Edited ch04.asciidoc with Atlas code editor

ch04.asciidoc

@@ -443,7 +443,6 @@ K = 04F028892BAD7ED57D2FB57BF33081D5CFCF6F9ED3D3D7F159C2E2FFF579DC341A↵
 ++++
 
 [[comp_pub]]
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 ===== Compressed public keys
 
 ((("public and private keys", "compressed public keys")))Compressed public keys were introduced to bitcoin to reduce the size of transactions and conserve disk space on nodes that store the bitcoin blockchain database. Most transactions include the public key, which is required to validate the owner's credentials and spend the bitcoin. Each public key requires 520 bits (prefix + x + y), which when multiplied by several hundred transactions per block, or tens of thousands of transactions per day, adds a significant amount of data to the blockchain.
@@ -531,7 +530,7 @@ Address: 1PRTTaJesdNovgne6Ehcdu1fpEdX7913CK
 
 [TIP]
 ====
-The example in <<addr_example_run>>, produces a bitcoin address (+1PRTT...+) from a _compressed_ public key (see <<comp_pub>>). If you used the uncompressed public key instead, it would produce a different bitcoin address (+14K1y...+).
+The code in <<addr_example_run>> produces a bitcoin address (+1PRTT...+) from a _compressed_ public key (see <<comp_pub>>). If you used the uncompressed public key instead, it would produce a different bitcoin address (+14K1y...+).
 ====
 
 === Implementing Keys and Addresses in Python