diff --git a/contrib/hush_supply b/contrib/hush_supply
index 99659f219..f7813c64d 100755
--- a/contrib/hush_supply
+++ b/contrib/hush_supply
@@ -5,42 +5,52 @@ use warnings;
 use strict;
 
 # Simulate the total supply on Hush v3 mainnet
+# Todo: track FR
+# Todo: verify FR off-by-one
 
 my $supply   = 0.0;
-my $block    = 0;
-my $satoshis = 100_000_000;
-my $reward0  = int(12.5*$satoshis);
+my $block    = 0; # Block 0 in Hush Smart chains is the BTC genesis block
+my $puposhis = 100_000_000;
+my $reward0  = 1_250_000_000;
 my $halvings = 0;
-my $initial  = 6178674 * $satoshis;
+my $initial  = 6178674 * $puposhis;
 my $interval = 1_640_000; # 4 years of 75s blocks
-my $height   = shift || -1;
+my $stop     = shift || -1;
+my $totalfr  = 0; # total paid out to FR address
+my $reward   = $reward0;
 
 # Usage: ./hush_supply  &> supply.csv
 #        ./hush_supply HEIGHT &> supply.csv # stop at HEIGHT
 
-my $reward = $reward0;
+printf "# block, supply, reward, fr, totalfr, halvings\n";
+
 # We know BR will go to zero between 7 and 8th halvings
 while ($halvings <= 10) {
     $block++;
+    my $fr = 0;
     # blocks 2-127 of Hush v3 had BR=0
     if ($block == 1) {
         $reward = $initial; # airdropped funds from Hush v2 mainnet
     } elsif ($block > 1 && $block < 128) {
         $reward = 0; # blocks 2-127 have BR=0
     } else {
+        $fr = 125_000_000;
         if ($block < 340_000) {
             $reward = $reward0;
         } else {
+            my $shifted = $block - 340_000;
             # Past the first halving
-            $block -= 340_000;
-            $halvings = 1 + ($block % $interval);
-            $reward <<= $halvings;
+            $halvings = 1 + int ($shifted / $interval);
+            if ($shifted % 840_000 == 0) {
+                $reward >>= 2;
+                $fr     >>= 2;
+            }
         }
     }
-    $supply += $reward;
-    # block, current supply, block reward amount, number of halvings
-    # all amounts are in satoshis
-    printf "%s,%s,%s,%s\n",$block, $supply, $reward, $halvings;
-    #exit(0) if ($block > 200);
-    exit(0) if $block == $height;
+    $supply  += $reward;
+    $totalfr += $fr;
+
+    # block, current supply, block reward amount, number of halvings, all amounts are in puposhis
+    printf "%d,%d,%d,%d,%d,%d\n", $block, $supply, $reward, $fr, $totalfr, $halvings;
+    exit(0) if $block == $stop;
 }