Edited ch02_overview.adoc with Atlas code editor

ch02_overview.adoc

@@ -454,7 +454,7 @@ wallet can further verify Alice's transaction only spends((("transactions", "con
 
 === Bitcoin Mining
 
-Alice's transaction((("bitcoins", "mining", id="bitcoin-mining")))((("mining", id="mining"))) is now propagated on the Bitcoin
+Alice's transaction((("bitcoins", "mining", "operational overview", id="bitcoin-mining-operational-overview")))((("mining", "operational overview", id="mining-operational-overview"))) is now propagated on the Bitcoin
 network. It does not become part of the _blockchain_ until it is
 included in a block by a process called _mining_ and that block has been
 validated by full nodes. See
@@ -510,7 +510,7 @@ valid block something that requires an incredible amount of work to
 create but only a trivial amount of work to verify.  The simple
 verification process is able to probabalistically prove the work was
 done, so the data necessary to generate that proof--in this case, the
-block--is called proof of work (PoW).
+block--is called ((("Proof-of-Work algorithm")))proof of work (PoW).
 
 Transactions are added to the new block, prioritized by the highest fee rate
 transactions first and a few other criteria. Each miner starts the
@@ -586,13 +586,13 @@ giving Bob more and more confidence that Alice's payment is secure.
 
 In <<block-alice1>>,  we can see the block that contains Alice's transaction. Below it are
 hundreds of thousands of blocks, linked to each other in a chain of
-blocks (blockchain) all the way back to block #0, known as the _genesis
+blocks (blockchain) all the way back to block #0, known as((("genesis block"))) the _genesis
 block_. Over time, as the "height" of new blocks increases, so does the
 computation difficulty for the chain as a whole.
 By convention, any block with more than six confirmations
 is considered very hard to change, because it would require an immense amount of
 computation to recalculate six blocks (plus one new block). We will examine
-the process of mining and the way it builds confidence in more ((("bitcoins", "mining", startref="bitcoin-mining")))((("mining", startref="mining")))detail in
+the process of mining and the way it builds confidence in more ((("bitcoins", "mining", "operational overview", startref="bitcoin-mining-operational-overview")))((("mining", "operational overview", startref="mining-operational-overview")))detail in
 <<mining>>.
 
 [[block-alice1]]