Describe deviations between the original implementation

Author: pyropy

README.md

@@ -4,4 +4,9 @@ Implementation of [bitstream protocol](https://robinlinus.com/bitstream.pdf) in
 
 # Example usage
 
-You can find an example of how to use this library in the [example](example) directory.
+You can find an example of how to use this library in the [example](example) directory.
+
+# Deviations from the original protocol
+
+- Original protocol uses CompactInt to encode integers, and this implementation uses LittleEndian.
+- Original protocol signs encrypted root + payment hash using Schnorr signature, and this implementation signs encrypted root only.