Edited ch11_blockchain.adoc with Atlas code editor

ch11_blockchain.adoc

@@ -554,13 +554,13 @@ You might be
 surprised to learn that there is more than one blockchain used with Bitcoin. The
 "main" Bitcoin blockchain, the one created by Satoshi Nakamoto on
 January 3rd, 2009, the one with the genesis block we studied in this
-chapter, is called _mainnet_.  There are other Bitcoin blockchains that
+chapter, is ((("mainnet")))called _mainnet_.  There are other Bitcoin blockchains that
 are used for testing purposes: at this time _testnet_, _signet_, and
 _regtest_. Let's look at each in turn.
 
 ==== Testnet: Bitcoin's Testing Playground
 
-Testnet is the name of the test blockchain, network, and currency that
+Testnet is ((("blockchain", "test blockchains", "testnet", id="blockchain-test-testnet")))((("test blockchains", "testnet", id="test-block-testnet")))((("testnet", id="testnet")))the name of the test blockchain, network, and currency that
 is used for testing purposes. The testnet is a fully featured live P2P
 network, with wallets, test bitcoins (testnet coins), mining, and all
 the other features of mainnet.  The most important difference is that
@@ -661,7 +661,7 @@ incentive, at least in the short term.  Because PoW mining is designed
 to be permissionless, anyone can mine, whether their intention is good
 or not.  That means disruptive miners can create many blocks in a row on
 testnet without including any user transactions.  When those attacks
-happen, testnet becomes unusable for users and developers.
+happen, testnet becomes unusable for users and ((("blockchain", "test blockchains", "testnet", startref="blockchain-test-testnet")))((("test blockchains", "testnet", startref="test-block-testnet")))((("testnet", startref="testnet")))developers.
 
 ==== Signet: The Proof of Authority Testnet