Merge branch 'release/v4.2.x' of github.com:babylonlabs-io/babylon into release/v4.2.x

Author: RafilxTenfen

CHANGELOG.md

@@ -37,6 +37,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## Unreleased
 
+## v4.2.3
+
+### Improvements
+
+- [#1922](https://github.com/babylonlabs-io/babylon/pull/1922) chore: add const of `MaxMintedPerBlock`
+
 ## v4.2.2
 
 ### Improvements

x/mint/types/minter.go

@@ -12,6 +12,10 @@ import (
 
 const DefaultBondDenom = "ubbn"
 
+// MaxMintedPerBlock defines the maximum amount allowed to mint per block
+// On mainnet currently there is around 189 Baby tokens minted per block.
+var MaxMintedPerBlock = math.NewInt(600_000000)
+
 // NewMinter returns a new Minter object.
 func NewMinter(inflationRate math.LegacyDec, annualProvisions math.LegacyDec, bondDenom string) Minter {
 	return Minter{
@@ -67,7 +71,11 @@ func (m Minter) CalculateBlockProvision(current time.Time, previous time.Time) (
 	timeElapsed := current.Sub(previous).Nanoseconds()
 	portionOfYear := math.LegacyNewDec(timeElapsed).Quo(math.LegacyNewDec(NanosecondsPerYear))
 	blockProvision := m.AnnualProvisions.Mul(portionOfYear)
-	return sdk.NewCoin(m.BondDenom, blockProvision.TruncateInt()), nil
+
+	blockProvisionInt := blockProvision.TruncateInt()
+	amountToMint := math.MinInt(blockProvisionInt, MaxMintedPerBlock)
+
+	return sdk.NewCoin(m.BondDenom, amountToMint), nil
 }
 
 // YearsSinceGenesis returns the number of years that have passed between

x/mint/types/minter_test.go

@@ -112,6 +112,13 @@ func TestCalculateBlockProvision(t *testing.T) {
 			// 55 billion ubbn (annual provisions) * 30 (seconds) / 31,556,952 (seconds per year) = 52286.418536238861091527470713901646775011731170995  which truncates to 52.286 ubbn
 			want: sdk.NewCoin(types.DefaultBondDenom, math.NewInt(52286)),
 		},
+		{
+			name:             "capped at maximum when block provision exceeds limit",
+			annualProvisions: math.LegacyNewDec(2_000_000_000_000_000),
+			current:          current,
+			previous:         current.Add(-blockInterval),
+			want:             sdk.NewCoin(types.DefaultBondDenom, types.MaxMintedPerBlock),
+		},
 		{
 			name:             "want error when current time is before previous time",
 			annualProvisions: annualProvisions,