Ingest Block Batches (#8)

Handling BlockBatches in Geth at `SendBlockBatches` endpoint (eth_sendBlockBatches) Other: * Adding PR template * Adding ability to set timestamp and making blocks use configured timestamp * Adding ability to encode original tx nonce in calldata * Adding L1MessageSender to Contract Creation Txs
2020-06-23 16:50:40 -05:00 · 2020-06-23 16:50:40 -05:00 · 83c7d841eb
commit 83c7d841eb
parent 0a67cf87f3
25 changed files with 700 additions and 79 deletions
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@ -1,40 +1,89 @@
 # Contributing

-Thank you for considering to help out with the source code! We welcome 
-contributions from anyone on the internet, and are grateful for even the 
-smallest of fixes!
+When contributing to this repository, please first discuss the change you wish to make via issue,
+email, or any other method with the owners of this repository before making a change. 

-If you'd like to contribute to go-ethereum, please fork, fix, commit and send a 
-pull request for the maintainers to review and merge into the main code base. If
-you wish to submit more complex changes though, please check up with the core 
-devs first on [our gitter channel](https://gitter.im/ethereum/go-ethereum) to 
-ensure those changes are in line with the general philosophy of the project 
-and/or get some early feedback which can make both your efforts much lighter as
-well as our review and merge procedures quick and simple.
+Please note we have a code of conduct, please follow it in all your interactions with the project.

-## Coding guidelines
+## Pull Request Process

-Please make sure your contributions adhere to our coding guidelines:
+1. Ensure that tests pass and code is lint free: `make all && make test && make lint`
+2. Update the README.md if any changes invalidate its current content.
+3. Include any tests for new functionality.
+4. Reference any relevant issues in your PR comment.

- * Code must adhere to the official Go 
-[formatting](https://golang.org/doc/effective_go.html#formatting) guidelines 
-(i.e. uses [gofmt](https://golang.org/cmd/gofmt/)).
- * Code must be documented adhering to the official Go 
-[commentary](https://golang.org/doc/effective_go.html#commentary) guidelines.
- * Pull requests need to be based on and opened against the `master` branch.
- * Commit messages should be prefixed with the package(s) they modify.
-   * E.g. "eth, rpc: make trace configs optional"
+## Code of Conduct

-## Can I have feature X
+### Our Pledge

-Before you submit a feature request, please check and make sure that it isn't 
-possible through some other means. The JavaScript-enabled console is a powerful 
-feature in the right hands. Please check our 
-[Wiki page](https://github.com/ethereum/go-ethereum/wiki) for more info
-and help.
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.

-## Configuration, dependencies, and tests
+### Our Standards

-Please see the [Developers' Guide](https://github.com/ethereum/go-ethereum/wiki/Developers'-Guide)
-for more details on configuring your environment, managing project dependencies
-and testing procedures.
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+### Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+### Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+### Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at contributing@optimism.io. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+### Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at [http://contributor-covenant.org/version/1/4][version] and from the [Angular Seed Contributing Guide][angular-contrib].
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/
+[angular-contrib]: https://github.com/mgechev/angular-seed/blob/master/.github/CONTRIBUTING.md
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@ -0,0 +1,17 @@
+## Description
+
+## Questions
+- 
+-
+-
+
+## Metadata
+### Fixes
+- Fixes # [Link to Issue]
+
+## Contributing Agreement
+<!--
+You *must* read and fully understand our Contributing Guide and Code of Conduct before submitting this pull request. Strong, healthy, and respectful communities are the best way to build great code 💖.
+-->
+
+- [ ] I have read and understood the [Optimism Contributing Guide and Code of Conduct](./CONTRIBUTING.md) and am following those guidelines in this pull request.
--- a/accounts/abi/bind/backends/simulated_test.go
+++ b/accounts/abi/bind/backends/simulated_test.go
@ -58,7 +58,7 @@ func TestSimulatedBackend(t *testing.T) {
 	// generate a transaction and confirm you can retrieve it
 	code := `6060604052600a8060106000396000f360606040526008565b00`
 	var gas uint64 = 3000000
-	tx := types.NewContractCreation(0, big.NewInt(0), gas, big.NewInt(1), common.FromHex(code))
+	tx := types.NewContractCreation(0, big.NewInt(0), gas, big.NewInt(1), common.FromHex(code), nil)
 	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, key)

