Merge branch 'develop' into op-program-kv-store-2

op-bindings/bindings/systemconfig.go

@@ -41,7 +41,7 @@ type ResourceMeteringResourceConfig struct {
 // SystemConfigMetaData contains all meta data concerning the SystemConfig contract.
 var SystemConfigMetaData = &bind.MetaData{
 	ABI: "[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_owner\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_overhead\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_scalar\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_batcherHash\",\"type\":\"bytes32\"},{\"internalType\":\"uint64\",\"name\":\"_gasLimit\",\"type\":\"uint64\"},{\"internalType\":\"address\",\"name\":\"_unsafeBlockSigner\",\"type\":\"address\"},{\"components\":[{\"internalType\":\"uint32\",\"name\":\"maxResourceLimit\",\"type\":\"uint32\"},{\"internalType\":\"uint8\",\"name\":\"elasticityMultiplier\",\"type\":\"uint8\"},{\"internalType\":\"uint8\",\"name\":\"baseFeeMaxChangeDenominator\",\"type\":\"uint8\"},{\"internalType\":\"uint32\",\"name\":\"minimumBaseFee\",\"type\":\"uint32\"},{\"internalType\":\"uint32\",\"name\":\"systemTxMaxGas\",\"type\":\"uint32\"},{\"internalType\":\"uint128\",\"name\":\"maximumBaseFee\",\"type\":\"uint128\"}],\"internalType\":\"structResourceMetering.ResourceConfig\",\"name\":\"_config\",\"type\":\"tuple\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"version\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"enumSystemConfig.UpdateType\",\"name\":\"updateType\",\"type\":\"uint8\"},{\"indexed\":false,\"internalType\":\"bytes\",\"name\":\"data\",\"type\":\"bytes\"}],\"name\":\"ConfigUpdate\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"uint8\",\"name\":\"version\",\"type\":\"uint8\"}],\"name\":\"Initialized\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"UNSAFE_BLOCK_SIGNER_SLOT\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"VERSION\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"batcherHash\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"gasLimit\",\"outputs\":[{\"internalType\":\"uint64\",\"name\":\"\",\"type\":\"uint64\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_owner\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_overhead\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_scalar\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_batcherHash\",\"type\":\"bytes32\"},{\"internalType\":\"uint64\",\"name\":\"_gasLimit\",\"type\":\"uint64\"},{\"internalType\":\"address\",\"name\":\"_unsafeBlockSigner\",\"type\":\"address\"},{\"components\":[{\"internalType\":\"uint32\",\"name\":\"maxResourceLimit\",\"type\":\"uint32\"},{\"internalType\":\"uint8\",\"name\":\"elasticityMultiplier\",\"type\":\"uint8\"},{\"internalType\":\"uint8\",\"name\":\"baseFeeMaxChangeDenominator\",\"type\":\"uint8\"},{\"internalType\":\"uint32\",\"name\":\"minimumBaseFee\",\"type\":\"uint32\"},{\"internalType\":\"uint32\",\"name\":\"systemTxMaxGas\",\"type\":\"uint32\"},{\"internalType\":\"uint128\",\"name\":\"maximumBaseFee\",\"type\":\"uint128\"}],\"internalType\":\"structResourceMetering.ResourceConfig\",\"name\":\"_config\",\"type\":\"tuple\"}],\"name\":\"initialize\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"minimumGasLimit\",\"outputs\":[{\"internalType\":\"uint64\",\"name\":\"\",\"type\":\"uint64\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"overhead\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"renounceOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"resourceConfig\",\"outputs\":[{\"components\":[{\"internalType\":\"uint32\",\"name\":\"maxResourceLimit\",\"type\":\"uint32\"},{\"internalType\":\"uint8\",\"name\":\"elasticityMultiplier\",\"type\":\"uint8\"},{\"internalType\":\"uint8\",\"name\":\"baseFeeMaxChangeDenominator\",\"type\":\"uint8\"},{\"internalType\":\"uint32\",\"name\":\"minimumBaseFee\",\"type\":\"uint32\"},{\"internalType\":\"uint32\",\"name\":\"systemTxMaxGas\",\"type\":\"uint32\"},{\"internalType\":\"uint128\",\"name\":\"maximumBaseFee\",\"type\":\"uint128\"}],\"internalType\":\"structResourceMetering.ResourceConfig\",\"name\":\"\",\"type\":\"tuple\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"scalar\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_batcherHash\",\"type\":\"bytes32\"}],\"name\":\"setBatcherHash\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_overhead\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_scalar\",\"type\":\"uint256\"}],\"name\":\"setGasConfig\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint64\",\"name\":\"_gasLimit\",\"type\":\"uint64\"}],\"name\":\"setGasLimit\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"components\":[{\"internalType\":\"uint32\",\"name\":\"maxResourceLimit\",\"type\":\"uint32\"},{\"internalType\":\"uint8\",\"name\":\"elasticityMultiplier\",\"type\":\"uint8\"},{\"internalType\":\"uint8\",\"name\":\"baseFeeMaxChangeDenominator\",\"type\":\"uint8\"},{\"internalType\":\"uint32\",\"name\":\"minimumBaseFee\",\"type\":\"uint32\"},{\"internalType\":\"uint32\",\"name\":\"systemTxMaxGas\",\"type\":\"uint32\"},{\"internalType\":\"uint128\",\"name\":\"maximumBaseFee\",\"type\":\"uint128\"}],\"internalType\":\"structResourceMetering.ResourceConfig\",\"name\":\"_config\",\"type\":\"tuple\"}],\"name\":\"setResourceConfig\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_unsafeBlockSigner\",\"type\":\"address\"}],\"name\":\"setUnsafeBlockSigner\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"unsafeBlockSigner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"version\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"}]",
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 }
 
 // SystemConfigABI is the input ABI used to generate the binding from.

op-bindings/bindings/systemconfig_more.go

@@ -13,7 +13,7 @@ const SystemConfigStorageLayoutJSON = "{\"storage\":[{\"astId\":1000,\"contract\
 
 var SystemConfigStorageLayout = new(solc.StorageLayout)
 
-var SystemConfigDeployedBin = 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+var SystemConfigDeployedBin = "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"
 
 func init() {
 	if err := json.Unmarshal([]byte(SystemConfigStorageLayoutJSON), SystemConfigStorageLayout); err != nil {

op-e2e/actions/blocktime_test.go

@@ -28,12 +28,11 @@ func TestBatchInLastPossibleBlocks(gt *testing.T) {
 
 	signer := types.LatestSigner(sd.L2Cfg.Config)
 	cl := sequencerEngine.EthClient()
+	aliceNonce := uint64(0) // manual nonce management to avoid geth pending-tx nonce non-determinism flakiness
 	aliceTx := func() {
-		n, err := cl.PendingNonceAt(t.Ctx(), dp.Addresses.Alice)
-		require.NoError(t, err)
 		tx := types.MustSignNewTx(dp.Secrets.Alice, signer, &types.DynamicFeeTx{
 			ChainID:   sd.L2Cfg.Config.ChainID,
-			Nonce:     n,
+			Nonce:     aliceNonce,
 			GasTipCap: big.NewInt(2 * params.GWei),
 			GasFeeCap: new(big.Int).Add(miner.l1Chain.CurrentBlock().BaseFee, big.NewInt(2*params.GWei)),
 			Gas:       params.TxGas,
@@ -41,6 +40,7 @@ func TestBatchInLastPossibleBlocks(gt *testing.T) {
 			Value:     e2eutils.Ether(2),
 		})
 		require.NoError(gt, cl.SendTransaction(t.Ctx(), tx))
+		aliceNonce += 1
 	}
 	makeL2BlockWithAliceTx := func() {
 		aliceTx()

op-node/node/api.go

@@ -9,7 +9,6 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/log"
 
