// CalcBlockWorkSubsidy calculates the proof of work subsidy for a block as a
// proportion of the total subsidy.
func CalcBlockWorkSubsidy(height int64, voters uint16,
params *chaincfg.Params) int64 {
subsidy := calcBlockSubsidy(height, params)
proportionWork := int64(params.WorkRewardProportion)
proportions := int64(params.TotalSubsidyProportions())
subsidy *= proportionWork
subsidy /= proportions
// Ignore the voters field of the header before we're at a point
// where there are any voters.
if height < params.StakeValidationHeight {
return subsidy
}
// If there are no voters, subsidy is 0. The block will fail later anyway.
if voters == 0 {
return 0
}
// Adjust for the number of voters. This shouldn't ever overflow if you start
// with 50 * 10^8 Atoms and voters and potentialVoters are uint16.
potentialVoters := params.TicketsPerBlock
actual := (int64(voters) * subsidy) / int64(potentialVoters)
return actual
}
// CalcBlockTaxSubsidy calculates the subsidy for the organization address in the
// coinbase.
//
// Safe for concurrent access.
func CalcBlockTaxSubsidy(height int64, voters uint16,
params *chaincfg.Params) int64 {
if params.BlockTaxProportion == 0 {
return 0
}
subsidy := calcBlockSubsidy(int64(height), params)
proportionTax := int64(params.BlockTaxProportion)
proportions := int64(params.TotalSubsidyProportions())
subsidy *= proportionTax
subsidy /= proportions
// Assume all voters 'present' before stake voting is turned on.
if height < params.StakeValidationHeight {
voters = 5
}
// If there are no voters, subsidy is 0. The block will fail later anyway.
if voters == 0 && height >= params.StakeValidationHeight {
return 0
}
// Adjust for the number of voters. This shouldn't ever overflow if you start
// with 50 * 10^8 Atoms and voters and potentialVoters are uint16.
potentialVoters := params.TicketsPerBlock
adjusted := (int64(voters) * subsidy) / int64(potentialVoters)
return adjusted
}
// CalcStakeVoteSubsidy calculates the subsidy for a stake vote based on the height
// of its input SStx.
//
// Safe for concurrent access.
func CalcStakeVoteSubsidy(height int64, params *chaincfg.Params) int64 {
// Calculate the actual reward for this block, then further reduce reward
// proportional to StakeRewardProportion.
// Note that voters/potential voters is 1, so that vote reward is calculated
// irrespective of block reward.
subsidy := calcBlockSubsidy(height, params)
proportionStake := int64(params.StakeRewardProportion)
proportions := int64(params.TotalSubsidyProportions())
subsidy *= proportionStake
subsidy /= (proportions * int64(params.TicketsPerBlock))
return subsidy
}
// CalcBlockSubsidy returns the subsidy amount a block at the provided height
// should have. This is mainly used for determining how much the coinbase for
// newly generated blocks awards as well as validating the coinbase for blocks
// has the expected value.
//
// Subsidy calculation for exponential reductions:
// 0 for i in range (0, height / ReductionInterval):
// 1 subsidy *= MulSubsidy
// 2 subsidy /= DivSubsidy
//
// Safe for concurrent access.
func calcBlockSubsidy(height int64, params *chaincfg.Params) int64 {
// Block height 1 subsidy is 'special' and used to
// distribute initial tokens, if any.
if height == 1 {
return params.BlockOneSubsidy()
}
iterations := height / params.ReductionInterval
subsidy := params.BaseSubsidy
// You could stick all these values in a LUT for faster access if you
// wanted to, but this calculation is already really fast until you
// get very very far into the blockchain. The other method you could
// use is storing the total subsidy in a block node and do the
// multiplication and division when needed when adding a block.
if iterations > 0 {
for i := int64(0); i < iterations; i++ {
subsidy *= params.MulSubsidy
subsidy /= params.DivSubsidy
}
}
return subsidy
}
