From fb5125ee26b69802c6315582898c2203ffa9f8da Mon Sep 17 00:00:00 2001
From: Carti <carti_it@proton.me>
Date: Sun, 6 Sep 2026 23:23:00 +0200
Subject: [PATCH 1/2] HexEncoder: Optimize `EncodeData` to avoid `byte[]`
 allocations

---
 NBitcoin/DataEncoders/HexEncoder.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/NBitcoin/DataEncoders/HexEncoder.cs b/NBitcoin/DataEncoders/HexEncoder.cs
index ac1ebacfb..9ecef835c 100644
--- a/NBitcoin/DataEncoders/HexEncoder.cs
+++ b/NBitcoin/DataEncoders/HexEncoder.cs
@@ -52,6 +52,14 @@ public class HexEncoder : DataEncoder
 		private static readonly string[] HexTbl = Enumerable.Range(0, 256).Select(v => v.ToString("x2")).ToArray();
 #endif
 
+#if NET8_0_OR_GREATER
+		public override string EncodeData(ReadOnlySpan<byte> data)
+		{
+			// TODO: Convert.ToHexStringLower (.NET 9+) once available.
+			return Convert.ToHexString(data).ToLowerInvariant();
+		}
+#endif
+
 		public override string EncodeData(byte[] data, int offset, int count)
 		{
 			if (data == null)

From f3fc78f2bef639ef0b04f4fca68e3440c04ab133 Mon Sep 17 00:00:00 2001
From: Carti <carti_it@proton.me>
Date: Sun, 6 Sep 2026 23:23:05 +0200
Subject: [PATCH 2/2] Simplify

---
 NBitcoin/Secp256k1/ECPrivKey.cs | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/NBitcoin/Secp256k1/ECPrivKey.cs b/NBitcoin/Secp256k1/ECPrivKey.cs
index 4afd37864..32d0cad8a 100644
--- a/NBitcoin/Secp256k1/ECPrivKey.cs
+++ b/NBitcoin/Secp256k1/ECPrivKey.cs
@@ -298,7 +298,7 @@ public ECPrivKey TweakAdd(ReadOnlySpan<byte> tweak)
 		/// </summary>
 		/// <param name="tweak">32 bytes tweak</param>
 		/// <param name="tweakedPrivKey">False If the tweak is not 32 bytes or if the tweak was out of range (chance of around 1 in 2^128 for uniformly random 32-byte arrays, or if the resulting private key would be invalid(only when the tweak is the complement of the private key)</param>
-		/// <exception cref="System.ObjectDisposedException">This instance has been disposed</exception>
+		/// <exception cref="ObjectDisposedException">This instance has been disposed</exception>
 		/// <returns>A tweaked private key</returns>
 		public bool TryTweakAdd(ReadOnlySpan<byte> tweak, out ECPrivKey? tweakedPrivKey)
 		{
@@ -877,9 +877,8 @@ public bool TryTweakMul(ReadOnlySpan<byte> tweak, out ECPrivKey? tweakedPrivkey)
 			tweakedPrivkey = null;
 			if (tweak.Length != 32)
 				return false;
-			Scalar factor;
-			int overflow;
-			factor = new Scalar(tweak, out overflow);
+
+			var factor = new Scalar(tweak, out int overflow);
 			var sec = this.sec;
 			bool ret = overflow == 0 && secp256k1_eckey_privkey_tweak_mul(ref sec, factor);
 			if (ret)