Added minimum threshold deltaS into CalcOrder

From simulations and rigorous testing we have understood that there is
stable operating point on just using Stoichastic or using the threshold
to determine Dom blocks in a Synchronous setting

To be able to handle the adverse network scenarios and testnet
environment and malicious miners the correct solution is mixture of
having threshold to counteract malicious miners getting lucky and
having a increased difficulty threshold to find a dom block

consensus/blake3pow/poem.go

@@ -29,15 +29,23 @@ func (blake3pow *Blake3pow) CalcOrder(header *types.Header) (*big.Int, int, erro
 	// PRIME
 	// PrimeEntropyThreshold number of zone blocks times the intrinsic logs of
 	// the given header determines the prime block
+	totalDeltaSPrime := new(big.Int).Add(header.ParentDeltaS(common.REGION_CTX), header.ParentDeltaS(common.ZONE_CTX))
+	totalDeltaSPrime = new(big.Int).Add(totalDeltaSPrime, intrinsicS)
+	primeDeltaSTarget := new(big.Int).Div(params.PrimeEntropyTarget, big2)
+	primeDeltaSTarget = new(big.Int).Mul(zoneThresholdS, primeDeltaSTarget)
+
 	primeBlockEntropyThreshold := new(big.Int).Add(zoneThresholdS, common.BitsToBigBits(params.PrimeEntropyTarget))
-	if intrinsicS.Cmp(primeBlockEntropyThreshold) > 0 {
+	if intrinsicS.Cmp(primeBlockEntropyThreshold) > 0 && totalDeltaSPrime.Cmp(primeDeltaSTarget) > 0 {
 		return intrinsicS, common.PRIME_CTX, nil
 	}
 
 	// REGION
 	// Compute the total accumulated entropy since the last region block
+	totalDeltaSRegion := new(big.Int).Add(header.ParentDeltaS(common.ZONE_CTX), intrinsicS)
+	regionDeltaSTarget := new(big.Int).Div(params.RegionEntropyTarget, big2)
+	regionDeltaSTarget = new(big.Int).Mul(zoneThresholdS, regionDeltaSTarget)
 	regionBlockEntropyThreshold := new(big.Int).Add(zoneThresholdS, common.BitsToBigBits(params.RegionEntropyTarget))
-	if intrinsicS.Cmp(regionBlockEntropyThreshold) > 0 {
+	if intrinsicS.Cmp(regionBlockEntropyThreshold) > 0 && totalDeltaSRegion.Cmp(regionDeltaSTarget) > 0 {
 		return intrinsicS, common.REGION_CTX, nil
 	}
 

consensus/progpow/poem.go

@@ -26,20 +26,30 @@ func (progpow *Progpow) CalcOrder(header *types.Header) (*big.Int, int, error) {
 	target := new(big.Int).Div(common.Big2e256, header.Difficulty())
 	zoneThresholdS := progpow.IntrinsicLogS(common.BytesToHash(target.Bytes()))
 
-	// Prime case
-	// PrimeEntropyThreshold number of zone blocks times the intrinsic logs of the given header determines the prime block
+	// PRIME
+	// PrimeEntropyThreshold number of zone blocks times the intrinsic logs of
+	// the given header determines the prime block
+	totalDeltaSPrime := new(big.Int).Add(header.ParentDeltaS(common.REGION_CTX), header.ParentDeltaS(common.ZONE_CTX))
+	totalDeltaSPrime = new(big.Int).Add(totalDeltaSPrime, intrinsicS)
+	primeDeltaSTarget := new(big.Int).Div(params.PrimeEntropyTarget, big2)
+	primeDeltaSTarget = new(big.Int).Mul(zoneThresholdS, primeDeltaSTarget)
+
 	primeBlockEntropyThreshold := new(big.Int).Add(zoneThresholdS, common.BitsToBigBits(params.PrimeEntropyTarget))
-	if intrinsicS.Cmp(primeBlockEntropyThreshold) > 0 {
+	if intrinsicS.Cmp(primeBlockEntropyThreshold) > 0 && totalDeltaSPrime.Cmp(primeDeltaSTarget) > 0 {
 		return intrinsicS, common.PRIME_CTX, nil
 	}
 
 	// REGION
 	// Compute the total accumulated entropy since the last region block
+	totalDeltaSRegion := new(big.Int).Add(header.ParentDeltaS(common.ZONE_CTX), intrinsicS)
+	regionDeltaSTarget := new(big.Int).Div(params.RegionEntropyTarget, big2)
+	regionDeltaSTarget = new(big.Int).Mul(zoneThresholdS, regionDeltaSTarget)
 	regionBlockEntropyThreshold := new(big.Int).Add(zoneThresholdS, common.BitsToBigBits(params.RegionEntropyTarget))
-	if intrinsicS.Cmp(regionBlockEntropyThreshold) > 0 {
+	if intrinsicS.Cmp(regionBlockEntropyThreshold) > 0 && totalDeltaSRegion.Cmp(regionDeltaSTarget) > 0 {
 		return intrinsicS, common.REGION_CTX, nil
 	}
 
+	// Zone case
 	return intrinsicS, common.ZONE_CTX, nil
 }