Nullable value type may be null.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Nullable value type may be null.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'transaction' in 'Keccak TransactionExtensions.CalculateHash(Transaction transaction)'.

Converting null literal or possible null value to non-nullable type.