From 25c026e060b4c80c8311474a26259d83c94bc6dd Mon Sep 17 00:00:00 2001
From: Roy Lee <roylee17@gmail.com>
Date: Tue, 12 Jun 2018 21:11:42 -0700
Subject: [PATCH] [lbry] blockchain: change Block Subsidy algorithm
---
blockchain/validate.go | 40 +++++++++++++++++++++++++++++++++++-----
1 file changed, 35 insertions(+), 5 deletions(-)
diff --git a/blockchain/validate.go b/blockchain/validate.go
index f7831469..2fd5d7fd 100644
--- a/blockchain/validate.go
+++ b/blockchain/validate.go
@@ -40,7 +40,7 @@ const (
// baseSubsidy is the starting subsidy amount for mined blocks. This
// value is halved every SubsidyHalvingInterval blocks.
- baseSubsidy = 50 * btcutil.SatoshiPerBitcoin
+ baseSubsidy = 500 * btcutil.SatoshiPerBitcoin
)
var (
@@ -192,12 +192,42 @@ func isBIP0030Node(node *blockNode) bool {
// At the target block generation rate for the main network, this is
// approximately every 4 years.
func CalcBlockSubsidy(height int32, chainParams *chaincfg.Params) int64 {
- if chainParams.SubsidyReductionInterval == 0 {
- return baseSubsidy
+ h := int64(height)
+ if h == 0 {
+ return btcutil.SatoshiPerBitcoin * 4e8
+ }
+ if h <= 5100 {
+ return btcutil.SatoshiPerBitcoin
+ }
+ if h <= 55000 {
+ return btcutil.SatoshiPerBitcoin * (1 + (h-5001)/100)
}
- // Equivalent to: baseSubsidy / 2^(height/subsidyHalvingInterval)
- return baseSubsidy >> uint(height/chainParams.SubsidyReductionInterval)
+ lv := (h - 55001) / int64(chainParams.SubsidyReductionInterval)
+ reduction := (int64(math.Sqrt((float64(8*lv))+1)) - 1) / 2
+ for !withinLevelBounds(reduction, lv) {
+ if ((reduction*reduction + reduction) >> 1) > lv {
+ reduction--
+ } else {
+ reduction++
+ }
+ }
+ subsidyReduction := btcutil.SatoshiPerBitcoin * reduction
+ if subsidyReduction >= baseSubsidy {
+ return 0
+ }
+ return baseSubsidy - subsidyReduction
+}
+
+func withinLevelBounds(reduction int64, lv int64) bool {
+ if ((reduction*reduction + reduction) >> 1) > lv {
+ return false
+ }
+ reduction++
+ if ((reduction*reduction + reduction) >> 1) <= lv {
+ return false
+ }
+ return true
}
// CheckTransactionSanity performs some preliminary checks on a transaction to