diff --git a/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java b/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
index 72c4ef7..c262caf 100644
--- a/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
+++ b/src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java
@@ -348,6 +348,11 @@ public class ECKey {
         return ECKey.fromPublicOnly(point, compressed);
     }
 
+    /** Negate the provided public key */
+    public ECKey negate() {
+        return ECKey.fromPublicOnly(getPubKeyPoint().negate().normalize(), isCompressed());
+    }
+
     /** Add to the private key by the provided private key using modular arithmetic */
     public ECKey addPrivate(ECKey privKey) {
         if(this.priv == null || privKey.priv == null) {
@@ -358,7 +363,7 @@ public class ECKey {
     }
 
     /** Negate the provided private key */
-    public ECKey negate() {
+    public ECKey negatePrivate() {
         if(priv == null) {
             throw new IllegalStateException("Key did not contain a private key");
         }
diff --git a/src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentUtils.java b/src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentUtils.java
index 8b67f65..e30f4bc 100644
--- a/src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentUtils.java
+++ b/src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentUtils.java
@@ -241,7 +241,7 @@ public class SilentPaymentUtils {
             try {
                 ECKey privateKey = walletNode.getWallet().getKeystores().getFirst().getKey(walletNode);
                 if(walletNode.getWallet().getScriptType() == P2TR && !privateKey.getPubKeyPoint().getYCoord().toBigInteger().mod(BigInteger.TWO).equals(BigInteger.ZERO)) {
-                    privateKey = privateKey.negate();
+                    privateKey = privateKey.negatePrivate();
                 }
                 if(summedPrivateKey == null) {
                     summedPrivateKey = privateKey;
@@ -266,8 +266,7 @@ public class SilentPaymentUtils {
 
     public static byte[] getSmallestOutpoint(Set<BlockTransactionHashIndex> outpoints) {
         return outpoints.stream().map(outpoint -> new TransactionOutPoint(outpoint.getHash(), outpoint.getIndex())).map(TransactionOutPoint::bitcoinSerialize)
-                .sorted(new Utils.LexicographicByteArrayComparator())
-                .findFirst().orElseThrow(() -> new IllegalArgumentException("No inputs provided to calculate silent payments input hash"));
+                .min(new Utils.LexicographicByteArrayComparator()).orElseThrow(() -> new IllegalArgumentException("No inputs provided to calculate silent payments input hash"));
     }
 
     public static ECKey getLabelledSpendKey(ECKey scanPrivateKey, ECKey spendPublicKey, int labelIndex) {