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3dbc42b4f7
* Replace the old blockSubsidy parameters with the new ones. * Return subsidyGenesisReward if blockHash is the genesis hash. * Traverse a block's past for the subsidy calculation. * Partially implement SubsidyStore. * Refer to SubsidyStore from CoinbaseManager. * Wrap calcBlockSubsidy in getBlockSubsidy, which first checks the database. * Fix finalityStore not calling GenerateShardingID. * Implement calculateAveragePastSubsidy. * Implement calculateMergeSetSubsidySum. * Implement calculateSubsidyRandomVariable. * Implement calcBlockSubsidy. * Add a TODO about floats. * Update the calcBlockSubsidy TODO. * Use binary.LittleEndian in calculateSubsidyRandomVariable. * Fix bad range in calculateSubsidyRandomVariable. * Replace float64 with big.Rat everywhere except for subsidyRandomVariable. * Fix a nil dereference. * Use a random walk to approximate the normal distribution. * In order to avoid unsupported fractional results from powInt64, flip the numerator and the denominator manually. * Set standardDeviation to 0.25, MaxSompi to 10_000_000_000 * SompiPerKaspa and defaultSubsidyGenesisReward to 1_000. * Set the standard deviation to 0.2. * Use a binomial distribution instead of trying to estimate the normal distribution. * Change some values around. * Clamp the block subsidy. * Remove the fake duplicate constants in the util package. * Reduce MaxSompi to only 100m Kaspa to avoid hitting the uint64 ceiling. * Lower MaxSompi further to avoid new and exciting ways for the uint64 ceiling to be hit. * Remove debug logs. * Fix a couple of failing tests. * Fix TestBlockWindow. * Fix limitTransactionCount sometimes crashing on index-out-of-bounds. * In TrustedDataDataDAABlock, replace BlockHeader with DomainBlock * In calculateAveragePastSubsidy, use blockWindow instead of doing a BFS manually. * Remove the reference to DAGTopologyManager in coinbaseManager. * Add subsidy to the coinbase payload. * Get rid of the subsidy store and extract subsidies out of coinbase transactions. * Keep a blockWindow amount of blocks under the virtual for IBD purposes. * Manually remove the virtual genesis from the merge set. * Fix simnet genesis. * Fix TestPruning. * Fix TestCheckBlockIsNotPruned. * Fix TestBlockWindow. * Fix TestCalculateSignatureHashSchnorr. * Fix TestCalculateSignatureHashECDSA. * Fix serializing the wrong value into the coinbase payload. * Rename coinbaseOutputForBlueBlock to coinbaseOutputAndSubsidyForBlueBlock. * Add a TODO about optimizing trusted data DAA window blocks. * Expand on a comment in TestCheckBlockIsNotPruned. * In calcBlockSubsidy, divide the big.Int numerator by the big.Int denominator instead of converting to float64. * Clarify a comment. * Rename SubsidyMinGenesisReward to MinSubsidy. * Properly handle trusted data blocks in calculateMergeSetSubsidySum. * Use the first two bytes of the selected parent's hash for randomness instead of math/rand. * Restore maxSompi to what it used to be. * Fix TestPruning. * Fix TestAmountCreation. * Fix TestBlockWindow. * Fix TestAmountUnitConversions. * Increase the timeout in many-tips to 30 minutes. * Check coinbase subsidy for every block * Re-rename functions * Use shift instead of powInt64 to determine subsidyRandom Co-authored-by: Ori Newman <orinewman1@gmail.com>
78 lines
4.9 KiB
Go
78 lines
4.9 KiB
Go
package dagconfig
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import (
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"github.com/kaspanet/kaspad/domain/consensus/utils/constants"
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"time"
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)
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// The documentation refers to the following constants which aren't explicated in the code:
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// d - an upper bound on the round trip time of a block
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// delta - the expected fraction of time the width of the network exceeds defaultGHOSTDAGK
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//
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// For more information about defaultGHOSTDAGK, and its dependency on delta and defaultTargetTimePerBlock
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// please refer to the PHANTOM paper: https://eprint.iacr.org/2018/104.pdf
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//
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// For more information about the DAA constants defaultDifficultyAdjustmentWindowSize, defaultTimestampDeviationTolerance,
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// and their relation to defaultGHOSTDAGK and defaultTargetTimePerBlock see:
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// https://research.kas.pa/t/handling-timestamp-manipulations/97
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//
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// For more information about defaultMergeSetSizeLimit, defaultFinalityDuration and their relation to pruning, see:
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// https://research.kas.pa/t/a-proposal-for-finality-in-ghostdag/66/17
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// https://research.kas.pa/t/some-of-the-intuition-behind-the-design-of-the-invalidation-rules-for-pruning/95
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//
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const (
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defaultMaxCoinbasePayloadLength = 150
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// defaultMaxBlockMass is a bound on the mass of a block, larger values increase the bound d
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// on the round trip time of a block, which affects the other parameters as described below
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defaultMaxBlockMass = 500_000
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// defaultMassPerTxByte, defaultMassPerScriptPubKeyByte and defaultMassPerSigOp define the number of grams per
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// transaction byte, script pub key byte and sig op respectively.