 	err = sim.SendTransaction(context.Background(), tx)
--- a/accounts/abi/bind/base.go
+++ b/accounts/abi/bind/base.go
@ -227,7 +227,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
 	// Create the transaction, sign it and schedule it for execution
 	var rawTx *types.Transaction
 	if contract == nil {
-		rawTx = types.NewContractCreation(nonce, value, gasLimit, gasPrice, input)
+		rawTx = types.NewContractCreation(nonce, value, gasLimit, gasPrice, input, nil)
 	} else {
 		rawTx = types.NewTransaction(nonce, c.address, value, gasLimit, gasPrice, input, nil)
 	}
--- a/accounts/abi/bind/util_test.go
+++ b/accounts/abi/bind/util_test.go
@ -62,7 +62,7 @@ func TestWaitDeployed(t *testing.T) {
 		defer backend.Close()

 		// Create the transaction.
-		tx := types.NewContractCreation(0, big.NewInt(0), test.gas, big.NewInt(1), common.FromHex(test.code))
+		tx := types.NewContractCreation(0, big.NewInt(0), test.gas, big.NewInt(1), common.FromHex(test.code), nil)
 		tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)

 		// Wait for it to get mined in the background.
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@ -254,7 +254,7 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
 			return consensus.ErrFutureBlock
 		}
 	}
-	if header.Time <= parent.Time {
+	if header.Time < parent.Time {
 		return errOlderBlockTime
 	}
 	// Verify the block's difficulty based on its timestamp and parent's difficulty
--- a/core/blockchain.go
+++ b/core/blockchain.go
@ -151,6 +151,8 @@ type BlockChain struct {

 	chainmu sync.RWMutex // blockchain insertion lock

+	currentTimestamp atomic.Value // Timestamp to be used when mining the current block.
+
 	currentBlock     atomic.Value // Current head of the block chain
 	currentFastBlock atomic.Value // Current head of the fast-sync chain (may be above the block chain!)

@ -234,6 +236,9 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
 	bc.currentBlock.Store(nilBlock)
 	bc.currentFastBlock.Store(nilBlock)

+	// TODO: Make default current timestamp configurable & make 0 if genesis else load from last block?
+	bc.SetCurrentTimestamp(int64(0))
+
 	// Initialize the chain with ancient data if it isn't empty.
 	if bc.empty() {
 		rawdb.InitDatabaseFromFreezer(bc.db)
@ -495,6 +500,17 @@ func (bc *BlockChain) GasLimit() uint64 {
 	return bc.CurrentBlock().GasLimit()
 }

+// SetCurrentTimestamp sets the timestamp for blocks added to the canonical chain.
+func (bc *BlockChain) SetCurrentTimestamp(timestamp int64) {
+	bc.currentTimestamp.Store(&timestamp)
+}
+
+// CurrentTimestamp retrieves the timestamp used for blocks added to the canonical chain.
+func (bc *BlockChain) CurrentTimestamp() int64 {
+	// Note: Can never be nil
+	return *bc.currentTimestamp.Load().(*int64)
+}
+
 // CurrentBlock retrieves the current head block of the canonical chain. The
 // block is retrieved from the blockchain's internal cache.
 func (bc *BlockChain) CurrentBlock() *types.Block {
--- a/core/blockchain_test.go
+++ b/core/blockchain_test.go
@ -949,7 +949,7 @@ func TestLogReorgs(t *testing.T) {
 	blockchain.SubscribeRemovedLogsEvent(rmLogsCh)
 	chain, _ := GenerateChain(params.TestChainConfig, genesis, ethash.NewFaker(), db, 2, func(i int, gen *BlockGen) {
 		if i == 1 {
-			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code), signer, key1)
+			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code, nil), signer, key1)
 			if err != nil {
 				t.Fatalf("failed to create tx: %v", err)
 			}
@ -1042,7 +1042,7 @@ func TestLogRebirth(t *testing.T) {

