From 79434212d69f1caaaf23bc7d367124255e6225b6 Mon Sep 17 00:00:00 2001
From: "Andreas M. Antonopoulos" <andreas@antonopoulos.com>
Date: Wed, 14 Mar 2018 10:52:52 -0600
Subject: [PATCH] Errata 163573

---
 ch10.asciidoc | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/ch10.asciidoc b/ch10.asciidoc
index 196fef38..34b54b0e 100644
--- a/ch10.asciidoc
+++ b/ch10.asciidoc
@@ -605,33 +605,40 @@ As you can see, there are a lot of zeros at the beginning of that target, meanin
 
 The formula to calculate the difficulty target from this representation is:
 
-----
-target = coefficient * 2^(8 * (exponent – 3))
-----
+
+target = coefficient * 2^(8*(exponent–3))^
+
 
 Using that formula, and the difficulty bits value 0x1903a30c, we get:
 
-----
-target = 0x03a30c * 2^(0x08 * (0x19 - 0x03))^
 
-=> target = 0x03a30c * 2^(0x08 * 0x16)^
+
+target = 0x03a30c * 2^0x08*(0x19-0x03)^
+
+
+=> target = 0x03a30c * 2^(0x08*0x16)^
+
 
 => target = 0x03a30c * 2^0xB0^
-----
+
 
 which in decimal is:
 
-----
+
+
 => target = 238,348 * 2^176^
 
+
 => target = 22,829,202,948,393,929,850,749,706,076,701,368,331,072,452,018,388,575,715,328
-----
+
 
 switching back to hexadecimal:
 
-----
+
+
 => target = 0x0000000000000003A30C00000000000000000000000000000000000000000000
-----
+
+
 
 This means that a valid block for height 277,316 is one that has a block header hash that is less than the target. In binary that number must have more than 60 leading bits set to zero. With this level of difficulty, a single miner processing 1 trillion hashes per second (1 terahash per second or 1 TH/sec) would only find a solution once every 8,496 blocks or once every 59 days, on average.