diff --git a/src/main/java/io/bitsquare/btc/WalletFacade.java b/src/main/java/io/bitsquare/btc/WalletFacade.java
index 51a76816a9..ca85ed96ab 100644
--- a/src/main/java/io/bitsquare/btc/WalletFacade.java
+++ b/src/main/java/io/bitsquare/btc/WalletFacade.java
@@ -33,6 +33,8 @@ import javax.inject.Inject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static com.google.bitcoin.script.ScriptOpCodes.OP_RETURN;
+
 /**
  * TODO: use walletextension (with protobuffer) instead of saving addressEntryList via storage
  * TODO: use HD wallet features instead of addressEntryList
@@ -605,9 +607,8 @@ public class WalletFacade
 
         Transaction tx = new Transaction(params);
 
-        //TODO priv key is null, use other signing key or find out why it is null at that moment
-        //byte[] data = cryptoFacade.getEmbeddedAccountRegistrationData(getRegistrationAddressInfo().getKey(), stringifiedBankAccounts);
-        //tx.addOutput(Transaction.MIN_NONDUST_OUTPUT, new ScriptBuilder().op(OP_RETURN).data(data).build());
+        byte[] data = cryptoFacade.getEmbeddedAccountRegistrationData(getRegistrationAddressInfo().getKey(), stringifiedBankAccounts);
+        tx.addOutput(Transaction.MIN_NONDUST_OUTPUT, new ScriptBuilder().op(OP_RETURN).data(data).build());
 
         Coin fee = FeePolicy.ACCOUNT_REGISTRATION_FEE.subtract(Transaction.MIN_NONDUST_OUTPUT).subtract(FeePolicy.TX_FEE);
         log.trace("fee: " + fee.toFriendlyString());
diff --git a/src/main/java/io/bitsquare/crypto/CryptoFacade.java b/src/main/java/io/bitsquare/crypto/CryptoFacade.java
index 082dc82339..c0edb4db58 100644
--- a/src/main/java/io/bitsquare/crypto/CryptoFacade.java
+++ b/src/main/java/io/bitsquare/crypto/CryptoFacade.java
@@ -1,12 +1,18 @@
 package io.bitsquare.crypto;
 
 import com.google.bitcoin.core.ECKey;
+import com.google.bitcoin.core.Sha256Hash;
 import com.google.bitcoin.core.Utils;
+import com.google.bitcoin.crypto.KeyCrypterException;
 import com.google.common.base.Charsets;
+import java.nio.charset.Charset;
 import java.security.SignatureException;
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.spongycastle.crypto.params.KeyParameter;
+import org.spongycastle.util.encoders.Base64;
 
 /**
  * That facade delivers crypto functionality from the bitcoinJ library
@@ -21,16 +27,42 @@ public class CryptoFacade
     {
     }
 
+    // DeterministicKey does not support signMessage yet.
+    private String signMessage(ECKey key, String message, @Nullable KeyParameter aesKey) throws KeyCrypterException
+    {
+        byte[] data = Utils.formatMessageForSigning(message);
+        Sha256Hash hash = Sha256Hash.createDouble(data);
+        ECKey.ECDSASignature sig = key.sign(hash, aesKey);
+        // Now we have to work backwards to figure out the recId needed to recover the signature.
+        int recId = -1;
+        for (int i = 0; i < 4; i++)
+        {
+            ECKey k = ECKey.recoverFromSignature(i, sig, hash, key.isCompressed());
+            if (k != null && k.getPubKeyPoint().equals(key.getPubKeyPoint()))
+            {
+                recId = i;
+                break;
+            }
+        }
+        if (recId == -1)
+            throw new RuntimeException("Could not construct a recoverable key. This should never happen.");
+        int headerByte = recId + 27 + (key.isCompressed() ? 4 : 0);
+        byte[] sigData = new byte[65];  // 1 header + 32 bytes for R + 32 bytes for S
+        sigData[0] = (byte) headerByte;
+        System.arraycopy(Utils.bigIntegerToBytes(sig.r, 32), 0, sigData, 1, 32);
+        System.arraycopy(Utils.bigIntegerToBytes(sig.s, 32), 0, sigData, 33, 32);
+        return new String(Base64.encode(sigData), Charset.forName("UTF-8"));
+    }
 
     public byte[] getEmbeddedAccountRegistrationData(ECKey registrationKey, String stringifiedBankAccounts)
     {
-        String signedBankAccountIDs = registrationKey.signMessage(stringifiedBankAccounts);
+        String signedBankAccountIDs = signMessage(registrationKey, stringifiedBankAccounts, null);
         return Utils.sha256hash160(concatenateChunks(stringifiedBankAccounts, signedBankAccountIDs).getBytes(Charsets.UTF_8));
     }
 
     public String signContract(ECKey key, String contractAsJson)
     {
-        return key.signMessage(contractAsJson);
+        return signMessage(key, contractAsJson, null);
     }
 
