Edited ch03_bitcoin-core.adoc with Atlas code editor

ch03_bitcoin-core.adoc

@@ -25,12 +25,12 @@ create and examine data related to the blockchain and network.
 
 === From Bitcoin to Bitcoin Core
 
-Bitcoin is an _open
+Bitcoin ((("Bitcoin Core", "explained", id="bitcoin-core-explain")))is an _open
 source_ project and the source code is available under an open (MIT)
 license, free to download and use for any purpose.  More than just being
 open source, Bitcoin is developed by
 an open community of volunteers. At first, that community consisted of
-only Satoshi Nakamoto. By 2023, Bitcoin's source code had more than 1,000
+only ((("Nakamoto, Satoshi")))Satoshi Nakamoto. By 2023, Bitcoin's source code had more than 1,000
 contributors with about a dozen developers working on the code almost
 full time and several dozen more on a part-time basis. Anyone can
 contribute to the code—including you!
@@ -60,9 +60,9 @@ major parts of the system, the Bitcoin whitepaper describes several
 early parts of the system.  Most major parts of the system since 2011
 have been documented in a set of
 https://oreil.ly/BCXAQ[Bitcoin Improvement
-Proposals (BIPs)].  Throughout this book, we refer to BIP specifications
+Proposals (BIPs)].  Throughout((("Bitcoin Improvement Proposals (BIPs)"))) this book, we refer to BIP specifications
 by their number; for example, BIP9 describes a mechanism used for
-several major upgrades to Bitcoin.
+several major upgrades to((("Bitcoin Core", "explained", startref="bitcoin-core-explain"))) Bitcoin.
 
 === Bitcoin Development Environment