CH10: update Full Node section

- Drop everything that says a full node needs a complete copy of the
  blockchain

ch08.asciidoc

@@ -435,44 +435,33 @@ startref="BNextend08")))((("", startref="BNodiscover08")))
 
 === Full Nodes
 
-((("Bitcoin network", "full nodes")))((("full-node
-clients")))((("blockchain (the)", "full blockchain nodes")))Full nodes
-are nodes that maintain a full blockchain with all transactions. More
-accurately, they probably should be called "full blockchain nodes." In
-the early years of Bitcoin, all nodes were full nodes and currently the
-Bitcoin Core client is a full blockchain node. In the past two years,
-however, new forms of Bitcoin clients have been introduced that do not
-maintain a full blockchain but run as lightweight clients. We'll examine
-these in more detail in the next section.
+Full nodes are nodes that verify every transaction in every block on the
+valid block chain with the most proof of work.
 
 ((("blocks", "genesis block")))((("genesis block")))((("blockchain
-(the)", "genesis block")))Full blockchain nodes maintain a complete and
-up-to-date copy of the Bitcoin blockchain with all the transactions,
-which they independently build and verify, starting with the very first
+(the)", "genesis block")))Full nodes
+independently process every block, starting with the very first
 block (genesis block) and building up to the latest known block in the
-network. A full blockchain node can independently and authoritatively
+network. A full node can independently and authoritatively
 verify any transaction without recourse or reliance on any other node or
-source of information. The full blockchain node relies on the network to
+source of information. The full node relies on the network to
 receive updates about new blocks of transactions, which it then verifies
-and incorporates into its local copy of the blockchain.
+and incorporates into its local view of which scripts control which
+Bitcoins, called the set of _unspent transaction outputs_ (UTXOs).
 
-((("Bitcoin nodes", "full nodes")))Running a full blockchain node gives
+((("Bitcoin nodes", "full nodes")))Running a full node gives
 you the pure Bitcoin experience: independent verification of all
 transactions without the need to rely on, or trust, any other systems.
-It's easy to tell if you're running a full node because it requires more
-than one hundred gigabytes of persistent storage (disk space) to store
-the full blockchain. If you need a lot of disk and it takes two to three
-days to sync to the network, you are running a full node. That is the
-price of complete independence and freedom from central authority.
 
 ((("Satoshi client")))There are a few alternative implementations of
-full blockchain Bitcoin clients, built using different programming
-languages and software architectures. However, the most common
-implementation is the reference client Bitcoin Core, also known as the
-Satoshi client. More than 75% of the nodes on the Bitcoin network run
+full nodes, built using different programming
+languages and software architectures, or which made different design
+decisions. However, the most common
+implementation is Bitcoin Core.
+More than 95% of full nodes on the Bitcoin network run
 various versions of Bitcoin Core. It is identified as "Satoshi" in the
 sub-version string sent in the +version+ message and shown by the
-command +getpeerinfo+ as we saw earlier; for example, +/Satoshi:0.8.6/+.
+command +getpeerinfo+ as we saw earlier; for example, +/Satoshi:24.0.1/+.
 
 === Exchanging "Inventory"