From 7c636d7ecc239431f15aa3d79157ab4cb99fe278 Mon Sep 17 00:00:00 2001
From: Mike Hearn <hearn@google.com>
Date: Mon, 8 Oct 2012 18:03:50 +0200
Subject: [PATCH] Move block inflation calculator to be a static method of
 Block. In future this will move again to NetworkParameters.

---
 core/src/main/java/com/google/bitcoin/core/Block.java  | 10 ++++++++++
 .../com/google/bitcoin/core/FullPrunedBlockChain.java  |  8 ++------
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/core/src/main/java/com/google/bitcoin/core/Block.java b/core/src/main/java/com/google/bitcoin/core/Block.java
index 73b302e4..1de0b07f 100644
--- a/core/src/main/java/com/google/bitcoin/core/Block.java
+++ b/core/src/main/java/com/google/bitcoin/core/Block.java
@@ -124,6 +124,16 @@ public class Block extends Message {
         super(params, payloadBytes, 0, parseLazy, parseRetain, length);
     }
 
+    /**
+     * A utility method that calculates how much new Bitcoin would be created by the block at the given height.
+     * The inflation of Bitcoin is predictable and drops roughly every 4 years (210,000 blocks). At the dawn of
+     * the system it was 50 coins per block, in late 2012 it went to 25 coins per block, and so on. The size of
+     * a coinbase transaction is inflation plus fees.
+     */
+    public static BigInteger getBlockInflation(int height) {
+        return Utils.toNanoCoins(50, 0).shiftRight(height / 210000);
+    }
+
     private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
         ois.defaultReadObject();
         // This code is not actually necessary, as transient fields are initialized to the default value which is in
diff --git a/core/src/main/java/com/google/bitcoin/core/FullPrunedBlockChain.java b/core/src/main/java/com/google/bitcoin/core/FullPrunedBlockChain.java
index 258f900f..1f51ed5e 100644
--- a/core/src/main/java/com/google/bitcoin/core/FullPrunedBlockChain.java
+++ b/core/src/main/java/com/google/bitcoin/core/FullPrunedBlockChain.java
@@ -179,7 +179,7 @@ public class FullPrunedBlockChain extends AbstractBlockChain {
                     totalFees = totalFees.add(valueIn.subtract(valueOut));
                 }
             }
-            if (totalFees.compareTo(params.MAX_MONEY) > 0 || getBlockInflation(height).add(totalFees).compareTo(coinbaseValue) < 0)
+            if (totalFees.compareTo(params.MAX_MONEY) > 0 || Block.getBlockInflation(height).add(totalFees).compareTo(coinbaseValue) < 0)
                 throw new VerificationException("Transaction fees out of range");
         } catch (VerificationException e) {
             blockStore.abortDatabaseBatchWrite();
@@ -190,10 +190,6 @@ public class FullPrunedBlockChain extends AbstractBlockChain {
         }
         return new TransactionOutputChanges(txOutsCreated, txOutsSpent);
     }
-    
-    private BigInteger getBlockInflation(int height) {
-        return Utils.toNanoCoins(50, 0).shiftRight(height / 210000);
-    }
 
     @Override
     /**
@@ -278,7 +274,7 @@ public class FullPrunedBlockChain extends AbstractBlockChain {
                     }
                 }
                 if (totalFees.compareTo(params.MAX_MONEY) > 0 ||
-                        getBlockInflation(newBlock.getHeight()).add(totalFees).compareTo(coinbaseValue) < 0)
+                        Block.getBlockInflation(newBlock.getHeight()).add(totalFees).compareTo(coinbaseValue) < 0)
                     throw new VerificationException("Transaction fees out of range");
                 txOutChanges = new TransactionOutputChanges(txOutsCreated, txOutsSpent);
             } else {