 	chain, _ := GenerateChain(params.TestChainConfig, genesis, ethash.NewFaker(), db, 2, func(i int, gen *BlockGen) {
 		if i == 1 {
-			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code), signer, key1)
+			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code, nil), signer, key1)
 			if err != nil {
 				t.Fatalf("failed to create tx: %v", err)
 			}
@ -1062,7 +1062,7 @@ func TestLogRebirth(t *testing.T) {
 	// Generate long reorg chain
 	forkChain, _ := GenerateChain(params.TestChainConfig, genesis, ethash.NewFaker(), db, 2, func(i int, gen *BlockGen) {
 		if i == 1 {
-			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code), signer, key1)
+			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code, nil), signer, key1)
 			if err != nil {
 				t.Fatalf("failed to create tx: %v", err)
 			}
@ -1162,7 +1162,7 @@ func TestSideLogRebirth(t *testing.T) {
 	// Generate side chain with lower difficulty
 	sideChain, _ := GenerateChain(params.TestChainConfig, genesis, ethash.NewFaker(), db, 2, func(i int, gen *BlockGen) {
 		if i == 1 {
-			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code), signer, key1)
+			tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), code, nil), signer, key1)
 			if err != nil {
 				t.Fatalf("failed to create tx: %v", err)
 			}
@ -1207,7 +1207,7 @@ func TestReorgSideEvent(t *testing.T) {
 	}

 	replacementBlocks, _ := GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, 4, func(i int, gen *BlockGen) {
-		tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), nil), signer, key1)
+		tx, err := types.SignTx(types.NewContractCreation(gen.TxNonce(addr1), new(big.Int), 1000000, new(big.Int), nil, nil), signer, key1)
 		if i == 2 {
 			gen.OffsetTime(-9)
 		}
--- a/core/types/receipt_test.go
+++ b/core/types/receipt_test.go
@ -155,7 +155,7 @@ func encodeAsV3StoredReceiptRLP(want *Receipt) ([]byte, error) {
 func TestDeriveFields(t *testing.T) {
 	// Create a few transactions to have receipts for
 	txs := Transactions{
-		NewContractCreation(1, big.NewInt(1), 1, big.NewInt(1), nil),
+		NewContractCreation(1, big.NewInt(1), 1, big.NewInt(1), nil, nil),
 		NewTransaction(2, common.HexToAddress("0x2"), big.NewInt(2), 2, big.NewInt(2), nil, nil),
 	}
 	// Create the corresponding receipts
--- a/core/types/transaction.go
+++ b/core/types/transaction.go
@ -19,6 +19,7 @@ package types
 import (
 	"container/heap"
 	"errors"
+	"fmt"
 	"io"
 	"math/big"
 	"sync/atomic"
@ -76,8 +77,8 @@ func NewTransaction(nonce uint64, to common.Address, amount *big.Int, gasLimit u
 	return newTransaction(nonce, &to, amount, gasLimit, gasPrice, data, l1MessageSender)
 }

-func NewContractCreation(nonce uint64, amount *big.Int, gasLimit uint64, gasPrice *big.Int, data []byte) *Transaction {
-	return newTransaction(nonce, nil, amount, gasLimit, gasPrice, data, nil)
+func NewContractCreation(nonce uint64, amount *big.Int, gasLimit uint64, gasPrice *big.Int, data []byte, l1MessageSender *common.Address) *Transaction {
+	return newTransaction(nonce, nil, amount, gasLimit, gasPrice, data, l1MessageSender)
 }

 func newTransaction(nonce uint64, to *common.Address, amount *big.Int, gasLimit uint64, gasPrice *big.Int, data []byte, l1MessageSender *common.Address) *Transaction {
@ -106,6 +107,29 @@ func newTransaction(nonce uint64, to *common.Address, amount *big.Int, gasLimit
 	return &Transaction{data: d}
 }

