_fee_estimation(this.wallet, online, blocks);
     }
 
-    goOnline(skipConsistencyCheck, electrumUrl) {
+    async goOnline(skipConsistencyCheck, electrumUrl) {
         const params = { skipConsistencyCheck, electrumUrl };
         const expectedTypes = {
             skipConsistencyCheck: "boolean",
             electrumUrl: "string",
         };
         validateTypes(params, expectedTypes);
-        return lib.rgblib_go_online(
+        return await lib.rgblib_go_online(
             this.wallet,
             skipConsistencyCheck,
             electrumUrl,
         );
     }
 
-    issueAssetCFA(online, name, details, precision, amounts, filePath) {
+    async issueAssetCFA(online, name, details, precision, amounts, filePath) {
         const params = {
             online,
             name,
@@ -341,7 +348,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_issue_asset_cfa(
+            await lib.rgblib_issue_asset_cfa(
                 this.wallet,
                 online,
                 name,
@@ -353,7 +360,7 @@ exports.Wallet = class Wallet {
         );
     }
 
-    issueAssetNIA(online, ticker, name, precision, amounts) {
+    async issueAssetNIA(online, ticker, name, precision, amounts) {
         const params = {
             online,
             ticker,
@@ -369,7 +376,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_issue_asset_nia(
+            await lib.rgblib_issue_asset_nia(
                 this.wallet,
                 online,
                 ticker,
@@ -380,7 +387,7 @@ exports.Wallet = class Wallet {
         );
     }
 
-    issueAssetUDA(
+    async issueAssetUDA(
         online,
         ticker,
         name,
@@ -409,7 +416,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_issue_asset_uda(
+            await lib.rgblib_issue_asset_uda(
                 this.wallet,
                 online,
                 ticker,
@@ -422,7 +429,7 @@ exports.Wallet = class Wallet {
         );
     }
 
-    listAssets(filterAssetSchemas) {
+    async listAssets(filterAssetSchemas) {
         const params = {
             filterAssetSchemas,
         };
@@ -431,14 +438,14 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_list_assets(
+            await lib.rgblib_list_assets(
                 this.wallet,
                 JSON.stringify(filterAssetSchemas),
             ),
         );
     }
 
-    listTransactions(online, skipSync) {
+    async listTransactions(online, skipSync) {
         const params = { online, skipSync };
         const expectedTypes = {
             online: "object",
@@ -446,11 +453,11 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_list_transactions(this.wallet, online, skipSync),
+            await lib.rgblib_list_transactions(this.wallet, online, skipSync),
         );
     }
 
-    listTransfers(assetId) {
+    async listTransfers(assetId) {
         const params = {
             assetId,
         };
@@ -458,10 +465,12 @@ exports.Wallet = class Wallet {
             assetId: "string",
         };
         validateTypes(params, expectedTypes);
-        return JSON.parse(lib.rgblib_list_transfers(this.wallet, assetId));
+        return JSON.parse(
+            await lib.rgblib_list_transfers(this.wallet, assetId),
+        );
     }
 
-    listUnspents(online, settledOnly, skipSync) {
+    async listUnspents(online, settledOnly, skipSync) {
         const params = {
             online,
             settledOnly,
@@ -474,7 +483,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_list_unspents(
+            await lib.rgblib_list_unspents(
                 this.wallet,
                 online,
                 settledOnly,
@@ -483,7 +492,7 @@ exports.Wallet = class Wallet {
         );
     }
 
-    refresh(online, assetId, filter, skipSync) {
+    async refresh(online, assetId, filter, skipSync) {
         const params = {
             online,
             assetId,
@@ -498,7 +507,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_refresh(
+            await lib.rgblib_refresh(
                 this.wallet,
                 online,
                 assetId,
@@ -508,7 +517,14 @@ exports.Wallet = class Wallet {
         );
     }
 
-    send(online, recipientMap, donation, feeRate, minConfirmations, skipSync) {
+    async send(
+        online,
+        recipientMap,
+        donation,
+        feeRate,
+        minConfirmations,
+        skipSync,
+    ) {
         const params = {
             online,
             recipientMap,
@@ -527,7 +543,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_send(
+            await lib.rgblib_send(
                 this.wallet,
                 online,
                 JSON.stringify(recipientMap),
@@ -539,7 +555,7 @@ exports.Wallet = class Wallet {
         );
     }
 
-    sendBtc(online, address, amount, feeRate, skipSync) {
+    async sendBtc(online, address, amount, feeRate, skipSync) {
         const params = {
             online,
             address,
@@ -555,7 +571,7 @@ exports.Wallet = class Wallet {
             skipSync: "boolean",
         };
         validateTypes(params, expectedTypes);
-        return lib.rgblib_send_btc(
+        return await lib.rgblib_send_btc(
             this.wallet,
             online,
             address,
@@ -565,16 +581,16 @@ exports.Wallet = class Wallet {
         );
     }
 
-    sync(online) {
+    async sync(online) {
         const params = { online };
         const expectedTypes = {
             online: "object",
         };
         validateTypes(params, expectedTypes);
-        lib.rgblib_sync(this.wallet, online);
+        await lib.rgblib_sync(this.wallet, online);
     }
 
-    witnessReceive(
+    async witnessReceive(
         assetId,
         amount,
         durationSeconds,
@@ -597,7 +613,7 @@ exports.Wallet = class Wallet {
         };
         validateTypes(params, expectedTypes);
         return JSON.parse(
-            lib.rgblib_witness_receive(
+            await lib.rgblib_witness_receive(
                 this.wallet,
                 assetId,
                 amount,