From 35bbe110554e3166cc64a82b016b0e4be7b3979f Mon Sep 17 00:00:00 2001
From: Daniel Cousens <github@dcousens.com>
Date: Tue, 28 Mar 2017 20:28:48 +1100
Subject: [PATCH] block: change exponent offset to avoid subtraction

---
 src/block.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/block.js b/src/block.js
index 66aafbc..6e82c75 100644
--- a/src/block.js
+++ b/src/block.js
@@ -131,11 +131,11 @@ Block.prototype.toHex = function (headersOnly) {
 Block.calculateTarget = function (bits) {
   var exponent = ((bits & 0xff000000) >> 24) - 3
   var mantissa = bits & 0x007fffff
-  var i = 31 - exponent
+  var i = 28 - exponent
 
   var target = new Buffer(32)
   target.fill(0)
-  target.writeUInt32BE(mantissa, i - 3)
+  target.writeUInt32BE(mantissa, i)
   return target
 }