diff --git a/consensus/oasys/contract.go b/consensus/oasys/contract.go
index fcabba5d0..1423df2aa 100644
--- a/consensus/oasys/contract.go
+++ b/consensus/oasys/contract.go
@@ -253,7 +253,7 @@ func (c *Oasys) IsSystemTransaction(tx *types.Transaction, header *types.Header)
 	}
 
 	if sender, err := types.Sender(c.txSigner, tx); err != nil {
-		return false, errors.New("unauthorized transaction")
+		return false, fmt.Errorf("unauthorized transaction: %w", err)
 	} else if sender != header.Coinbase {
 		// not created by validator
 		return false, nil
diff --git a/consensus/oasys/oasys.go b/consensus/oasys/oasys.go
index 8d41f36ba..58a0e3c2d 100644
--- a/consensus/oasys/oasys.go
+++ b/consensus/oasys/oasys.go
@@ -217,7 +217,7 @@ func New(chainConfig *params.ChainConfig, config *params.OasysConfig, db ethdb.D
 		signatures:  signatures,
 		proposals:   make(map[common.Address]bool),
 		ethAPI:      ethAPI,
-		txSigner:    types.MakeSigner(chainConfig, common.Big0, 0),
+		txSigner:    types.LatestSigner(chainConfig),
 	}
 }
 
diff --git a/core/rawdb/chain_freezer.go b/core/rawdb/chain_freezer.go
index 16337fc0b..24b4863a6 100644
--- a/core/rawdb/chain_freezer.go
+++ b/core/rawdb/chain_freezer.go
@@ -341,13 +341,9 @@ func (f *chainFreezer) freezeRangeWithBlobs(nfdb *nofreezedb, number, limit uint
 	}
 
 	// freeze pre cancun
-	if cancunNumber == 0 {
-		// case of development
-	} else {
-		preHashes, err = f.freezeRange(nfdb, number, cancunNumber-1)
-		if err != nil {
-			return preHashes, err
-		}
+	preHashes, err = f.freezeRange(nfdb, number, cancunNumber-1)
+	if err != nil {
+		return preHashes, err
 	}
 
 	if err = ResetEmptyBlobAncientTable(f, cancunNumber); err != nil {
@@ -391,7 +387,7 @@ func (f *chainFreezer) freezeRange(nfdb *nofreezedb, number, limit uint64) (hash
 			}
 			// blobs is nil before cancun fork
 			var sidecars rlp.RawValue
-			if isCancun(env, h.Number, h.Time) && number != 0 { // except genesis block in case of development
+			if isCancun(env, h.Number, h.Time) {
 				sidecars = ReadBlobSidecarsRLP(nfdb, hash, number)
 				if len(sidecars) == 0 {
 					return fmt.Errorf("block blobs missing, can't freeze block %d", number)
@@ -414,7 +410,7 @@ func (f *chainFreezer) freezeRange(nfdb *nofreezedb, number, limit uint64) (hash
 			if err := op.AppendRaw(ChainFreezerDifficultyTable, number, td); err != nil {
 				return fmt.Errorf("can't write td to Freezer: %v", err)
 			}
-			if isCancun(env, h.Number, h.Time) && number != 0 { // except genesis block in case of development
+			if isCancun(env, h.Number, h.Time) {
 				if err := op.AppendRaw(ChainFreezerBlobSidecarTable, number, sidecars); err != nil {
 					return fmt.Errorf("can't write blobs to Freezer: %v", err)
 				}
diff --git a/eth/backend.go b/eth/backend.go
index c4ac0e0f4..14ef4c942 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -155,6 +155,17 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	if err != nil {
 		return nil, err
 	}
+	// Override the chain config with provided settings.
+	var overrides core.ChainOverrides
+	if config.OverrideCancun != nil {
+		chainConfig.CancunTime = config.OverrideCancun
+		overrides.OverrideCancun = config.OverrideCancun
+	}
+	if config.OverrideVerkle != nil {
+		chainConfig.VerkleTime = config.OverrideVerkle
+		overrides.OverrideVerkle = config.OverrideVerkle
+	}
+
 	// startup ancient freeze
 	if err = chainDb.SetupFreezerEnv(&ethdb.FreezerEnv{
 		ChainCfg:         chainConfig,
@@ -225,14 +236,6 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 			StateScheme:         scheme,
 		}
 	)
-	// Override the chain config with provided settings.
-	var overrides core.ChainOverrides
-	if config.OverrideCancun != nil {
-		overrides.OverrideCancun = config.OverrideCancun
-	}
-	if config.OverrideVerkle != nil {
-		overrides.OverrideVerkle = config.OverrideVerkle
-	}
 	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, config.Genesis, &overrides, eth.engine, vmConfig, eth.shouldPreserve, &config.TransactionHistory)
 	if err != nil {
 		return nil, err
diff --git a/params/config.go b/params/config.go
index 0e6d124fa..a3fc67d75 100644
--- a/params/config.go
+++ b/params/config.go
@@ -744,6 +744,10 @@ func (c *ChainConfig) CheckCompatible(newcfg *ChainConfig, height uint64, time u
 // CheckConfigForkOrder checks that we don't "skip" any forks, geth isn't pluggable enough
 // to guarantee that forks can be implemented in a different order than on official networks
 func (c *ChainConfig) CheckConfigForkOrder() error {
+	// skip checking for non-Oasys egine
+	if c.Oasys == nil {
+		return nil
+	}
 	type fork struct {
 		name      string
 		block     *big.Int // forks up to - and including the merge - were defined with block numbers