-	"github.com/ethereum-optimism/optimism/op-bindings/bindings"
 	"github.com/ethereum-optimism/optimism/op-bindings/predeploys"
 	"github.com/ethereum-optimism/optimism/op-node/eth"
 	"github.com/ethereum-optimism/optimism/op-node/rollup"
@@ -115,12 +114,7 @@ func (n *nodeAPI) OutputAtBlock(ctx context.Context, number hexutil.Uint64) (*et
 	}
 
 	var l2OutputRootVersion eth.Bytes32 // it's zero for now
-	l2OutputRoot, err := rollup.ComputeL2OutputRoot(&bindings.TypesOutputRootProof{
-		Version:                  l2OutputRootVersion,
-		StateRoot:                head.Root(),
-		MessagePasserStorageRoot: proof.StorageHash,
-		LatestBlockhash:          head.Hash(),
-	})
+	l2OutputRoot, err := rollup.ComputeL2OutputRootV0(head, proof.StorageHash)
 	if err != nil {
 		n.log.Error("Error computing L2 output root, nil ptr passed to hashing function")
 		return nil, err

op-node/rollup/output_root.go

@@ -24,3 +24,13 @@ func ComputeL2OutputRoot(proofElements *bindings.TypesOutputRootProof) (eth.Byte
 	)
 	return eth.Bytes32(digest), nil
 }
+
+func ComputeL2OutputRootV0(block eth.BlockInfo, storageRoot [32]byte) (eth.Bytes32, error) {
+	var l2OutputRootVersion eth.Bytes32 // it's zero for now
+	return ComputeL2OutputRoot(&bindings.TypesOutputRootProof{
+		Version:                  l2OutputRootVersion,
+		StateRoot:                block.Root(),
+		MessagePasserStorageRoot: storageRoot,
+		LatestBlockhash:          block.Hash(),
+	})
+}

op-node/sources/batching.go

@@ -24,6 +24,7 @@ type IterativeBatchCall[K any, V any] struct {
 
 	makeRequest func(K) (V, rpc.BatchElem)
 	getBatch    BatchCallContextFn
+	getSingle   CallContextFn
 
 	requestsValues []V
 	scheduled      chan rpc.BatchElem
@@ -35,6 +36,7 @@ func NewIterativeBatchCall[K any, V any](
 	requestsKeys []K,
 	makeRequest func(K) (V, rpc.BatchElem),
 	getBatch BatchCallContextFn,
+	getSingle CallContextFn,
 	batchSize int) *IterativeBatchCall[K, V] {
 
 	if len(requestsKeys) < batchSize {
@@ -47,6 +49,7 @@ func NewIterativeBatchCall[K any, V any](
 	out := &IterativeBatchCall[K, V]{
 		completed:    0,
 		getBatch:     getBatch,
+		getSingle:    getSingle,
 		requestsKeys: requestsKeys,
 		batchSize:    batchSize,
 		makeRequest:  makeRequest,
@@ -84,6 +87,11 @@ func (ibc *IterativeBatchCall[K, V]) Fetch(ctx context.Context) error {
 	ibc.resetLock.RLock()
 	defer ibc.resetLock.RUnlock()
 
+	// return early if context is Done
+	if ctx.Err() != nil {
+		return ctx.Err()
+	}
+
 	// collect a batch from the requests channel
 	batch := make([]rpc.BatchElem, 0, ibc.batchSize)
 	// wait for first element
@@ -119,11 +127,23 @@ func (ibc *IterativeBatchCall[K, V]) Fetch(ctx context.Context) error {
 		break
 	}
 
-	if err := ibc.getBatch(ctx, batch); err != nil {
-		for _, r := range batch {
-			ibc.scheduled <- r
+	if len(batch) == 0 {
+		return nil
+	}
+
+	if ibc.batchSize == 1 {
+		first := batch[0]
+		if err := ibc.getSingle(ctx, &first.Result, first.Method, first.Args...); err != nil {
+			ibc.scheduled <- first
+			return err
+		}
+	} else {
+		if err := ibc.getBatch(ctx, batch); err != nil {
+			for _, r := range batch {
+				ibc.scheduled <- r
+			}
+			return fmt.Errorf("failed batch-retrieval: %w", err)
 		}
-		return fmt.Errorf("failed batch-retrieval: %w", err)
 	}
 	var result error
 	for _, elem := range batch {

op-node/sources/batching_test.go

@@ -34,7 +34,8 @@ type batchTestCase struct {
 
 	batchSize int
 
-	batchCalls []batchCall
+	batchCalls  []batchCall
+	singleCalls []elemCall
 
 	mock.Mock
 }
@@ -53,7 +54,14 @@ func (tc *batchTestCase) GetBatch(ctx context.Context, b []rpc.BatchElem) error
 	if ctx.Err() != nil {
 		return ctx.Err()
 	}
-	return tc.Mock.MethodCalled("get", b).Get(0).([]error)[0]
+	return tc.Mock.MethodCalled("getBatch", b).Get(0).([]error)[0]
+}
+
+func (tc *batchTestCase) GetSingle(ctx context.Context, result any, method string, args ...any) error {
+	if ctx.Err() != nil {
+		return ctx.Err()
+	}
+	return tc.Mock.MethodCalled("getSingle", (*(result.(*interface{}))).(*string), method, args[0]).Get(0).([]error)[0]
 }
 
 var mockErr = errors.New("mockErr")
@@ -64,7 +72,7 @@ func (tc *batchTestCase) Run(t *testing.T) {
 		keys[i] = i
 	}
 
-	makeMock := func(bci int, bc batchCall) func(args mock.Arguments) {
+	makeBatchMock := func(bc batchCall) func(args mock.Arguments) {
 		return func(args mock.Arguments) {
 			batch := args[0].([]rpc.BatchElem)
 			for i, elem := range batch {
@@ -83,7 +91,7 @@ func (tc *batchTestCase) Run(t *testing.T) {
 		}
 	}
 	// mock all the results of the batch calls
-	for bci, bc := range tc.batchCalls {
+	for _, bc := range tc.batchCalls {
 		var batch []rpc.BatchElem
 		for _, elem := range bc.elems {
 			batch = append(batch, rpc.BatchElem{
@@ -94,10 +102,30 @@ func (tc *batchTestCase) Run(t *testing.T) {
 			})
 		}
 		if len(bc.elems) > 0 {
-			tc.On("get", batch).Once().Run(makeMock(bci, bc)).Return([]error{bc.rpcErr}) // wrap to preserve nil as type of error
+			tc.On("getBatch", batch).Once().Run(makeBatchMock(bc)).Return([]error{bc.rpcErr}) // wrap to preserve nil as type of error
+		}
+	}
+	makeSingleMock := func(ec elemCall) func(args mock.Arguments) {
+		return func(args mock.Arguments) {
+			result := args[0].(*string)
+			id := args[2].(int)
+			require.Equal(t, ec.id, id, "element should match expected element")
+			if ec.err {
+				*result = ""
+			} else {
+				*result = fmt.Sprintf("mock result id %d", id)
+			}
 		}
 	}
-	iter := NewIterativeBatchCall[int, *string](keys, makeTestRequest, tc.GetBatch, tc.batchSize)
+	// mock the results of unbatched calls
+	for _, ec := range tc.singleCalls {
+		var ret error
+		if ec.err {
+			ret = mockErr
+		}
+		tc.On("getSingle", new(string), "testing_foobar", ec.id).Once().Run(makeSingleMock(ec)).Return([]error{ret})
+	}
+	iter := NewIterativeBatchCall[int, *string](keys, makeTestRequest, tc.GetBatch, tc.GetSingle, tc.batchSize)
 	for i, bc := range tc.batchCalls {
 		ctx := context.Background()
 		if bc.makeCtx != nil {
@@ -116,6 +144,20 @@ func (tc *batchTestCase) Run(t *testing.T) {
 			}
 		}
 	}
+	for i, ec := range tc.singleCalls {
+		ctx := context.Background()
+		err := iter.Fetch(ctx)
+		if err == io.EOF {
+			require.Equal(t, i, len(tc.singleCalls)-1, "EOF only on last call")
+		} else {
+			require.False(t, iter.Complete())
+			if ec.err {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		}
+	}
 	require.True(t, iter.Complete(), "batch iter should be complete after the expected calls")
 	out, err := iter.Result()
 	require.NoError(t, err)
@@ -154,6 +196,37 @@ func TestFetchBatched(t *testing.T) {
 				},
 			},
 		},
+		{
+			name:      "single element",
+			items:     1,
+			batchSize: 4,
+			singleCalls: []elemCall{
+				{id: 0, err: false},
+			},
+		},
+		{
+			name:      "unbatched",
+			items:     4,
+			batchSize: 1,
+			singleCalls: []elemCall{
+				{id: 0, err: false},
+				{id: 1, err: false},
+				{id: 2, err: false},
+				{id: 3, err: false},
+			},
+		},
+		{
+			name:      "unbatched with retry",
+			items:     4,
+			batchSize: 1,
+			singleCalls: []elemCall{
+				{id: 0, err: false},
+				{id: 1, err: true},
+				{id: 2, err: false},
+				{id: 3, err: false},
+				{id: 1, err: false},
+			},
+		},
 		{
 			name:      "split",
 			items:     5,
@@ -240,7 +313,7 @@ func TestFetchBatched(t *testing.T) {
 		},
 		{
 			name:      "context timeout",
-			items:     1,
+			items:     2,
 			batchSize: 3,
 			batchCalls: []batchCall{
 				{
@@ -255,6 +328,7 @@ func TestFetchBatched(t *testing.T) {
 				{
 					elems: []elemCall{
 						{id: 0, err: false},
+						{id: 1, err: false},
 					},
 					err: "",
 				},

op-node/sources/receipts.go

@@ -373,6 +373,7 @@ func (job *receiptsFetchingJob) runFetcher(ctx context.Context) error {
 			job.txHashes,
 			makeReceiptRequest,
 			job.client.BatchCallContext,
+			job.client.CallContext,
 			job.maxBatchSize,
 		)
 	}

op-program/client/driver/driver.go

@@ -18,17 +18,24 @@ type Derivation interface {
 	SafeL2Head() eth.L2BlockRef
 }
 
+type L2Source interface {
+	derive.Engine
+	L2OutputRoot() (eth.Bytes32, error)
+}
+
 type Driver struct {
-	logger   log.Logger
-	pipeline Derivation
+	logger       log.Logger
+	pipeline     Derivation
+	l2OutputRoot func() (eth.Bytes32, error)
 }
 
