Edited ch11_blockchain.adoc with Atlas code editor

ch11_blockchain.adoc

@@ -357,7 +357,7 @@ image::images/mbc3_1101.png[]
 [[merkle_trees]]
 === Merkle Trees
 
-Each block in the Bitcoin blockchain contains
+Each block((("blockchain", "merkle trees", id="blockchain-merkle")))((("merkle trees", id="merkle-tree-explain"))) in the Bitcoin blockchain contains
 a summary of all the transactions in the block using a _merkle tree_.
 
 A _merkle tree_, also known
@@ -546,7 +546,7 @@ and block, and between the block and blockchain, proves that the
 transaction is recorded in the blockchain. All in all, the lightweight client will
 have received less than a kilobyte of data for the block header and
 merkle path, an amount of data that is more than a thousand times less
-than a full block (about 2 megabytes currently).
+than a full block (about 2 megabytes ((("blockchain", "merkle trees", startref="blockchain-merkle")))((("merkle trees", startref="merkle-tree-explain")))currently).
 
 === Bitcoin's Test Blockchains