new principle for bitcore2

README.md

@@ -30,6 +30,10 @@ conjunction with browserify).
 
 7) Minimize the use of dependencies so that all code can be easily audited.
 
+8) All instance methods modify the state of the object and return the object.
+To access the result of an instance method, you must access the object
+property(s) that it modifies.
+
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 Features over bitcore:
 * Stealth addresses