-func NewDriver(logger log.Logger, cfg *rollup.Config, l1Source derive.L1Fetcher, l2Source derive.Engine) *Driver {
+func NewDriver(logger log.Logger, cfg *rollup.Config, l1Source derive.L1Fetcher, l2Source L2Source) *Driver {
 	pipeline := derive.NewDerivationPipeline(logger, cfg, l1Source, l2Source, metrics.NoopMetrics)
 	pipeline.Reset()
 	return &Driver{
-		logger:   logger,
-		pipeline: pipeline,
+		logger:       logger,
+		pipeline:     pipeline,
+		l2OutputRoot: l2Source.L2OutputRoot,
 	}
 }
 
@@ -51,3 +58,13 @@ func (d *Driver) Step(ctx context.Context) error {
 func (d *Driver) SafeHead() eth.L2BlockRef {
 	return d.pipeline.SafeL2Head()
 }
+
+func (d *Driver) ValidateClaim(claimedOutputRoot eth.Bytes32) bool {
+	outputRoot, err := d.l2OutputRoot()
+	if err != nil {
+		d.logger.Info("Failed to calculate L2 output root", "err", err)
+		return false
+	}
+	d.logger.Info("Derivation complete", "head", d.SafeHead(), "output", outputRoot, "claim", claimedOutputRoot)
+	return claimedOutputRoot == outputRoot
+}

op-program/client/driver/driver_test.go

@@ -45,6 +45,36 @@ func TestNoError(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestValidateClaim(t *testing.T) {
+	t.Run("Valid", func(t *testing.T) {
+		driver := createDriver(t, io.EOF)
+		expected := eth.Bytes32{0x11}
+		driver.l2OutputRoot = func() (eth.Bytes32, error) {
+			return expected, nil
+		}
+		valid := driver.ValidateClaim(expected)
+		require.True(t, valid)
+	})
+
+	t.Run("Invalid", func(t *testing.T) {
+		driver := createDriver(t, io.EOF)
+		driver.l2OutputRoot = func() (eth.Bytes32, error) {
+			return eth.Bytes32{0x22}, nil
+		}
+		valid := driver.ValidateClaim(eth.Bytes32{0x11})
+		require.False(t, valid)
+	})
+
+	t.Run("Error", func(t *testing.T) {
+		driver := createDriver(t, io.EOF)
+		driver.l2OutputRoot = func() (eth.Bytes32, error) {
+			return eth.Bytes32{}, errors.New("boom")
+		}
+		valid := driver.ValidateClaim(eth.Bytes32{0x11})
+		require.False(t, valid)
+	})
+}
+
 func createDriver(t *testing.T, derivationResult error) *Driver {
 	derivation := &stubDerivation{nextErr: derivationResult}
 	return &Driver{

op-program/client/l1/cache.go

+package l1
+
+import (
+	"github.com/ethereum-optimism/optimism/op-node/eth"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/hashicorp/golang-lru/v2/simplelru"
+)
+
+// Cache size is quite high as retrieving data from the pre-image oracle can be quite expensive
+const cacheSize = 2000
+
+// CachingOracle is an implementation of Oracle that delegates to another implementation, adding caching of all results
+type CachingOracle struct {
+	oracle Oracle
+	blocks *simplelru.LRU[common.Hash, eth.BlockInfo]
+	txs    *simplelru.LRU[common.Hash, types.Transactions]
+	rcpts  *simplelru.LRU[common.Hash, types.Receipts]
+}
+
+func NewCachingOracle(oracle Oracle) *CachingOracle {
+	blockLRU, _ := simplelru.NewLRU[common.Hash, eth.BlockInfo](cacheSize, nil)
+	txsLRU, _ := simplelru.NewLRU[common.Hash, types.Transactions](cacheSize, nil)
+	rcptsLRU, _ := simplelru.NewLRU[common.Hash, types.Receipts](cacheSize, nil)
+	return &CachingOracle{
+		oracle: oracle,
+		blocks: blockLRU,
+		txs:    txsLRU,
+		rcpts:  rcptsLRU,
+	}
+}
+
+func (o *CachingOracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo {
+	block, ok := o.blocks.Get(blockHash)
+	if ok {
+		return block
+	}
+	block = o.oracle.HeaderByBlockHash(blockHash)
+	o.blocks.Add(blockHash, block)
+	return block
+}
+
+func (o *CachingOracle) TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions) {
+	txs, ok := o.txs.Get(blockHash)
+	if ok {
+		return o.HeaderByBlockHash(blockHash), txs
+	}
+	block, txs := o.oracle.TransactionsByBlockHash(blockHash)
+	o.blocks.Add(blockHash, block)
+	o.txs.Add(blockHash, txs)
+	return block, txs
+}
+
+func (o *CachingOracle) ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts) {
+	rcpts, ok := o.rcpts.Get(blockHash)
+	if ok {
+		return o.HeaderByBlockHash(blockHash), rcpts
+	}
+	block, rcpts := o.oracle.ReceiptsByBlockHash(blockHash)
+	o.blocks.Add(blockHash, block)
+	o.rcpts.Add(blockHash, rcpts)
+	return block, rcpts
+}

op-program/client/l1/cache_test.go

+package l1
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-node/testutils"
+	"github.com/stretchr/testify/require"
+)
+
+// Should implement Oracle
+var _ Oracle = (*CachingOracle)(nil)
+
+func TestCachingOracle_HeaderByBlockHash(t *testing.T) {
+	rng := rand.New(rand.NewSource(1))
+	stub := newStubOracle(t)
+	oracle := NewCachingOracle(stub)
+	block := testutils.RandomBlockInfo(rng)
+
+	// Initial call retrieves from the stub
+	stub.blocks[block.Hash()] = block
+	result := oracle.HeaderByBlockHash(block.Hash())
+	require.Equal(t, block, result)
+
+	// Later calls should retrieve from cache
+	delete(stub.blocks, block.Hash())
+	result = oracle.HeaderByBlockHash(block.Hash())
+	require.Equal(t, block, result)
+}
+
+func TestCachingOracle_TransactionsByBlockHash(t *testing.T) {
+	rng := rand.New(rand.NewSource(1))
+	stub := newStubOracle(t)
+	oracle := NewCachingOracle(stub)
+	block, _ := testutils.RandomBlock(rng, 3)
+
+	// Initial call retrieves from the stub
+	stub.blocks[block.Hash()] = block
+	stub.txs[block.Hash()] = block.Transactions()
+	actualBlock, actualTxs := oracle.TransactionsByBlockHash(block.Hash())
+	require.Equal(t, block, actualBlock)
+	require.Equal(t, block.Transactions(), actualTxs)
+
+	// Later calls should retrieve from cache
+	delete(stub.blocks, block.Hash())
+	delete(stub.txs, block.Hash())
+	actualBlock, actualTxs = oracle.TransactionsByBlockHash(block.Hash())
+	require.Equal(t, block, actualBlock)
+	require.Equal(t, block.Transactions(), actualTxs)
+}
+
+func TestCachingOracle_ReceiptsByBlockHash(t *testing.T) {
+	rng := rand.New(rand.NewSource(1))
+	stub := newStubOracle(t)
+	oracle := NewCachingOracle(stub)
+	block, rcpts := testutils.RandomBlock(rng, 3)
+
+	// Initial call retrieves from the stub
+	stub.blocks[block.Hash()] = block
+	stub.rcpts[block.Hash()] = rcpts
+	actualBlock, actualRcpts := oracle.ReceiptsByBlockHash(block.Hash())
+	require.Equal(t, block, actualBlock)
+	require.EqualValues(t, rcpts, actualRcpts)
+
+	// Later calls should retrieve from cache
+	delete(stub.blocks, block.Hash())
+	delete(stub.rcpts, block.Hash())
+	actualBlock, actualRcpts = oracle.ReceiptsByBlockHash(block.Hash())
+	require.Equal(t, block, actualBlock)
+	require.EqualValues(t, rcpts, actualRcpts)
+}

op-program/client/l1/client.go

@@ -31,7 +31,7 @@ func NewOracleL1Client(logger log.Logger, oracle Oracle, l1Head common.Hash) *Or
 	}
 }
 
-func (o OracleL1Client) L1BlockRefByLabel(ctx context.Context, label eth.BlockLabel) (eth.L1BlockRef, error) {
+func (o *OracleL1Client) L1BlockRefByLabel(ctx context.Context, label eth.BlockLabel) (eth.L1BlockRef, error) {
 	if label != eth.Unsafe && label != eth.Safe && label != eth.Finalized {
 		return eth.L1BlockRef{}, fmt.Errorf("%w: %s", ErrUnknownLabel, label)
 	}
@@ -39,7 +39,7 @@ func (o OracleL1Client) L1BlockRefByLabel(ctx context.Context, label eth.BlockLa
 	return o.head, nil
 }
 
