decouple negative chain selection from base fee lower bound validation

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

chain/messagepool/messagepool.go

@@ -83,7 +83,7 @@ const (
 
 // this is *temporary* mutilation until we have implemented uncapped miner penalties -- it will go
 // away in the next fork.
-var allowNegativeChains = true
+var strictBaseFeeValidation = false
 
 func init() {
 	// if the republish interval is too short compared to the pubsub timecache, adjust it
@@ -393,7 +393,7 @@ func (mp *MessagePool) verifyMsgBeforeAdd(m *types.SignedMessage, curTs *types.T
 	// Note that for local messages, we always add them so that they can be accepted and republished
 	// automatically.
 	publish := local
-	if !allowNegativeChains && len(curTs.Blocks()) > 0 {
+	if strictBaseFeeValidation && len(curTs.Blocks()) > 0 {
 		baseFee := curTs.Blocks()[0].ParentBaseFee
 		baseFeeLowerBound := types.BigDiv(baseFee, baseFeeLowerBoundFactor)
 		if m.Message.GasFeeCap.LessThan(baseFeeLowerBound) {

chain/messagepool/selection.go

@@ -18,6 +18,10 @@ import (
 
 var bigBlockGasLimit = big.NewInt(build.BlockGasLimit)
 
+// this is *temporary* mutilation until we have implemented uncapped miner penalties -- it will go
+// away in the next fork.
+var allowNegativeChains = true
+
 const MaxBlocks = 15
 
 type msgChain struct {