diff --git a/packages/taler-wallet-cli/src/bench1.ts b/packages/taler-wallet-cli/src/bench1.ts
index 3f3f752c2..c239a3623 100644
--- a/packages/taler-wallet-cli/src/bench1.ts
+++ b/packages/taler-wallet-cli/src/bench1.ts
@@ -38,7 +38,6 @@ import {
  * set up its own services.
  */
 export async function runBench1(configJson: any): Promise<void> {
-
   const logger = new Logger("Bench1");
 
   // Validate the configuration file for this benchmark.
@@ -53,26 +52,29 @@ export async function runBench1(configJson: any): Promise<void> {
 
   const withdrawAmount = (numDeposits + 1) * 10;
 
-  logger.info(`Starting Benchmark iterations=${numIter} deposits=${numDeposits}`);
+  logger.info(
+    `Starting Benchmark iterations=${numIter} deposits=${numDeposits}`,
+  );
 
   let wallet = {} as Wallet;
 
   for (let i = 0; i < numIter; i++) {
-    // Create a new wallet in each iteration 
-    // otherwise the TPS go down 
-    // my assumption is that the in-memory db file gets too large 
+    // Create a new wallet in each iteration
+    // otherwise the TPS go down
+    // my assumption is that the in-memory db file gets too large
     if (i % restartWallet == 0) {
       if (Object.keys(wallet).length !== 0) {
-	      wallet.stop();
+        wallet.stop();
       }
       wallet = await getDefaultNodeWallet({
         // No persistent DB storage.
         persistentStoragePath: undefined,
         httpLib: myHttpLib,
       });
+      wallet.setInsecureTrustExchange();
       await wallet.client.call(WalletApiOperation.InitWallet, {});
     }
-	
+
     logger.trace(`Starting withdrawal amount=${withdrawAmount}`);
     let start = Date.now();
 
@@ -86,12 +88,13 @@ export async function runBench1(configJson: any): Promise<void> {
       stopWhenDone: true,
     });
 
-    logger.info(`Finished withdrawal amount=${withdrawAmount} time=${Date.now() - start}`);
+    logger.info(
+      `Finished withdrawal amount=${withdrawAmount} time=${Date.now() - start}`,
+    );
 
     for (let i = 0; i < numDeposits; i++) {
-
       logger.trace(`Starting deposit amount=10`);
-      start = Date.now()
+      start = Date.now();
 
       await wallet.client.call(WalletApiOperation.CreateDepositGroup, {
         amount: b1conf.currency + ":10",
diff --git a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
index 621105b63..b5569fadd 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoImplementation.ts
@@ -142,6 +142,21 @@ export interface PrimitiveWorker {
     sig: string;
     pub: string;
   }): Promise<{ valid: boolean }>;
+
+  eddsaSign(req: { msg: string; priv: string }): Promise<{ sig: string }>;
+}
+
+async function myEddsaSign(
+  primitiveWorker: PrimitiveWorker | undefined,
+  req: { msg: string; priv: string },
+): Promise<{ sig: string }> {
+  if (primitiveWorker) {
+    return primitiveWorker.eddsaSign(req);
+  }
+  const sig = eddsaSign(decodeCrock(req.msg), decodeCrock(req.priv));
+  return {
+    sig: encodeCrock(sig),
+  };
 }
 
 export class CryptoImplementation {
@@ -153,13 +168,14 @@ export class CryptoImplementation {
    * Create a pre-coin of the given denomination to be withdrawn from then given
    * reserve.
    */
-  createPlanchet(req: PlanchetCreationRequest): PlanchetCreationResult {
+  async createPlanchet(
+    req: PlanchetCreationRequest,
+  ): Promise<PlanchetCreationResult> {
     if (
       req.denomPub.cipher === DenomKeyType.Rsa ||
       req.denomPub.cipher === DenomKeyType.LegacyRsa
     ) {
       const reservePub = decodeCrock(req.reservePub);
-      const reservePriv = decodeCrock(req.reservePriv);
       const denomPubRsa = decodeCrock(req.denomPub.rsa_public_key);
       const derivedPlanchet = setupWithdrawPlanchet(
         decodeCrock(req.secretSeed),
@@ -180,7 +196,10 @@ export class CryptoImplementation {
         .put(evHash)
         .build();
 
-      const sig = eddsaSign(withdrawRequest, reservePriv);
+      const sigResult = await myEddsaSign(this.primitiveWorker, {
+        msg: encodeCrock(withdrawRequest),
+        priv: req.reservePriv,
+      });
 