-func (o OracleL1Client) L1BlockRefByNumber(ctx context.Context, number uint64) (eth.L1BlockRef, error) {
+func (o *OracleL1Client) L1BlockRefByNumber(ctx context.Context, number uint64) (eth.L1BlockRef, error) {
 	if number > o.head.Number {
 		return eth.L1BlockRef{}, fmt.Errorf("%w: block number %d", ErrNotFound, number)
 	}
@@ -50,20 +50,20 @@ func (o OracleL1Client) L1BlockRefByNumber(ctx context.Context, number uint64) (
 	return block, nil
 }
 
-func (o OracleL1Client) L1BlockRefByHash(ctx context.Context, hash common.Hash) (eth.L1BlockRef, error) {
+func (o *OracleL1Client) L1BlockRefByHash(ctx context.Context, hash common.Hash) (eth.L1BlockRef, error) {
 	return eth.InfoToL1BlockRef(o.oracle.HeaderByBlockHash(hash)), nil
 }
 
-func (o OracleL1Client) InfoByHash(ctx context.Context, hash common.Hash) (eth.BlockInfo, error) {
+func (o *OracleL1Client) InfoByHash(ctx context.Context, hash common.Hash) (eth.BlockInfo, error) {
 	return o.oracle.HeaderByBlockHash(hash), nil
 }
 
-func (o OracleL1Client) FetchReceipts(ctx context.Context, blockHash common.Hash) (eth.BlockInfo, types.Receipts, error) {
+func (o *OracleL1Client) FetchReceipts(ctx context.Context, blockHash common.Hash) (eth.BlockInfo, types.Receipts, error) {
 	info, rcpts := o.oracle.ReceiptsByBlockHash(blockHash)
 	return info, rcpts, nil
 }
 
-func (o OracleL1Client) InfoAndTxsByHash(ctx context.Context, hash common.Hash) (eth.BlockInfo, types.Transactions, error) {
+func (o *OracleL1Client) InfoAndTxsByHash(ctx context.Context, hash common.Hash) (eth.BlockInfo, types.Transactions, error) {
 	info, txs := o.oracle.TransactionsByBlockHash(hash)
 	return info, txs, nil
 }

op-program/client/l1/client_test.go

@@ -145,54 +145,12 @@ func TestL1BlockRefByNumber(t *testing.T) {
 }
 
 func newClient(t *testing.T) (*OracleL1Client, *stubOracle) {
-	stub := &stubOracle{
-		t:      t,
-		blocks: make(map[common.Hash]eth.BlockInfo),
-		txs:    make(map[common.Hash]types.Transactions),
-		rcpts:  make(map[common.Hash]types.Receipts),
-	}
+	stub := newStubOracle(t)
 	stub.blocks[head.Hash()] = head
 	client := NewOracleL1Client(testlog.Logger(t, log.LvlDebug), stub, head.Hash())
 	return client, stub
 }
 
-type stubOracle struct {
-	t *testing.T
-
-	// blocks maps block hash to eth.BlockInfo
-	blocks map[common.Hash]eth.BlockInfo
-
-	// txs maps block hash to transactions
-	txs map[common.Hash]types.Transactions
-
-	// rcpts maps Block hash to receipts
-	rcpts map[common.Hash]types.Receipts
-}
-
-func (o stubOracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo {
-	info, ok := o.blocks[blockHash]
-	if !ok {
-		o.t.Fatalf("unknown block %s", blockHash)
-	}
-	return info
-}
-
-func (o stubOracle) TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions) {
-	txs, ok := o.txs[blockHash]
-	if !ok {
-		o.t.Fatalf("unknown txs %s", blockHash)
-	}
-	return o.HeaderByBlockHash(blockHash), txs
-}
-
-func (o stubOracle) ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts) {
-	rcpts, ok := o.rcpts[blockHash]
-	if !ok {
-		o.t.Fatalf("unknown rcpts %s", blockHash)
-	}
-	return o.HeaderByBlockHash(blockHash), rcpts
-}
-
 func blockNum(num uint64) eth.BlockInfo {
 	parentNum := num - 1
 	return &testutils.MockBlockInfo{

op-program/client/l1/stub_oracle_test.go

+package l1
+
+import (
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-node/eth"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+type stubOracle struct {
+	t *testing.T
+
+	// blocks maps block hash to eth.BlockInfo
+	blocks map[common.Hash]eth.BlockInfo
+
+	// txs maps block hash to transactions
+	txs map[common.Hash]types.Transactions
+
+	// rcpts maps Block hash to receipts
+	rcpts map[common.Hash]types.Receipts
+}
+
+func newStubOracle(t *testing.T) *stubOracle {
+	return &stubOracle{
+		t:      t,
+		blocks: make(map[common.Hash]eth.BlockInfo),
+		txs:    make(map[common.Hash]types.Transactions),
+		rcpts:  make(map[common.Hash]types.Receipts),
+	}
+}
+func (o stubOracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo {
+	info, ok := o.blocks[blockHash]
+	if !ok {
+		o.t.Fatalf("unknown block %s", blockHash)
+	}
+	return info
+}
+
+func (o stubOracle) TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions) {
+	txs, ok := o.txs[blockHash]
+	if !ok {
+		o.t.Fatalf("unknown txs %s", blockHash)
+	}
+	return o.HeaderByBlockHash(blockHash), txs
+}
+
+func (o stubOracle) ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts) {
+	rcpts, ok := o.rcpts[blockHash]
+	if !ok {
+		o.t.Fatalf("unknown rcpts %s", blockHash)
+	}
+	return o.HeaderByBlockHash(blockHash), rcpts
+}

op-program/client/l2/cache.go

+package l2
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/hashicorp/golang-lru/v2/simplelru"
+)
+
+const blockCacheSize = 2_000
+const nodeCacheSize = 100_000
+const codeCacheSize = 10_000
+
+type CachingOracle struct {
+	oracle Oracle
+	blocks *simplelru.LRU[common.Hash, *types.Block]
+	nodes  *simplelru.LRU[common.Hash, []byte]
+	codes  *simplelru.LRU[common.Hash, []byte]
+}
+
+func NewCachingOracle(oracle Oracle) *CachingOracle {
+	blockLRU, _ := simplelru.NewLRU[common.Hash, *types.Block](blockCacheSize, nil)
+	nodeLRU, _ := simplelru.NewLRU[common.Hash, []byte](nodeCacheSize, nil)
+	codeLRU, _ := simplelru.NewLRU[common.Hash, []byte](codeCacheSize, nil)
+	return &CachingOracle{
+		oracle: oracle,
+		blocks: blockLRU,
+		nodes:  nodeLRU,
+		codes:  codeLRU,
+	}
+}
+
+func (o *CachingOracle) NodeByHash(nodeHash common.Hash) []byte {
+	node, ok := o.nodes.Get(nodeHash)
+	if ok {
+		return node
+	}
+	node = o.oracle.NodeByHash(nodeHash)
+	o.nodes.Add(nodeHash, node)
+	return node
+}
+
+func (o *CachingOracle) CodeByHash(codeHash common.Hash) []byte {
+	code, ok := o.codes.Get(codeHash)
+	if ok {
+		return code
+	}
+	code = o.oracle.CodeByHash(codeHash)
+	o.codes.Add(codeHash, code)
+	return code
+}
+
+func (o *CachingOracle) BlockByHash(blockHash common.Hash) *types.Block {
+	block, ok := o.blocks.Get(blockHash)
+	if ok {
+		return block
+	}
+	block = o.oracle.BlockByHash(blockHash)
+	o.blocks.Add(blockHash, block)
+	return block
+}

op-program/client/l2/cache_test.go

+package l2
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-node/testutils"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/stretchr/testify/require"
+)
+
+// Should be an Oracle implementation
+var _ Oracle = (*CachingOracle)(nil)
+
+func TestBlockByHash(t *testing.T) {
+	stub, _ := newStubOracle(t)
+	oracle := NewCachingOracle(stub)
+
+	rng := rand.New(rand.NewSource(1))
+	block, _ := testutils.RandomBlock(rng, 1)
+
+	// Initial call retrieves from the stub
+	stub.blocks[block.Hash()] = block
+	actual := oracle.BlockByHash(block.Hash())
+	require.Equal(t, block, actual)
+
+	// Later calls should retrieve from cache
+	delete(stub.blocks, block.Hash())
+	actual = oracle.BlockByHash(block.Hash())
+	require.Equal(t, block, actual)
+}
+
+func TestNodeByHash(t *testing.T) {
+	stub, stateStub := newStubOracle(t)
+	oracle := NewCachingOracle(stub)
+
+	node := []byte{12, 3, 4}
+	hash := common.Hash{0xaa}
+
+	// Initial call retrieves from the stub
+	stateStub.data[hash] = node
+	actual := oracle.NodeByHash(hash)
+	require.Equal(t, node, actual)
+
+	// Later calls should retrieve from cache
+	delete(stateStub.data, hash)
+	actual = oracle.NodeByHash(hash)
+	require.Equal(t, node, actual)
+}
+
+func TestCodeByHash(t *testing.T) {
+	stub, stateStub := newStubOracle(t)
+	oracle := NewCachingOracle(stub)
+
+	node := []byte{12, 3, 4}
+	hash := common.Hash{0xaa}
+
+	// Initial call retrieves from the stub
+	stateStub.code[hash] = node
+	actual := oracle.CodeByHash(hash)
+	require.Equal(t, node, actual)
+
+	// Later calls should retrieve from cache
+	delete(stateStub.code, hash)
+	actual = oracle.CodeByHash(hash)
+	require.Equal(t, node, actual)
+}

