diff --git a/pom.xml b/pom.xml
index 83249bb..9ed9e96 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
 		<dependency>
 			<groupId>io.horizen</groupId>
 			<artifactId>sidechains-sdk</artifactId>
-			<version>0.3.0</version>
+			<version>0.3.1</version>
 		</dependency>
 
 		<dependency>
diff --git a/src/main/java/io/horizen/lambo/car/proof/SellOrderSpendingProof.java b/src/main/java/io/horizen/lambo/car/proof/SellOrderSpendingProof.java
index ebb1283..4c5ce4d 100644
--- a/src/main/java/io/horizen/lambo/car/proof/SellOrderSpendingProof.java
+++ b/src/main/java/io/horizen/lambo/car/proof/SellOrderSpendingProof.java
@@ -18,7 +18,6 @@
 public final class SellOrderSpendingProof extends AbstractSignature25519<PrivateKey25519, SellOrderProposition> {
     // To distinguish who opened the CarSellOrderBox: seller or buyer
     private final boolean isSeller;
-    private final byte[] signatureBytes;
 
     public static final int SIGNATURE_LENGTH = Ed25519.signatureLength();
 
@@ -28,7 +27,6 @@ public SellOrderSpendingProof(byte[] signatureBytes, boolean isSeller) {
             throw new IllegalArgumentException(String.format("Incorrect signature length, %d expected, %d found", SIGNATURE_LENGTH,
                     signatureBytes.length));
         this.isSeller = isSeller;
-        this.signatureBytes = signatureBytes;
     }
 
     public boolean isSeller() {
@@ -51,25 +49,6 @@ public boolean isValid(SellOrderProposition proposition, byte[] message) {
         }
     }
 
-    @Override
-    public byte[] bytes() {
-        return Bytes.concat(
-                new byte[] { (isSeller ? (byte)1 : (byte)0) },
-                signatureBytes
-        );
-    }
-
-    public static SellOrderSpendingProof parseBytes(byte[] bytes) {
-        int offset = 0;
-
-        boolean isSeller = bytes[offset] != 0;
-        offset += 1;
-
-        byte[] signatureBytes = Arrays.copyOfRange(bytes, offset, offset + SIGNATURE_LENGTH);
-
-        return new SellOrderSpendingProof(signatureBytes, isSeller);
-    }
-
     @Override
     public ProofSerializer serializer() {
         return SellOrderSpendingProofSerializer.getSerializer();