+// Appends the provided 64-bit nonce to this Transaction's calldata as the last 4 bytes
+func (t *Transaction) AddNonceToWrappedTransaction(nonce uint64) {
+	bytes := make([]byte, 8)
+	for i := range bytes {
+		bytes[i] = 0xFF & byte(nonce>>(56-i))
+	}
+	t.data.Payload = append(t.data.Payload, bytes...)
+}
+
+// Parses the encoded nonce from this Transaction's calldata and returns it as well as the calldata without the encoded nonce.
+func (t *Transaction) GetNonceAndCalldataFromWrappedTransaction() (uint64, []byte, error) {
+	if len(t.data.Payload) < 8 {
+		return 0, nil, fmt.Errorf("Cannot parse encoded nonce out of calldata of less than 8 bytes in length. Calldata: %x", t.data.Payload)
+	}
+
+	nonceBytes := t.data.Payload[len(t.data.Payload)-8:]
+	nonce := uint64(0)
+	for i := range nonceBytes {
+		nonce += uint64(nonceBytes[i] << (56 - i))
+	}
+	return nonce, t.data.Payload[:len(t.data.Payload)-8], nil
+}
+
 // ChainId returns which chain id this transaction was signed for (if at all)
 func (tx *Transaction) ChainId() *big.Int {
 	return deriveChainId(tx.data.V)
--- a/core/types/transaction_test.go
+++ b/core/types/transaction_test.go
@ -190,7 +190,7 @@ func TestTransactionJSON(t *testing.T) {
 		case 0:
 			tx = NewTransaction(i, common.Address{1}, common.Big0, 1, common.Big2, []byte("abcdef"), &sender)
 		case 1:
-			tx = NewContractCreation(i, common.Big0, 1, common.Big2, []byte("abcdef"))
+			tx = NewContractCreation(i, common.Big0, 1, common.Big2, []byte("abcdef"), nil)
 		}
 		transactions = append(transactions, tx)

--- a/crypto/signature_cgo.go
+++ b/crypto/signature_cgo.go
@ -60,6 +60,14 @@ func Sign(digestHash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
 	return secp256k1.Sign(digestHash, seckey)
 }

+func VerifyMessageSignature(pubKey, unhashedMessage, signature []byte) bool {
+	if len(signature) < 64 || len(signature) > 65 {
+		// signature format may be [R || S] or [R || S || V]
+		return false
+	}
+	return VerifySignature(pubKey, Keccak256(unhashedMessage), signature[0:64])
+}
+
 // VerifySignature checks that the given public key created signature over digest.
 // The public key should be in compressed (33 bytes) or uncompressed (65 bytes) format.
 // The signature should have the 64 byte [R || S] format.
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@ -226,6 +226,14 @@ func (b *EthAPIBackend) SendTx(ctx context.Context, signedTx *types.Transaction)
 	return b.eth.txPool.AddLocal(signedTx)
 }

+func (b *EthAPIBackend) SendTxs(ctx context.Context, signedTxs []*types.Transaction) []error {
+	return b.eth.txPool.AddLocals(signedTxs)
+}
+
+func (b *EthAPIBackend) SetTimestamp(timestamp int64) {
+	b.eth.blockchain.SetCurrentTimestamp(timestamp)
+}
+
 func (b *EthAPIBackend) GetPoolTransactions() (types.Transactions, error) {
 	pending, err := b.eth.txPool.Pending()
 	if err != nil {
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@ -19,6 +19,8 @@ package ethapi
 import (
 	"bytes"
 	"context"
+	"crypto/ecdsa"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"math/big"
@ -1179,13 +1181,19 @@ func newRPCTransactionFromBlockHash(b *types.Block, hash common.Hash) *RPCTransa

 // PublicTransactionPoolAPI exposes methods for the RPC interface
 type PublicTransactionPoolAPI struct {
-	b         Backend
-	nonceLock *AddrLocker
+	b           Backend
+	nonceLock   *AddrLocker
+	batchSigner *ecdsa.PrivateKey
 }