op-program/client/l2/db_test.go

@@ -194,51 +194,3 @@ func assertStateDataAvailable(t *testing.T, db ethdb.KeyValueStore, l2Genesis *c
 	require.Nil(t, statedb.GetCode(unknownAccount), "unset account code")
 	require.Equal(t, common.Hash{}, statedb.GetCodeHash(unknownAccount), "unset account code hash")
 }
-
-func newStubStateOracle(t *testing.T) *stubStateOracle {
-	return &stubStateOracle{
-		t:    t,
-		data: make(map[common.Hash][]byte),
-		code: make(map[common.Hash][]byte),
-	}
-}
-
-type stubStateOracle struct {
-	t    *testing.T
-	data map[common.Hash][]byte
-	code map[common.Hash][]byte
-}
-
-func (o *stubStateOracle) NodeByHash(nodeHash common.Hash) []byte {
-	data, ok := o.data[nodeHash]
-	if !ok {
-		o.t.Fatalf("no value for node %v", nodeHash)
-	}
-	return data
-}
-
-func (o *stubStateOracle) CodeByHash(hash common.Hash) []byte {
-	data, ok := o.code[hash]
-	if !ok {
-		o.t.Fatalf("no value for code %v", hash)
-	}
-	return data
-}
-
-// kvStateOracle loads data from a source ethdb.KeyValueStore
-type kvStateOracle struct {
-	t      *testing.T
-	source ethdb.KeyValueStore
-}
-
-func (o *kvStateOracle) NodeByHash(nodeHash common.Hash) []byte {
-	val, err := o.source.Get(nodeHash.Bytes())
-	if err != nil {
-		o.t.Fatalf("error retrieving node %v: %v", nodeHash, err)
-	}
-	return val
-}
-
-func (o *kvStateOracle) CodeByHash(hash common.Hash) []byte {
-	return rawdb.ReadCode(o.source, hash)
-}

op-program/client/l2/engine.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/ethereum-optimism/optimism/op-bindings/predeploys"
 	"github.com/ethereum-optimism/optimism/op-node/eth"
 	"github.com/ethereum-optimism/optimism/op-node/rollup"
 	"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
@@ -33,19 +34,32 @@ func NewOracleEngine(rollupCfg *rollup.Config, logger log.Logger, backend engine
 	}
 }
 
-func (o OracleEngine) GetPayload(ctx context.Context, payloadId eth.PayloadID) (*eth.ExecutionPayload, error) {
+func (o *OracleEngine) L2OutputRoot() (eth.Bytes32, error) {
+	outBlock := o.backend.CurrentHeader()
+	stateDB, err := o.backend.StateAt(outBlock.Root)
+	if err != nil {
+		return eth.Bytes32{}, fmt.Errorf("failed to open L2 state db at block %s: %w", outBlock.Hash(), err)
+	}
+	withdrawalsTrie, err := stateDB.StorageTrie(predeploys.L2ToL1MessagePasserAddr)
+	if err != nil {
+		return eth.Bytes32{}, fmt.Errorf("withdrawals trie unavailable at block %v: %w", outBlock.Hash(), err)
+	}
+	return rollup.ComputeL2OutputRootV0(eth.HeaderBlockInfo(outBlock), withdrawalsTrie.Hash())
+}
+
+func (o *OracleEngine) GetPayload(ctx context.Context, payloadId eth.PayloadID) (*eth.ExecutionPayload, error) {
 	return o.api.GetPayloadV1(ctx, payloadId)
 }
 
-func (o OracleEngine) ForkchoiceUpdate(ctx context.Context, state *eth.ForkchoiceState, attr *eth.PayloadAttributes) (*eth.ForkchoiceUpdatedResult, error) {
+func (o *OracleEngine) ForkchoiceUpdate(ctx context.Context, state *eth.ForkchoiceState, attr *eth.PayloadAttributes) (*eth.ForkchoiceUpdatedResult, error) {
 	return o.api.ForkchoiceUpdatedV1(ctx, state, attr)
 }
 
-func (o OracleEngine) NewPayload(ctx context.Context, payload *eth.ExecutionPayload) (*eth.PayloadStatusV1, error) {
+func (o *OracleEngine) NewPayload(ctx context.Context, payload *eth.ExecutionPayload) (*eth.PayloadStatusV1, error) {
 	return o.api.NewPayloadV1(ctx, payload)
 }
 
-func (o OracleEngine) PayloadByHash(ctx context.Context, hash common.Hash) (*eth.ExecutionPayload, error) {
+func (o *OracleEngine) PayloadByHash(ctx context.Context, hash common.Hash) (*eth.ExecutionPayload, error) {
 	block := o.backend.GetBlockByHash(hash)
 	if block == nil {
 		return nil, ErrNotFound
@@ -53,7 +67,7 @@ func (o OracleEngine) PayloadByHash(ctx context.Context, hash common.Hash) (*eth
 	return eth.BlockAsPayload(block)
 }
 
-func (o OracleEngine) PayloadByNumber(ctx context.Context, n uint64) (*eth.ExecutionPayload, error) {
+func (o *OracleEngine) PayloadByNumber(ctx context.Context, n uint64) (*eth.ExecutionPayload, error) {
 	hash := o.backend.GetCanonicalHash(n)
 	if hash == (common.Hash{}) {
 		return nil, ErrNotFound
@@ -61,7 +75,7 @@ func (o OracleEngine) PayloadByNumber(ctx context.Context, n uint64) (*eth.Execu
 	return o.PayloadByHash(ctx, hash)
 }
 
-func (o OracleEngine) L2BlockRefByLabel(ctx context.Context, label eth.BlockLabel) (eth.L2BlockRef, error) {
+func (o *OracleEngine) L2BlockRefByLabel(ctx context.Context, label eth.BlockLabel) (eth.L2BlockRef, error) {
 	var header *types.Header
 	switch label {
 	case eth.Unsafe:
@@ -83,7 +97,7 @@ func (o OracleEngine) L2BlockRefByLabel(ctx context.Context, label eth.BlockLabe
 	return derive.L2BlockToBlockRef(block, &o.rollupCfg.Genesis)
 }
 
-func (o OracleEngine) L2BlockRefByHash(ctx context.Context, l2Hash common.Hash) (eth.L2BlockRef, error) {
+func (o *OracleEngine) L2BlockRefByHash(ctx context.Context, l2Hash common.Hash) (eth.L2BlockRef, error) {
 	block := o.backend.GetBlockByHash(l2Hash)
 	if block == nil {
 		return eth.L2BlockRef{}, ErrNotFound
@@ -91,7 +105,7 @@ func (o OracleEngine) L2BlockRefByHash(ctx context.Context, l2Hash common.Hash)
 	return derive.L2BlockToBlockRef(block, &o.rollupCfg.Genesis)
 }
 
-func (o OracleEngine) SystemConfigByL2Hash(ctx context.Context, hash common.Hash) (eth.SystemConfig, error) {
+func (o *OracleEngine) SystemConfigByL2Hash(ctx context.Context, hash common.Hash) (eth.SystemConfig, error) {
 	payload, err := o.PayloadByHash(ctx, hash)
 	if err != nil {
 		return eth.SystemConfig{}, err

op-program/client/l2/engine_backend_test.go

@@ -14,7 +14,6 @@ import (
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/stretchr/testify/require"
@@ -168,7 +167,7 @@ func setupOracle(t *testing.T, blockCount int, headBlockNumber int) (*params.Cha
 	genesisBlock := l2Genesis.MustCommit(db)
 	blocks, _ := core.GenerateChain(chainCfg, genesisBlock, consensus, db, blockCount, func(i int, gen *core.BlockGen) {})
 	blocks = append([]*types.Block{genesisBlock}, blocks...)
-	oracle := newStubBlockOracle(t, blocks[:headBlockNumber+1], db)
+	oracle := newStubOracleWithBlocks(t, blocks[:headBlockNumber+1], db)
 	return chainCfg, blocks, oracle
 }
 
@@ -195,30 +194,6 @@ func createBlock(t *testing.T, chain *OracleBackedL2Chain) *types.Block {
 	return blocks[0]
 }
 
