--- a/handouts/ho08.tex	Thu Dec 03 13:46:18 2015 +0000
+++ b/handouts/ho08.tex	Tue Jan 05 01:37:31 2016 +0000
@@ -877,3 +877,6 @@
 
 The Bitcoin Backbone Protocol: Analysis and Applications
 https://eprint.iacr.org/2014/765.pdf
+
+Bitcoin book
+http://chimera.labs.oreilly.com/books/1234000001802/ch04.html#public_key_derivation