diff --git a/NBitcoin/Utils.cs b/NBitcoin/Utils.cs
index 4bbb1028e..0b960a8e8 100644
--- a/NBitcoin/Utils.cs
+++ b/NBitcoin/Utils.cs
@@ -302,7 +302,6 @@ public static IEnumerable<List<T>> Partition<T>(this IEnumerable<T> source, Func
 			}
 		}
 
-#if !NETSTANDARD1X
 		public static int ReadEx(this Stream stream, byte[] buffer, int offset, int count, CancellationToken cancellation = default(CancellationToken))
 		{
 			if (stream == null)
@@ -320,32 +319,7 @@ public static IEnumerable<List<T>> Partition<T>(this IEnumerable<T> source, Func
 
 			while (totalReadCount < count)
 			{
-				cancellation.ThrowIfCancellationRequested();
-
-				int currentReadCount;
-
-				//Big performance problem with BeginRead for other stream types than NetworkStream.
-				//Only take the slow path if cancellation is possible.
-				if (stream is NetworkStream && cancellation.CanBeCanceled)
-				{
-					var ar = stream.BeginRead(buffer, offset + totalReadCount, count - totalReadCount, null, null);
-					if (!ar.CompletedSynchronously)
-					{
-						WaitHandle.WaitAny(new WaitHandle[] { ar.AsyncWaitHandle, cancellation.WaitHandle }, -1);
-					}
-
-					//EndRead might block, so we need to test cancellation before calling it.
-					//This also is a bug because calling EndRead after BeginRead is contractually required.
-					//A potential fix is to use the ReadAsync API. Another fix is to register a callback with BeginRead that calls EndRead in all cases.
-					cancellation.ThrowIfCancellationRequested();
-
-					currentReadCount = stream.EndRead(ar);
-				}
-				else
-				{
-					//IO interruption not supported in this path.
-					currentReadCount = stream.Read(buffer, offset + totalReadCount, count - totalReadCount);
-				}
+				int currentReadCount = stream.ReadAsync(buffer, offset + totalReadCount, count - totalReadCount, cancellation).GetAwaiter().GetResult();
 
 				if (currentReadCount == 0)
 					return 0;
@@ -355,44 +329,6 @@ public static IEnumerable<List<T>> Partition<T>(this IEnumerable<T> source, Func
 
 			return totalReadCount;
 		}
-#else
-
-		public static int ReadEx(this Stream stream, byte[] buffer, int offset, int count, CancellationToken cancellation = default(CancellationToken))
-		{
-			if(stream == null) throw new ArgumentNullException(nameof(stream));
-			if(buffer == null) throw new ArgumentNullException(nameof(buffer));
-			if(offset < 0 || offset > buffer.Length) throw new ArgumentOutOfRangeException("offset");
-			if(count <= 0 || count > buffer.Length) throw new ArgumentOutOfRangeException("count"); //Disallow 0 as a debugging aid.
-			if(offset > buffer.Length - count) throw new ArgumentOutOfRangeException("count");
-
-			//IO interruption not supported on these platforms.
-
-			int totalReadCount = 0;
-#if !NOSOCKET
-			var interruptable = stream is NetworkStream && cancellation.CanBeCanceled;
-#endif
-			while(totalReadCount < count)
-			{
-				cancellation.ThrowIfCancellationRequested();
-				int currentReadCount = 0;
-#if !NOSOCKET
-				if(interruptable)
-				{
-					currentReadCount = stream.ReadAsync(buffer, offset + totalReadCount, count - totalReadCount, cancellation).GetAwaiter().GetResult();
-				}
-				else
-#endif
-				{
-					currentReadCount = stream.Read(buffer, offset + totalReadCount, count - totalReadCount);
-				}
-				if(currentReadCount == 0)
-					return 0;
-				totalReadCount += currentReadCount;
-			}
-
-			return totalReadCount;
-		}
-#endif
 
 #if HAS_SPAN
 		public static int ReadEx(this Stream stream, Span<byte> buffer, CancellationToken cancellation = default(CancellationToken))