-type stubBlockOracle struct {
-	blocks map[common.Hash]*types.Block
-	kvStateOracle
-}
-
-func newStubBlockOracle(t *testing.T, chain []*types.Block, db ethdb.Database) *stubBlockOracle {
-	blocks := make(map[common.Hash]*types.Block, len(chain))
-	for _, block := range chain {
-		blocks[block.Hash()] = block
-	}
-	return &stubBlockOracle{
-		blocks:        blocks,
-		kvStateOracle: kvStateOracle{t: t, source: db},
-	}
-}
-
-func (o stubBlockOracle) BlockByHash(blockHash common.Hash) *types.Block {
-	block, ok := o.blocks[blockHash]
-	if !ok {
-		o.t.Fatalf("requested unknown block %s", blockHash)
-	}
-	return block
-}
-
 func TestEngineAPITests(t *testing.T) {
 	test.RunEngineAPITests(t, func(t *testing.T) engineapi.EngineBackend {
 		_, chain := setupOracleBackedChain(t, 0)

op-program/client/l2/stub_oracle_test.go

+package l2
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethdb"
+)
+
+type stubBlockOracle struct {
+	t      *testing.T
+	blocks map[common.Hash]*types.Block
+	StateOracle
+}
+
+func newStubOracle(t *testing.T) (*stubBlockOracle, *stubStateOracle) {
+	stateOracle := newStubStateOracle(t)
+	blockOracle := stubBlockOracle{
+		t:           t,
+		blocks:      make(map[common.Hash]*types.Block),
+		StateOracle: stateOracle,
+	}
+	return &blockOracle, stateOracle
+}
+
+func newStubOracleWithBlocks(t *testing.T, chain []*types.Block, db ethdb.Database) *stubBlockOracle {
+	blocks := make(map[common.Hash]*types.Block, len(chain))
+	for _, block := range chain {
+		blocks[block.Hash()] = block
+	}
+	return &stubBlockOracle{
+		blocks:      blocks,
+		StateOracle: &kvStateOracle{t: t, source: db},
+	}
+}
+
+func (o stubBlockOracle) BlockByHash(blockHash common.Hash) *types.Block {
+	block, ok := o.blocks[blockHash]
+	if !ok {
+		o.t.Fatalf("requested unknown block %s", blockHash)
+	}
+	return block
+}
+
+// kvStateOracle loads data from a source ethdb.KeyValueStore
+type kvStateOracle struct {
+	t      *testing.T
+	source ethdb.KeyValueStore
+}
+
+func (o *kvStateOracle) NodeByHash(nodeHash common.Hash) []byte {
+	val, err := o.source.Get(nodeHash.Bytes())
+	if err != nil {
+		o.t.Fatalf("error retrieving node %v: %v", nodeHash, err)
+	}
+	return val
+}
+
+func (o *kvStateOracle) CodeByHash(hash common.Hash) []byte {
+	return rawdb.ReadCode(o.source, hash)
+}
+
+func newStubStateOracle(t *testing.T) *stubStateOracle {
+	return &stubStateOracle{
+		t:    t,
+		data: make(map[common.Hash][]byte),
+		code: make(map[common.Hash][]byte),
+	}
+}
+
+// Stub StateOracle implementation that reads from simple maps
+type stubStateOracle struct {
+	t    *testing.T
+	data map[common.Hash][]byte
+	code map[common.Hash][]byte
+}
+
+func (o *stubStateOracle) NodeByHash(nodeHash common.Hash) []byte {
+	data, ok := o.data[nodeHash]
+	if !ok {
+		o.t.Fatalf("no value for node %v", nodeHash)
+	}
+	return data
+}
+
+func (o *stubStateOracle) CodeByHash(hash common.Hash) []byte {
+	data, ok := o.code[hash]
+	if !ok {
+		o.t.Fatalf("no value for code %v", hash)
+	}
+	return data
+}

op-program/host/cmd/main.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/ethereum-optimism/optimism/op-node/chaincfg"
+	"github.com/ethereum-optimism/optimism/op-node/eth"
 	"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
 	cldr "github.com/ethereum-optimism/optimism/op-program/client/driver"
 	"github.com/ethereum-optimism/optimism/op-program/host/config"
@@ -41,6 +42,10 @@ var VersionWithMeta = func() string {
 	return v
 }()
 
+var (
+	ErrClaimNotValid = errors.New("invalid claim")
+)
+
 func main() {
 	args := os.Args
 	err := run(args, FaultProofProgram)
@@ -124,6 +129,9 @@ func FaultProofProgram(logger log.Logger, cfg *config.Config) error {
 			return err
 		}
 	}
-	logger.Info("Derivation complete", "head", d.SafeHead())
+	claim := cfg.L2Claim
+	if !d.ValidateClaim(eth.Bytes32(claim)) {
+		return ErrClaimNotValid
+	}
 	return nil
 }

op-program/host/cmd/main_test.go

@@ -16,6 +16,7 @@ import (
 // Use HexToHash(...).Hex() to ensure the strings are the correct length for a hash
 var l1HeadValue = common.HexToHash("0x111111").Hex()
 var l2HeadValue = common.HexToHash("0x222222").Hex()
+var l2ClaimValue = common.HexToHash("0x333333").Hex()
 
 func TestLogLevel(t *testing.T) {
 	t.Run("RejectInvalid", func(t *testing.T) {
@@ -34,7 +35,12 @@ func TestLogLevel(t *testing.T) {
 
 func TestDefaultCLIOptionsMatchDefaultConfig(t *testing.T) {
 	cfg := configForArgs(t, addRequiredArgs())
-	defaultCfg := config.NewConfig(&chaincfg.Goerli, "genesis.json", common.HexToHash(l1HeadValue), common.HexToHash(l2HeadValue))
+	defaultCfg := config.NewConfig(
+		&chaincfg.Goerli,
+		"genesis.json",
+		common.HexToHash(l1HeadValue),
+		common.HexToHash(l2HeadValue),
+		common.HexToHash(l2ClaimValue))
 	require.Equal(t, defaultCfg, cfg)
 }
 
@@ -167,11 +173,26 @@ func TestL1RPCKind(t *testing.T) {
 // Offline support will be added later, but for now it just bails out with an error
 func TestOfflineModeNotSupported(t *testing.T) {
 	logger := log.New()
-	cfg := config.NewConfig(&chaincfg.Goerli, "genesis.json", common.HexToHash(l1HeadValue), common.HexToHash(l2HeadValue))
+	cfg := config.NewConfig(&chaincfg.Goerli, "genesis.json", common.HexToHash(l1HeadValue), common.HexToHash(l2HeadValue), common.HexToHash(l2ClaimValue))
 	err := FaultProofProgram(logger, cfg)
 	require.ErrorContains(t, err, "offline mode not supported")
 }
 
+func TestL2Claim(t *testing.T) {
+	t.Run("Required", func(t *testing.T) {
+		verifyArgsInvalid(t, "flag l2.claim is required", addRequiredArgsExcept("--l2.claim"))
+	})
+
+	t.Run("Valid", func(t *testing.T) {
+		cfg := configForArgs(t, replaceRequiredArg("--l2.claim", l2ClaimValue))
+		require.EqualValues(t, common.HexToHash(l2ClaimValue), cfg.L2Claim)
+	})
+
+	t.Run("Invalid", func(t *testing.T) {
+		verifyArgsInvalid(t, config.ErrInvalidL2Claim.Error(), replaceRequiredArg("--l2.claim", "something"))
+	})
+}
+
 func verifyArgsInvalid(t *testing.T, messageContains string, cliArgs []string) {
 	_, _, err := runWithArgs(cliArgs)
 	require.ErrorContains(t, err, messageContains)
@@ -220,6 +241,7 @@ func requiredArgs() map[string]string {
 		"--network":    "goerli",
 		"--l1.head":    l1HeadValue,
 		"--l2.head":    l2HeadValue,
+		"--l2.claim":   l2ClaimValue,
 		"--l2.genesis": "genesis.json",
 	}
 }

op-program/host/config/config.go

@@ -17,6 +17,7 @@ var (
 	ErrInvalidL1Head       = errors.New("invalid l1 head")
 	ErrInvalidL2Head       = errors.New("invalid l2 head")
 	ErrL1AndL2Inconsistent = errors.New("l1 and l2 options must be specified together or both omitted")
+	ErrInvalidL2Claim      = errors.New("invalid l2 claim")
 )
 
 type Config struct {
@@ -25,6 +26,7 @@ type Config struct {
 	L2GenesisPath string
 	L1Head        common.Hash
 	L2Head        common.Hash
+	L2Claim       common.Hash
 	L1URL         string
 	L1TrustRPC    bool
 	L1RPCKind     sources.RPCProviderKind
@@ -43,6 +45,9 @@ func (c *Config) Check() error {
 	if c.L2Head == (common.Hash{}) {
 		return ErrInvalidL2Head
 	}
+	if c.L2Claim == (common.Hash{}) {
+		return ErrInvalidL2Claim
+	}
 	if c.L2GenesisPath == "" {
 		return ErrMissingL2Genesis
 	}
@@ -57,12 +62,13 @@ func (c *Config) FetchingEnabled() bool {
 }
 