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// These values are used when calculating a transactions mass.
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defaultMassPerTxByte = 1
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defaultMassPerScriptPubKeyByte = 10
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defaultMassPerSigOp = 1000
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// defaultMaxBlockParents is the number of blocks any block can point to.
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// Should be about d/defaultTargetTimePerBlock where d is a bound on the round trip time of a block.
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defaultMaxBlockParents = 10
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// defaultGHOSTDAGK is a bound on the number of blue blocks in the anticone of a blue block. Approximates the maximal
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// width of the network.
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// Formula (1) in section 4.2 of the PHANTOM paper shows how to calculate defaultGHOSTDAGK. The delta term represents a bound
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// on the expected fraction of the network life in which the width was higher than defaultGHOSTDAGK. The current value of K
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// was calculated for d = 5 seconds and delta = 0.05.
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defaultGHOSTDAGK = 18
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// defaultMergeSetSizeLimit is a bound on the size of the past of a block and the size of the past
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// of its selected parent. Any block which violates this bound is invalid.
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// Should be at least an order of magnitude smaller than defaultFinalityDuration/defaultTargetTimePerBlock.
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// (Higher values make pruning attacks easier by a constant, lower values make merging after a split or a spike
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// in block take longer)
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defaultMergeSetSizeLimit = defaultGHOSTDAGK * 10
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defaultSubsidyGenesisReward = 1 * constants.SompiPerKaspa
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defaultMinSubsidy = 1 * constants.SompiPerKaspa
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defaultMaxSubsidy = 1000 * constants.SompiPerKaspa
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defaultCoinbasePayloadScriptPublicKeyMaxLength = 150
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// defaultDifficultyAdjustmentWindowSize is the number of blocks in a block's past used to calculate its difficulty
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// target.
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// The DAA should take the median of 2640 blocks, so in order to do that we need 2641 window size.
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defaultDifficultyAdjustmentWindowSize = 2641
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// defaultTimestampDeviationTolerance is the allowed deviance of an inconming block's timestamp, measured in block delays.
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// A new block can't hold a timestamp lower than the median timestamp of the (defaultTimestampDeviationTolerance*2-1) blocks
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// with highest accumulated blue work in its past, such blocks are considered invalid.
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// A new block can't hold a timestamp higher than the local system time + defaultTimestampDeviationTolerance/defaultTargetTimePerBlock,
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// such blocks are not marked as invalid but are rejected.
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defaultTimestampDeviationTolerance = 132
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// defaultFinalityDuration is an approximate lower bound of how old the finality block is. The finality block is chosen to
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// be the newest block in the selected chain whose blue score difference from the selected tip is at least
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// defaultFinalityDuration/defaultTargetTimePerBlock.
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// The pruning block is selected similarly, with the following duration:
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// pruning block duration =
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// 2*defaultFinalityDuration/defaultTargetTimePerBlock + 4*defaultMergeSetSizeLimit*defaultGHOSTDAGK + 2*defaultGHOSTDAGK + 2
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defaultFinalityDuration = 24 * time.Hour
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// defaultTargetTimePerBlock represents how much time should pass on average between two consecutive block creations.
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// Should be parametrized such that the average width of the DAG is about defaultMaxBlockParents and such that most of the
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// time the width of the DAG is at most defaultGHOSTDAGK.
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defaultTargetTimePerBlock = 1 * time.Second
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defaultPruningProofM = 1000
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)
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