newbie proofing

sometimes people send money to burned addresses

ch02.asciidoc

@@ -53,7 +53,7 @@ image::images/msbt_0202.png["payment-request"]
 
 [TIP]
 ====
-Try to scan this with your wallet!
+Try to scan this with your wallet to see the address and amount but DO NOT SEND MONEY. 
 ====
 [[payment-request-URL]]
 .The payment request QR code encodes the following URL, defined in BIP-21:

preface.asciidoc

@@ -70,6 +70,18 @@ Some editions of this book are offered under an open source license, such as [CC
 
 If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at pass:[<a href="mailto:permissions@oreilly.com">permissions@oreilly.com</a>].
 
+=== Bitcoin addresses and transactions in this book
+
+The bitcoin addresses, transactions, keys, QR codes and blockchain data used in this book are, for the most part, real. That means you can browse the blockchain, look at the transactions offered as examples, retrieve them with your own scripts or programs, etc.
+
+However, please note that the private keys used to construct addresses are either printed in this book, or have been "burned". That means that if you send money to any of these addresses, the money will either be lost forever, or in some cases everyone who can read the book can take it using the private keys printed in here.
+
+[WARNING]
+====
+DO NOT SEND MONEY TO ANY OF THE ADDRESSES IN THIS BOOK. Your money will be taken by another reader, or lost forever.
+====
+
+
 === Safari® Books Online
 
 [role = "safarienabled"]