op-node/rollup: Add delta time override for oplabs sepolia devnet 0 (#9242)

op-node/rollup/superchain.go

@@ -18,14 +18,16 @@ const (
 	opMainnet = 10
 	opGoerli  = 420
 	opSepolia = 11155420
+
+	labsGoerliDevnet   = 997
+	labsGoerliChaosnet = 888
+	labsSepoliaDevnet0 = 11155421
+
 	baseGoerli  = 84531
 	baseMainnet = 8453
+
 	pgnMainnet = 424
 	pgnSepolia = 58008
-	zoraGoerli  = 999
-	zoraMainnet = 7777777
-	labsDevnet  = 997
-	chaosnet    = 888
 )
 
 // LoadOPStackRollupConfig loads the rollup configuration of the requested chain ID from the superchain-registry.
@@ -68,12 +70,20 @@ func LoadOPStackRollupConfig(chainID uint64) (*Config, error) {
 		regolithTime = 1683219600
 	case opGoerli:
 		regolithTime = 1679079600
-	case labsDevnet:
+	case labsGoerliDevnet:
 		regolithTime = 1677984480
-	case chaosnet:
+	case labsGoerliChaosnet:
 		regolithTime = 1692156862
 	}
 
+	deltaTime := superChain.Config.DeltaTime
+	// OP Labs Sepolia devnet 0 activated delta at genesis, slightly earlier than
+	// Base Sepolia devnet 0 on the same superchain.
+	switch chainID {
+	case labsSepoliaDevnet0:
+		deltaTime = new(uint64)
+	}
+
 	cfg := &Config{
 		Genesis: Genesis{
 			L1: eth.BlockID{
@@ -99,7 +109,7 @@ func LoadOPStackRollupConfig(chainID uint64) (*Config, error) {
 		L2ChainID:              new(big.Int).SetUint64(chConfig.ChainID),
 		RegolithTime:           &regolithTime,
 		CanyonTime:             superChain.Config.CanyonTime,
-		DeltaTime:              superChain.Config.DeltaTime,
+		DeltaTime:              deltaTime,
 		EcotoneTime:            superChain.Config.EcotoneTime,
 		FjordTime:              superChain.Config.FjordTime,
 		BatchInboxAddress:      common.Address(chConfig.BatchInboxAddr),
@@ -109,7 +119,7 @@ func LoadOPStackRollupConfig(chainID uint64) (*Config, error) {
 	if superChain.Config.ProtocolVersionsAddr != nil { // Set optional protocol versions address
 		cfg.ProtocolVersionsAddress = common.Address(*superChain.Config.ProtocolVersionsAddr)
 	}
-	if chainID == labsDevnet || chainID == chaosnet {
+	if chainID == labsGoerliDevnet || chainID == labsGoerliChaosnet {
 		cfg.ChannelTimeout = 120
 		cfg.MaxSequencerDrift = 1200
 	}