 // NewConfig creates a Config with all optional values set to the CLI default value
-func NewConfig(rollupCfg *rollup.Config, l2GenesisPath string, l1Head common.Hash, l2Head common.Hash) *Config {
+func NewConfig(rollupCfg *rollup.Config, l2GenesisPath string, l1Head common.Hash, l2Head common.Hash, l2Claim common.Hash) *Config {
 	return &Config{
 		Rollup:        rollupCfg,
 		L2GenesisPath: l2GenesisPath,
 		L1Head:        l1Head,
 		L2Head:        l2Head,
+		L2Claim:       l2Claim,
 		L1RPCKind:     sources.RPCKindBasic,
 	}
 }
@@ -79,6 +85,10 @@ func NewConfigFromCLI(ctx *cli.Context) (*Config, error) {
 	if l2Head == (common.Hash{}) {
 		return nil, ErrInvalidL2Head
 	}
+	l2Claim := common.HexToHash(ctx.GlobalString(flags.L2Claim.Name))
+	if l2Claim == (common.Hash{}) {
+		return nil, ErrInvalidL2Claim
+	}
 	l1Head := common.HexToHash(ctx.GlobalString(flags.L1Head.Name))
 	if l1Head == (common.Hash{}) {
 		return nil, ErrInvalidL1Head
@@ -88,6 +98,7 @@ func NewConfigFromCLI(ctx *cli.Context) (*Config, error) {
 		L2URL:         ctx.GlobalString(flags.L2NodeAddr.Name),
 		L2GenesisPath: ctx.GlobalString(flags.L2GenesisPath.Name),
 		L2Head:        l2Head,
+		L2Claim:       l2Claim,
 		L1Head:        l1Head,
 		L1URL:         ctx.GlobalString(flags.L1NodeAddr.Name),
 		L1TrustRPC:    ctx.GlobalBool(flags.L1TrustRPC.Name),

op-program/host/config/config_test.go

@@ -11,58 +11,78 @@ import (
 
 var validRollupConfig = &chaincfg.Goerli
 var validL2GenesisPath = "genesis.json"
-var validL1Head = common.HexToHash("0x112233889988FF")
-var validL2Head = common.HexToHash("0x6303578b1fa9480389c51bbcef6fe045bb877da39740819e9eb5f36f94949bd0")
+var validL1Head = common.Hash{0xaa}
+var validL2Head = common.Hash{0xbb}
+var validL2Claim = common.Hash{0xcc}
 
 func TestDefaultConfigIsValid(t *testing.T) {
-	err := NewConfig(validRollupConfig, validL2GenesisPath, validL1Head, validL2Head).Check()
+	err := validConfig().Check()
 	require.NoError(t, err)
 }
 
 func TestRollupConfig(t *testing.T) {
 	t.Run("Required", func(t *testing.T) {
-		err := NewConfig(nil, validL2GenesisPath, validL1Head, validL2Head).Check()
+		config := validConfig()
+		config.Rollup = nil
+		err := config.Check()
 		require.ErrorIs(t, err, ErrMissingRollupConfig)
 	})
 
 	t.Run("Invalid", func(t *testing.T) {
-		err := NewConfig(&rollup.Config{}, validL2GenesisPath, validL1Head, validL2Head).Check()
+		config := validConfig()
+		config.Rollup = &rollup.Config{}
+		err := config.Check()
 		require.ErrorIs(t, err, rollup.ErrBlockTimeZero)
 	})
 }
 
 func TestL1HeadRequired(t *testing.T) {
-	err := NewConfig(validRollupConfig, validL2GenesisPath, common.Hash{}, validL2Head).Check()
+	config := validConfig()
+	config.L1Head = common.Hash{}
+	err := config.Check()
 	require.ErrorIs(t, err, ErrInvalidL1Head)
 }
 
 func TestL2HeadRequired(t *testing.T) {
-	err := NewConfig(validRollupConfig, validL2GenesisPath, validL1Head, common.Hash{}).Check()
+	config := validConfig()
+	config.L2Head = common.Hash{}
+	err := config.Check()
 	require.ErrorIs(t, err, ErrInvalidL2Head)
 }
 
+func TestL2ClaimRequired(t *testing.T) {
+	config := validConfig()
+	config.L2Claim = common.Hash{}
+	err := config.Check()
+	require.ErrorIs(t, err, ErrInvalidL2Claim)
+}
+
 func TestL2GenesisRequired(t *testing.T) {
-	err := NewConfig(validRollupConfig, "", validL1Head, validL2Head).Check()
+	config := validConfig()
+	config.L2GenesisPath = ""
+	err := config.Check()
 	require.ErrorIs(t, err, ErrMissingL2Genesis)
 }
 
 func TestFetchingArgConsistency(t *testing.T) {
 	t.Run("RequireL2WhenL1Set", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L1URL = "https://example.com:1234"
 		require.ErrorIs(t, cfg.Check(), ErrL1AndL2Inconsistent)
 	})
 	t.Run("RequireL1WhenL2Set", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L2URL = "https://example.com:1234"
 		require.ErrorIs(t, cfg.Check(), ErrL1AndL2Inconsistent)
 	})
 	t.Run("AllowNeitherSet", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
+		cfg.L1URL = ""
+		cfg.L2URL = ""
 		require.NoError(t, cfg.Check())
 	})
 	t.Run("AllowBothSet", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L1URL = "https://example.com:1234"
 		cfg.L2URL = "https://example.com:4678"
 		require.NoError(t, cfg.Check())
@@ -71,32 +91,36 @@ func TestFetchingArgConsistency(t *testing.T) {
 
 func TestFetchingEnabled(t *testing.T) {
 	t.Run("FetchingNotEnabledWhenNoFetcherUrlsSpecified", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		require.False(t, cfg.FetchingEnabled(), "Should not enable fetching when node URL not supplied")
 	})
 
 	t.Run("FetchingEnabledWhenFetcherUrlsSpecified", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L2URL = "https://example.com:1234"
 		require.False(t, cfg.FetchingEnabled(), "Should not enable fetching when node URL not supplied")
 	})
 
 	t.Run("FetchingNotEnabledWhenNoL1UrlSpecified", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L2URL = "https://example.com:1234"
 		require.False(t, cfg.FetchingEnabled(), "Should not enable L1 fetching when L1 node URL not supplied")
 	})
 
 	t.Run("FetchingNotEnabledWhenNoL2UrlSpecified", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L1URL = "https://example.com:1234"
 		require.False(t, cfg.FetchingEnabled(), "Should not enable L2 fetching when L2 node URL not supplied")
 	})
 
 	t.Run("FetchingEnabledWhenBothFetcherUrlsSpecified", func(t *testing.T) {
-		cfg := NewConfig(&chaincfg.Beta1, validL2GenesisPath, validL1Head, validL2Head)
+		cfg := validConfig()
 		cfg.L1URL = "https://example.com:1234"
 		cfg.L2URL = "https://example.com:5678"
 		require.True(t, cfg.FetchingEnabled(), "Should enable fetching when node URL supplied")
 	})
 }
+
+func validConfig() *Config {
+	return NewConfig(validRollupConfig, validL2GenesisPath, validL1Head, validL2Head, validL2Claim)
+}

op-program/host/flags/flags.go

@@ -41,6 +41,11 @@ var (
 		Usage:  "Hash of the agreed L2 block to start derivation from",
 		EnvVar: service.PrefixEnvVar(envVarPrefix, "L2_HEAD"),
 	}
+	L2Claim = cli.StringFlag{
+		Name:   "l2.claim",
+		Usage:  "Claimed L2 output root to validate",
+		EnvVar: service.PrefixEnvVar(envVarPrefix, "L2_CLAIM"),
+	}
 	L2GenesisPath = cli.StringFlag{
 		Name:   "l2.genesis",
 		Usage:  "Path to the op-geth genesis file",
@@ -71,13 +76,16 @@ var (
 // Flags contains the list of configuration options available to the binary.
 var Flags []cli.Flag
 
+var requiredFlags = []cli.Flag{
+	L1Head,
+	L2Head,
+	L2Claim,
+	L2GenesisPath,
+}
 var programFlags = []cli.Flag{
 	RollupConfig,
 	Network,
 	L2NodeAddr,
-	L1Head,
-	L2Head,
-	L2GenesisPath,
 	L1NodeAddr,
 	L1TrustRPC,
 	L1RPCProviderKind,
@@ -85,6 +93,7 @@ var programFlags = []cli.Flag{
 
 func init() {
 	Flags = append(Flags, oplog.CLIFlags(envVarPrefix)...)
+	Flags = append(Flags, requiredFlags...)
 	Flags = append(Flags, programFlags...)
 }
 
@@ -97,14 +106,10 @@ func CheckRequired(ctx *cli.Context) error {
 	if rollupConfig != "" && network != "" {
 		return fmt.Errorf("cannot specify both %s and %s", RollupConfig.Name, Network.Name)
 	}
-	if ctx.GlobalString(L2GenesisPath.Name) == "" {
-		return fmt.Errorf("flag %s is required", L2GenesisPath.Name)
-	}
-	if ctx.GlobalString(L2Head.Name) == "" {
-		return fmt.Errorf("flag %s is required", L2Head.Name)
-	}
-	if ctx.GlobalString(L1Head.Name) == "" {
-		return fmt.Errorf("flag %s is required", L1Head.Name)
+	for _, flag := range requiredFlags {
+		if ctx.GlobalString(flag.GetName()) == "" {
+			return fmt.Errorf("flag %s is required", flag.GetName())
+		}
 	}
 	return nil
 }

op-program/host/l1/fetcher.go

@@ -30,7 +30,7 @@ func NewFetchingL1Oracle(ctx context.Context, logger log.Logger, source Source)
 	}
 }
 