     //   registration
@@ -38,7 +70,7 @@ public class CryptoFacade
     {
         try
         {
-            ECKey key = new ECKey(null, pubKey, true);
+            ECKey key = ECKey.fromPublicOnly(pubKey);
             key.verifyMessage(msg, sig);
             return true;
         } catch (SignatureException e)
diff --git a/src/main/java/io/bitsquare/gui/arbitrators/registration/ArbitratorRegistrationView.fxml b/src/main/java/io/bitsquare/gui/arbitrators/registration/ArbitratorRegistrationView.fxml
index b041edc628..0ddd7ffff5 100644
--- a/src/main/java/io/bitsquare/gui/arbitrators/registration/ArbitratorRegistrationView.fxml
+++ b/src/main/java/io/bitsquare/gui/arbitrators/registration/ArbitratorRegistrationView.fxml
@@ -26,19 +26,19 @@
                     <Button onAction="#onClearLanguages" text="Clear" GridPane.columnIndex="2" GridPane.rowIndex="2"/>
                     <ComboBox fx:id="languageComboBox" onAction="#onAddLanguage" prefWidth="150.0" promptText="Add language" GridPane.columnIndex="3" GridPane.rowIndex="2"/>
 
-                    <Label text="Max. trade volume (BTC):" GridPane.rowIndex="3"/>
+                    <Label text="Max. trade volume:" GridPane.rowIndex="3"/>
                     <TextField fx:id="maxTradeVolumeTextField" promptText="Recommended: 0.1 - 2 BTC" GridPane.columnIndex="1" GridPane.rowIndex="3" GridPane.columnSpan="3"/>
 
                     <Label text="Passive service fee (%):" GridPane.rowIndex="4"/>
                     <TextField fx:id="passiveServiceFeeTextField" promptText="Recommended: 0.1 - 1%" GridPane.columnIndex="1" GridPane.rowIndex="4" GridPane.columnSpan="3"/>
 
-                    <Label text="Min. passive service fee (BTC)" GridPane.rowIndex="5"/>
+                    <Label text="Min. passive service fee" GridPane.rowIndex="5"/>
                     <TextField fx:id="minPassiveServiceFeeTextField" promptText="Recommended: 0.0001 - 0.005 BTC" GridPane.columnIndex="1" GridPane.rowIndex="5" GridPane.columnSpan="3"/>
 
                     <Label text="Arbitration fee (%):" GridPane.rowIndex="6"/>
                     <TextField fx:id="arbitrationFeeTextField" promptText="Recommended: 5 - 20 %" GridPane.columnIndex="1" GridPane.rowIndex="6" GridPane.columnSpan="3"/>
 
-                    <Label text="Min. arbitration fee (BTC):" GridPane.rowIndex="7"/>
+                    <Label text="Min. arbitration fee:" GridPane.rowIndex="7"/>
                     <TextField fx:id="minArbitrationFeeTextField" promptText="Recommended: 0.1 - 0.2 BTC" GridPane.columnIndex="1" GridPane.rowIndex="7" GridPane.columnSpan="3"/>
 
                     <Label text="Method(s) used for arbitration:" GridPane.rowIndex="8"/>
diff --git a/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferController.java b/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferController.java
index 479017c4c3..bfce9fcc83 100644
--- a/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferController.java
+++ b/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferController.java
@@ -214,7 +214,7 @@ public class CreateOfferController implements Initializable, ChildController, Hi
         if (user.getCurrentBankAccount() != null)
         {
             Coin amountAsCoin = BitSquareFormatter.parseBtcToCoin(getAmountString());
-            Coin minAmountAsCoin = BitSquareFormatter.parseBtcToCoin(getAmountString());
+            Coin minAmountAsCoin = BitSquareFormatter.parseBtcToCoin(getMinAmountString());
 
             offer = new Offer(user.getMessagePublicKey(),
                               direction,
@@ -354,6 +354,18 @@ public class CreateOfferController implements Initializable, ChildController, Hi
         }
     }
 