       const planchet: PlanchetCreationResult = {
         blindingKey: encodeCrock(derivedPlanchet.bks),
@@ -194,7 +213,7 @@ export class CryptoImplementation {
         },
         denomPubHash: encodeCrock(denomPubHash),
         reservePub: encodeCrock(reservePub),
-        withdrawSig: encodeCrock(sig),
+        withdrawSig: sigResult.sig,
         coinEvHash: encodeCrock(evHash),
       };
       return planchet;
@@ -427,7 +446,9 @@ export class CryptoImplementation {
    * Generate updated coins (to store in the database)
    * and deposit permissions for each given coin.
    */
-  signDepositPermission(depositInfo: DepositInfo): CoinDepositPermission {
+  async signDepositPermission(
+    depositInfo: DepositInfo,
+  ): Promise<CoinDepositPermission> {
     // FIXME: put extensions here if used
     const hExt = new Uint8Array(64);
     let d: Uint8Array;
@@ -460,12 +481,15 @@ export class CryptoImplementation {
     } else {
       throw Error("unsupported exchange protocol version");
     }
-    const coinSig = eddsaSign(d, decodeCrock(depositInfo.coinPriv));
+    const coinSigRes = await myEddsaSign(this.primitiveWorker, {
+      msg: encodeCrock(d),
+      priv: depositInfo.coinPriv,
+    });
 
     if (depositInfo.denomKeyType === DenomKeyType.Rsa) {
       const s: CoinDepositPermission = {
         coin_pub: depositInfo.coinPub,
-        coin_sig: encodeCrock(coinSig),
+        coin_sig: coinSigRes.sig,
         contribution: Amounts.stringify(depositInfo.spendAmount),
         h_denom: depositInfo.denomPubHash,
         exchange_url: depositInfo.exchangeBaseUrl,
@@ -478,7 +502,7 @@ export class CryptoImplementation {
     } else if (depositInfo.denomKeyType === DenomKeyType.LegacyRsa) {
       const s: CoinDepositPermission = {
         coin_pub: depositInfo.coinPub,
-        coin_sig: encodeCrock(coinSig),
+        coin_sig: coinSigRes.sig,
         contribution: Amounts.stringify(depositInfo.spendAmount),
         h_denom: depositInfo.denomPubHash,
         exchange_url: depositInfo.exchangeBaseUrl,
@@ -611,10 +635,13 @@ export class CryptoImplementation {
       .put(decodeCrock(meltCoinPub))
       .build();
 
-    const confirmSig = eddsaSign(confirmData, decodeCrock(meltCoinPriv));
+    const confirmSigResp = await myEddsaSign(this.primitiveWorker, {
+      msg: encodeCrock(confirmData),
+      priv: meltCoinPriv,
+    });
 
     const refreshSession: DerivedRefreshSession = {
-      confirmSig: encodeCrock(confirmSig),
+      confirmSig: confirmSigResp.sig,
       hash: encodeCrock(sessionHash),
       meltCoinPub: meltCoinPub,
       planchetsForGammas: planchetsForGammas,
@@ -641,22 +668,24 @@ export class CryptoImplementation {
     return encodeCrock(hash(decodeCrock(encodedBytes)));
   }
 
-  signCoinLink(
+  async signCoinLink(
     oldCoinPriv: string,
     newDenomHash: string,
     oldCoinPub: string,
     transferPub: string,
     coinEv: string,
-  ): string {
+  ): Promise<string> {
     const coinEvHash = hash(decodeCrock(coinEv));
     const coinLink = buildSigPS(TalerSignaturePurpose.WALLET_COIN_LINK)
       .put(decodeCrock(newDenomHash))
       .put(decodeCrock(transferPub))
       .put(coinEvHash)
       .build();
-    const coinPriv = decodeCrock(oldCoinPriv);
-    const sig = eddsaSign(coinLink, coinPriv);
-    return encodeCrock(sig);
+    const sig = await myEddsaSign(this.primitiveWorker, {
+      msg: encodeCrock(coinLink),
+      priv: oldCoinPriv,
+    });
+    return sig.sig;
   }
 
   benchmark(repetitions: number): BenchmarkResult {
diff --git a/packages/taler-wallet-core/src/crypto/workers/synchronousWorker.ts b/packages/taler-wallet-core/src/crypto/workers/synchronousWorker.ts
index ae8442efd..bfc7ee7a5 100644
--- a/packages/taler-wallet-core/src/crypto/workers/synchronousWorker.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/synchronousWorker.ts
@@ -114,6 +114,16 @@ class MyPrimitiveWorker implements PrimitiveWorker {
       args: req,
     });
   }
+
+  async eddsaSign(req: {
+    msg: string;
+    priv: string;
+  }): Promise<{ sig: string }> {
+    return this.queueRequest({
+      op: "eddsa_sign",
+      args: req,
+    });
+  }
 }
 
 /**
diff --git a/packages/taler-wallet-core/src/wallet.ts b/packages/taler-wallet-core/src/wallet.ts
index 1d809afa8..7e7980795 100644
--- a/packages/taler-wallet-core/src/wallet.ts
+++ b/packages/taler-wallet-core/src/wallet.ts
@@ -942,7 +942,7 @@ async function dispatchRequestInternal(
       }
       const components = pt.targetPath.split("/");
       const creditorAcct = components[components.length - 1];
-      logger.info(`making testbank transfer to '${creditorAcct}''`);
+      logger.info(`making testbank transfer to '${creditorAcct}'`);
       const fbReq = await ws.http.postJson(
         new URL(`${creditorAcct}/admin/add-incoming`, req.bank).href,
         {