Merge pull request bitcoin#482 from ImranLorgat/patch-39

Glossary - Bitcoin Mining

glossary.asciidoc

@@ -72,9 +72,10 @@ bitcoin, Bitcoin::
     Depending on context, could refer to the name of the currency unit (the coin), the network or the underlying enabling protocol. Written as bitcoin with a lowercase "b" usually refers to the currency unit. Bitcoin with an uppercase "B" usually refers to the protocol. See https://www.bitcoin.org for general information. The source code can be found at https://github.com/bitcoin/bitcoin.
 
 Bitcoin mining::
-    Bitcoin mining serves two purposes.
-    Firstly, Bitcoin transactions are validated and fixed in the sense that they cannot be double-spent.
-    Secondly, new bitcoin are being created within the coinbase of each block.
+    Bitcoin mining is the process of constructing a block from recent Bitcoin transactions and then solving a computational problem required as Proof of Work.
+    It is the process by which the shared bitcoin ledger (i.e. the bitcoin blockchain) is updated and by which new transactions are included in the ledger.
+    It is also the process by which new bitcoins are issued.
+    Every time a new block is created, the mining node will receive new bitcoins created within the coinbase transaction of that block.
 
 block::
     A grouping of transactions, marked with a timestamp, and a fingerprint of the previous block. The block header is hashed to produce a proof of work, thereby validating the transactions. Valid blocks are added to the main blockchain by network consensus.