+    private String getMinAmountString()
+    {
+        try
+        {
+            BitSquareValidator.textFieldsHasPositiveDoubleValueWithReset(minAmountTextField);
+            return minAmountTextField.getText();
+        } catch (BitSquareValidator.ValidationException e)
+        {
+            return "0";
+        }
+    }
+
     private double getCollateral()
     {
         // TODO
diff --git a/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferView.fxml b/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferView.fxml
index 7bb299d324..6db240da5e 100644
--- a/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferView.fxml
+++ b/src/main/java/io/bitsquare/gui/market/createOffer/CreateOfferView.fxml
@@ -24,7 +24,7 @@
             <Label text="EUR in total"/>
         </HBox>
 
-        <Label text="Min. Amount:" GridPane.rowIndex="2"/>
+        <Label text="Min. Amount (BTC):" GridPane.rowIndex="2"/>
         <TextField fx:id="minAmountTextField" GridPane.columnIndex="1" GridPane.rowIndex="2"/>
 
         <Label fx:id="collateralLabel" text="Collateral:" GridPane.rowIndex="3"/>
diff --git a/src/main/java/io/bitsquare/gui/market/orderbook/OrderBookListItem.java b/src/main/java/io/bitsquare/gui/market/orderbook/OrderBookListItem.java
index 0f4354b037..81007d93f2 100644
--- a/src/main/java/io/bitsquare/gui/market/orderbook/OrderBookListItem.java
+++ b/src/main/java/io/bitsquare/gui/market/orderbook/OrderBookListItem.java
@@ -20,7 +20,7 @@ public class OrderBookListItem
         this.offer = offer;
         this.price.set(BitSquareFormatter.formatPrice(offer.getPrice()));
         this.amount.set(BitSquareFormatter.formatCoinToBtc(offer.getAmount()) + " (" + BitSquareFormatter.formatCoinToBtc(offer.getMinAmount()) + ")");
-        this.volume.set(BitSquareFormatter.formatVolumeWithMinVolume(offer.getVolume(), offer.getMinVolume()));
+        this.volume.set(BitSquareFormatter.formatVolumeWithMinVolume(offer.getOfferVolume(), offer.getMinOfferVolume()));
     }
 
 
diff --git a/src/main/java/io/bitsquare/gui/market/trade/TakeOfferView.fxml b/src/main/java/io/bitsquare/gui/market/trade/TakeOfferView.fxml
index 4f5c17dd21..21753333e7 100644
--- a/src/main/java/io/bitsquare/gui/market/trade/TakeOfferView.fxml
+++ b/src/main/java/io/bitsquare/gui/market/trade/TakeOfferView.fxml
@@ -18,7 +18,7 @@
 
                         <Label text="Take offer:" id="form-header-text"/>
 
-                        <Label text="Amount (BTC):" GridPane.rowIndex="1"/>
+                        <Label text="Amount:" GridPane.rowIndex="1"/>
                         <ValidatedTextField fx:id="amountTextField" GridPane.rowIndex="1" GridPane.columnIndex="1"/>
 
                         <Label text="Price (EUR/BTC):" GridPane.rowIndex="2"/>
@@ -122,7 +122,7 @@
 
                     <Label text="Trade completed" id="form-header-text"/>
 
-                    <Label text="You have sold (BTC):" GridPane.rowIndex="2"/>
+                    <Label text="You have sold:" GridPane.rowIndex="2"/>
                     <ValidatedTextField fx:id="summaryPaidTextField" GridPane.rowIndex="2" GridPane.columnIndex="1"/>
 
                     <Label text="You have received (EUR):" GridPane.rowIndex="3"/>
@@ -133,7 +133,7 @@
                     <Label text="Total fees (take offer fee + tx fee):" GridPane.rowIndex="5"/>
                     <TextField fx:id="summaryFeesTextField" editable="false" GridPane.rowIndex="5" GridPane.columnIndex="1"/>
 
-                    <Label text="Refunded collateral (BTC):" GridPane.rowIndex="6"/>
+                    <Label text="Refunded collateral:" GridPane.rowIndex="6"/>
                     <TextField fx:id="summaryCollateralTextField" editable="false" GridPane.rowIndex="6" GridPane.columnIndex="1"/>
 