-func (o FetchingL1Oracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo {
+func (o *FetchingL1Oracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo {
 	o.logger.Trace("HeaderByBlockHash", "hash", blockHash)
 	info, err := o.source.InfoByHash(o.ctx, blockHash)
 	if err != nil {
@@ -42,7 +42,7 @@ func (o FetchingL1Oracle) HeaderByBlockHash(blockHash common.Hash) eth.BlockInfo
 	return info
 }
 
-func (o FetchingL1Oracle) TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions) {
+func (o *FetchingL1Oracle) TransactionsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Transactions) {
 	o.logger.Trace("TransactionsByBlockHash", "hash", blockHash)
 	info, txs, err := o.source.InfoAndTxsByHash(o.ctx, blockHash)
 	if err != nil {
@@ -54,7 +54,7 @@ func (o FetchingL1Oracle) TransactionsByBlockHash(blockHash common.Hash) (eth.Bl
 	return info, txs
 }
 
-func (o FetchingL1Oracle) ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts) {
+func (o *FetchingL1Oracle) ReceiptsByBlockHash(blockHash common.Hash) (eth.BlockInfo, types.Receipts) {
 	o.logger.Trace("ReceiptsByBlockHash", "hash", blockHash)
 	info, rcpts, err := o.source.FetchReceipts(o.ctx, blockHash)
 	if err != nil {

op-program/host/l1/l1.go

@@ -21,6 +21,6 @@ func NewFetchingL1(ctx context.Context, logger log.Logger, cfg *config.Config) (
 	if err != nil {
 		return nil, err
 	}
-	oracle := NewFetchingL1Oracle(ctx, logger, source)
+	oracle := cll1.NewCachingOracle(NewFetchingL1Oracle(ctx, logger, source))
 	return cll1.NewOracleL1Client(logger, oracle, cfg.L1Head), err
 }

op-program/host/l2/l2.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
 	cll2 "github.com/ethereum-optimism/optimism/op-program/client/l2"
 	"github.com/ethereum-optimism/optimism/op-program/host/config"
 	"github.com/ethereum/go-ethereum/core"
@@ -14,15 +13,16 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 )
 
-func NewFetchingEngine(ctx context.Context, logger log.Logger, cfg *config.Config) (derive.Engine, error) {
+func NewFetchingEngine(ctx context.Context, logger log.Logger, cfg *config.Config) (*cll2.OracleEngine, error) {
 	genesis, err := loadL2Genesis(cfg)
 	if err != nil {
 		return nil, err
 	}
-	oracle, err := NewFetchingL2Oracle(ctx, logger, cfg.L2URL, cfg.L2Head)
+	fetcher, err := NewFetchingL2Oracle(ctx, logger, cfg.L2URL, cfg.L2Head)
 	if err != nil {
 		return nil, fmt.Errorf("connect l2 oracle: %w", err)
 	}
+	oracle := cll2.NewCachingOracle(fetcher)
 
 	engineBackend, err := cll2.NewOracleBackedL2Chain(logger, oracle, genesis, cfg.L2Head)
 	if err != nil {

packages/contracts-bedrock/contracts/L1/SystemConfig.sol

@@ -80,7 +80,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
     event ConfigUpdate(uint256 indexed version, UpdateType indexed updateType, bytes data);
 
     /**
-     * @custom:semver 1.2.0
+     * @custom:semver 1.3.0
      *
      * @param _owner             Initial owner of the contract.
      * @param _overhead          Initial overhead value.
@@ -98,7 +98,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
         uint64 _gasLimit,
         address _unsafeBlockSigner,
         ResourceMetering.ResourceConfig memory _config
-    ) Semver(1, 2, 0) {
+    ) Semver(1, 3, 0) {
         initialize({
             _owner: _owner,
             _overhead: _overhead,
@@ -270,7 +270,7 @@ contract SystemConfig is OwnableUpgradeable, Semver {
             "SystemConfig: min base fee must be less than max base"
         );
         // Base fee change denominator must be greater than 0.
-        require(_config.baseFeeMaxChangeDenominator > 0, "SystemConfig: denominator cannot be 0");
+        require(_config.baseFeeMaxChangeDenominator > 1, "SystemConfig: denominator must be larger than 1");
         // Max resource limit plus system tx gas must be less than or equal to the L2 gas limit.
         // The gas limit must be increased before these values can be increased.
         require(

packages/contracts-bedrock/contracts/test/OptimismPortal.t.sol

@@ -1085,3 +1085,88 @@ contract OptimismPortalUpgradeable_Test is Portal_Initializer {
         assertEq(slot21Expected, slot21After);
     }
 }
+
+/**
+ * @title OptimismPortalResourceFuzz_Test
+ * @dev Test various values of the resource metering config to ensure that deposits cannot be
+ *         broken by changing the config.
+ */
+contract OptimismPortalResourceFuzz_Test is Portal_Initializer {
+
+    /**
+     * @dev The max gas limit observed throughout this test. Setting this too high can cause
+     *      the test to take too long to run.
+     */
+    uint256 constant MAX_GAS_LIMIT = 30_000_000;
+
+    /**
+     * @dev Test that various values of the resource metering config will not break deposits.
+     */
+    function testFuzz_systemConfigDeposit_succeeds(
+        uint32 _maxResourceLimit,
+        uint8 _elasticityMultiplier,
+        uint8 _baseFeeMaxChangeDenominator,
+        uint32 _minimumBaseFee,
+        uint32 _systemTxMaxGas,
+        uint128 _maximumBaseFee,
+        uint64 _gasLimit,
+        uint64 _prevBoughtGas,
+        uint128 _prevBaseFee,
+        uint8 _blockDiff
+    ) external {
+        // Get the set system gas limit
+        uint64 gasLimit = systemConfig.gasLimit();
+        // Bound resource config
+        _maxResourceLimit = uint32(bound(_maxResourceLimit, 21000, MAX_GAS_LIMIT / 8));
+        _gasLimit = uint64(bound( _gasLimit,  21000, _maxResourceLimit));
+        _prevBaseFee = uint128(bound(_prevBaseFee, 0, 5 gwei));
+        // Prevent values that would cause reverts
+        vm.assume(gasLimit >= _gasLimit);
+        vm.assume(_minimumBaseFee < _maximumBaseFee);
+        vm.assume(_baseFeeMaxChangeDenominator > 1);
+        vm.assume(uint256(_maxResourceLimit) + uint256(_systemTxMaxGas) <= gasLimit);
+        vm.assume(_elasticityMultiplier > 0);
+        vm.assume(
+            ((_maxResourceLimit / _elasticityMultiplier) * _elasticityMultiplier) == _maxResourceLimit
+        );
+        _prevBoughtGas = uint64(bound(_prevBoughtGas, 0, _maxResourceLimit - _gasLimit));
+        _blockDiff = uint8(bound(_blockDiff, 0, 3));
+
+        // Create a resource config to mock the call to the system config with
+        ResourceMetering.ResourceConfig memory rcfg = ResourceMetering.ResourceConfig({
+            maxResourceLimit: _maxResourceLimit,
+            elasticityMultiplier: _elasticityMultiplier,
+            baseFeeMaxChangeDenominator: _baseFeeMaxChangeDenominator,
+            minimumBaseFee: _minimumBaseFee,
+            systemTxMaxGas: _systemTxMaxGas,
+            maximumBaseFee: _maximumBaseFee
+        });
+        vm.mockCall(
+            address(systemConfig),
+            abi.encodeWithSelector(systemConfig.resourceConfig.selector),
+            abi.encode(rcfg)
+        );
+
+        // Set the resource params
+        uint256 _prevBlockNum = block.number - _blockDiff;
+        vm.store(
+            address(op),
+            bytes32(uint256(1)),
+            bytes32((_prevBlockNum << 192) | (uint256(_prevBoughtGas) << 128) | _prevBaseFee)
+        );
+        // Ensure that the storage setting is correct
+        (uint128 prevBaseFee, uint64 prevBoughtGas, uint64 prevBlockNum) = op.params();
+        assertEq(prevBaseFee, _prevBaseFee);
+        assertEq(prevBoughtGas, _prevBoughtGas);
+        assertEq(prevBlockNum, _prevBlockNum);
+
+        // Do a deposit, should not revert
+        op.depositTransaction{ gas: MAX_GAS_LIMIT }({
+            _to: address(0x20),
+            _value: 0x40,
+            _gasLimit: _gasLimit,
+            _isCreation: false,
+            _data: hex""
+        });
+    }
+}

packages/contracts-bedrock/contracts/test/SystemConfig.t.sol

@@ -110,7 +110,7 @@ contract SystemConfig_Setters_TestFail is SystemConfig_Init {
             maximumBaseFee: 2 gwei
         });
         vm.prank(sysConf.owner());
-        vm.expectRevert("SystemConfig: denominator cannot be 0");
+        vm.expectRevert("SystemConfig: denominator must be larger than 1");
         sysConf.setResourceConfig(config);
     }