                     <Label text="Deposit transaction ID:" GridPane.rowIndex="7"/>
diff --git a/src/main/java/io/bitsquare/gui/market/trade/TakerOfferController.java b/src/main/java/io/bitsquare/gui/market/trade/TakerOfferController.java
index 595d658ac4..30b8ef143b 100644
--- a/src/main/java/io/bitsquare/gui/market/trade/TakerOfferController.java
+++ b/src/main/java/io/bitsquare/gui/market/trade/TakerOfferController.java
@@ -200,8 +200,9 @@ public class TakerOfferController implements Initializable, ChildController
                 public void onPayoutTxPublished(Trade trade, String payoutTxId)
                 {
                     accordion.setExpandedPane(summaryTitledPane);
+
                     summaryPaidTextField.setText(BitSquareFormatter.formatCoinToBtcWithCode(trade.getTradeAmount()));
-                    summaryReceivedTextField.setText(BitSquareFormatter.formatVolume(trade.getOffer().getPrice() * trade.getTradeAmount().value));
+                    summaryReceivedTextField.setText(BitSquareFormatter.formatVolume(trade.getTradeVolume()));
                     summaryFeesTextField.setText(BitSquareFormatter.formatCoinToBtcWithCode(FeePolicy.TAKE_OFFER_FEE.add(FeePolicy.TX_FEE)));
                     summaryCollateralTextField.setText(BitSquareFormatter.formatCoinToBtcWithCode(trade.getCollateralAmount()));
                     summaryDepositTxIdTextField.setText(depositTxId);
diff --git a/src/main/java/io/bitsquare/gui/orders/offer/OfferListItem.java b/src/main/java/io/bitsquare/gui/orders/offer/OfferListItem.java
index 231e1001f5..10ff9a8760 100644
--- a/src/main/java/io/bitsquare/gui/orders/offer/OfferListItem.java
+++ b/src/main/java/io/bitsquare/gui/orders/offer/OfferListItem.java
@@ -23,7 +23,7 @@ public class OfferListItem
         this.price.set(BitSquareFormatter.formatPrice(offer.getPrice()));
 
         this.amount.set(BitSquareFormatter.formatCoinToBtc(offer.getAmount()) + " (" + BitSquareFormatter.formatCoinToBtc(offer.getMinAmount()) + ")");
-        this.volume.set(BitSquareFormatter.formatVolumeWithMinVolume(offer.getVolume(), offer.getMinVolume()));
+        this.volume.set(BitSquareFormatter.formatVolumeWithMinVolume(offer.getOfferVolume(), offer.getMinOfferVolume()));
         this.offerId = offer.getId();
     }
 
diff --git a/src/main/java/io/bitsquare/gui/orders/pending/PendingTradeController.java b/src/main/java/io/bitsquare/gui/orders/pending/PendingTradeController.java
index 632901a80e..ea9079102f 100644
--- a/src/main/java/io/bitsquare/gui/orders/pending/PendingTradeController.java
+++ b/src/main/java/io/bitsquare/gui/orders/pending/PendingTradeController.java
@@ -292,16 +292,13 @@ public class PendingTradeController implements Initializable, ChildController, H
             txTitleLabel.setText("Payout transaction ID:");
 
             bankAccountDetailsHeaderLabel.setText("Summary");
-            bankAccountTypeTitleLabel.setText("You have bought (BTC):");
+            bankAccountTypeTitleLabel.setText("You have bought:");
             holderNameTitleLabel.setText("You have payed (" + trade.getOffer().getCurrency() + "):");
             primaryBankAccountIDTitleLabel.setText("Total fees (offer fee + tx fee):");
             secondaryBankAccountIDTitleLabel.setText("Refunded collateral:");
 
-            //TODO
-            String fiatPayed = BitSquareFormatter.formatVolume(trade.getOffer().getPrice() * trade.getTradeAmount().value);
-
             bankAccountTypeTextField.setText(BitSquareFormatter.formatCoinToBtcWithCode(trade.getTradeAmount()));
-            holderNameTextField.setText(fiatPayed);
+            holderNameTextField.setText(BitSquareFormatter.formatVolume(trade.getTradeVolume()));
             primaryBankAccountIDTextField.setText(BitSquareFormatter.formatCoinToBtcWithCode(FeePolicy.CREATE_OFFER_FEE.add(FeePolicy.TX_FEE)));
             secondaryBankAccountIDTextField.setText(BitSquareFormatter.formatCoinToBtcWithCode(trade.getCollateralAmount()));
 
diff --git a/src/main/java/io/bitsquare/trade/Offer.java b/src/main/java/io/bitsquare/trade/Offer.java
index 52bd41e767..968b99b4af 100644
--- a/src/main/java/io/bitsquare/trade/Offer.java
+++ b/src/main/java/io/bitsquare/trade/Offer.java
@@ -5,6 +5,7 @@ import io.bitsquare.bank.BankAccountType;
 import io.bitsquare.locale.Country;
 import io.bitsquare.user.Arbitrator;
 import java.io.Serializable;
+import java.math.BigDecimal;
 import java.security.PublicKey;
 import java.util.*;
 
@@ -23,6 +24,7 @@ public class Offer implements Serializable
     private final double price;
     private final Coin amount;
     private final Coin minAmount;
+    //TODO use hex string
     private final PublicKey messagePublicKey;
     private final BankAccountType bankAccountType;
     private final Country bankAccountCountry;
@@ -137,14 +139,21 @@ public class Offer implements Serializable
         return acceptedLanguageLocales;
     }
 
-    public double getVolume()
+    public double getVolumeForCoin(Coin coin)
     {
-        return price * amount.value;
+        BigDecimal amountBD = BigDecimal.valueOf(coin.longValue());
+        BigDecimal volumeBD = amountBD.multiply(BigDecimal.valueOf(price));
+        return volumeBD.divide(BigDecimal.valueOf(Coin.COIN.value)).doubleValue();
     }
 
-    public double getMinVolume()
+    public double getOfferVolume()
     {
-        return price * minAmount.value;
+        return getVolumeForCoin(amount);
+    }
+
+    public double getMinOfferVolume()
+    {
+        return getVolumeForCoin(minAmount);
     }
 
     public String getOfferFeePaymentTxID()
diff --git a/src/main/java/io/bitsquare/trade/Trade.java b/src/main/java/io/bitsquare/trade/Trade.java
index 097963abe9..bcd7168d50 100644
--- a/src/main/java/io/bitsquare/trade/Trade.java
+++ b/src/main/java/io/bitsquare/trade/Trade.java
@@ -38,6 +38,10 @@ public class Trade implements Serializable
         _stateChangedProperty = new SimpleStringProperty();
     }
 
+    public double getTradeVolume()
+    {
+        return offer.getVolumeForCoin(tradeAmount);
+    }
 
     ///////////////////////////////////////////////////////////////////////////////////////////
     // Setters
diff --git a/src/main/java/io/bitsquare/trade/protocol/offerer/VerifyAndSignContract.java b/src/main/java/io/bitsquare/trade/protocol/offerer/VerifyAndSignContract.java
index 77a44bc32c..3cfddd18e3 100644
--- a/src/main/java/io/bitsquare/trade/protocol/offerer/VerifyAndSignContract.java
+++ b/src/main/java/io/bitsquare/trade/protocol/offerer/VerifyAndSignContract.java
@@ -39,16 +39,13 @@ public class VerifyAndSignContract
         // log.trace("Offerers contractAsJson: " + contractAsJson);
         // log.trace("Takers contractAsJson: " + sharedModel.peersContractAsJson);
 
-        //TODO not matching yet due refactoring...
-       /* if (contractAsJson.equals(peersContractAsJson))
-        { */
-        log.trace("The 2 contracts as json does match");
-        //String signature = cryptoFacade.signContract(registrationKey, contractAsJson);
-        String signature = "TODO";
-        //log.trace("signature: " + signature);
-
-        resultHandler.onResult(contract, contractAsJson, signature);
-       /* }
+        if (contractAsJson.equals(peersContractAsJson))
+        {
+            log.trace("The 2 contracts as json does match");
+            String signature = cryptoFacade.signContract(registrationKey, contractAsJson);
+            //log.trace("signature: " + signature);
+            resultHandler.onResult(contract, contractAsJson, signature);
+        }
         else
         {
             // TODO use diff output as feedback ?
@@ -57,7 +54,7 @@ public class VerifyAndSignContract
             log.error("Takers contractAsJson: " + peersContractAsJson);
 
             faultHandler.onFault(new Exception("Contracts are not matching"));
-        }  */
+        }
     }
 
     public interface ResultHandler
diff --git a/src/main/java/io/bitsquare/trade/protocol/taker/CreateAndSignContract.java b/src/main/java/io/bitsquare/trade/protocol/taker/CreateAndSignContract.java
index 983cd2055c..cec5a3a1ac 100644
--- a/src/main/java/io/bitsquare/trade/protocol/taker/CreateAndSignContract.java
+++ b/src/main/java/io/bitsquare/trade/protocol/taker/CreateAndSignContract.java
@@ -36,9 +36,7 @@ public class CreateAndSignContract
             Contract contract = new Contract(offer, tradeAmount, takeOfferFeeTxId, peersAccountId, accountId, peersBankAccount, bankAccount, peersMessagePublicKey, messagePublicKey);
 
             String contractAsJson = Utilities.objectToJson(contract);
-            //TODO priv key is null, use other signing key or find out why it is null at that moment
-            // String signature = cryptoFacade.signContract(registrationKey, contractAsJson);
-            String signature = "TODO priv key is null, use other signing key or find out why it is null at that moment";
+            String signature = cryptoFacade.signContract(registrationKey, contractAsJson);
             resultHandler.onResult(contract, contractAsJson, signature);
         } catch (Throwable t)
         {