 // NewPublicTransactionPoolAPI creates a new RPC service with methods specific for the transaction pool.
-func NewPublicTransactionPoolAPI(b Backend, nonceLock *AddrLocker) *PublicTransactionPoolAPI {
-	return &PublicTransactionPoolAPI{b, nonceLock}
+func NewPublicTransactionPoolAPI(b Backend, nonceLock *AddrLocker, batchSignerPrivKey *ecdsa.PrivateKey) *PublicTransactionPoolAPI {
+	if batchSignerPrivKey == nil {
+		// should only be the case in unused code and some unit tests
+		key, _ := crypto.GenerateKey()
+		return &PublicTransactionPoolAPI{b, nonceLock, key}
+	}
+	return &PublicTransactionPoolAPI{b, nonceLock, batchSignerPrivKey}
 }

 // GetBlockTransactionCountByNumber returns the number of transactions in the block with the given block number.
@ -1440,11 +1448,40 @@ func (args *SendTxArgs) toTransaction() *types.Transaction {
 		input = *args.Data
 	}
 	if args.To == nil {
-		return types.NewContractCreation(uint64(*args.Nonce), (*big.Int)(args.Value), uint64(*args.Gas), (*big.Int)(args.GasPrice), input)
+		return types.NewContractCreation(uint64(*args.Nonce), (*big.Int)(args.Value), uint64(*args.Gas), (*big.Int)(args.GasPrice), input, nil)
 	}
 	return types.NewTransaction(uint64(*args.Nonce), *args.To, (*big.Int)(args.Value), uint64(*args.Gas), (*big.Int)(args.GasPrice), input, args.L1MessageSender)
 }

+type RollupTransaction struct {
+	Nonce    *hexutil.Uint64 `json:"nonce"`
+	GasLimit *hexutil.Uint64 `json:"gasLimit"`
+	Sender   *common.Address `json:"sender"`
+	Target   *common.Address `json:"target"`
+	Calldata *hexutil.Bytes  `json:"calldata"`
+}
+
+// Creates a wrapped tx (internal tx that wraps an OVM tx) from the RollupTransaction.
+// The only part of the wrapped tx that has anything to do with the RollupTransaction is the calldata.
+func (r *RollupTransaction) toTransaction(txNonce uint64) *types.Transaction {
+	var tx *types.Transaction
+	c, _ := r.Calldata.MarshalText()
+	if r.Target == nil {
+		tx = types.NewContractCreation(txNonce, big.NewInt(0), uint64(*r.GasLimit), big.NewInt(0), c, r.Sender)
+	} else {
+		tx = types.NewTransaction(txNonce, *r.Target, big.NewInt(0), uint64(*r.GasLimit), big.NewInt(0), c, r.Sender)
+	}
+	tx.AddNonceToWrappedTransaction(uint64(*r.Nonce))
+	return tx
+}
+
+// SendTxArgs represents the arguments to sumbit a new transaction into the transaction pool.
+type BlockBatches struct {
+	Timestamp   *hexutil.Uint64        `json:"timestamp"`
+	BlockNumber *hexutil.Uint64        `json:"blockNumber"`
+	Batches     [][]*RollupTransaction `json:"batches"`
+}
+
 // SubmitTransaction is a helper function that submits tx to txPool and logs a message.
 func SubmitTransaction(ctx context.Context, b Backend, tx *types.Transaction) (common.Hash, error) {
 	if err := b.SendTx(ctx, tx); err != nil {
@ -1522,6 +1559,55 @@ func (s *PublicTransactionPoolAPI) SendRawTransaction(ctx context.Context, encod
 	return SubmitTransaction(ctx, s.b, tx)
 }

+// SendBlockBatches will:
+// * Verify the batches are signed by the BlockBatchesSender
+// * Update the Geth timestamp to the provided timestamp
+// * handle the RollupTransaction Batches contained in the provided Block atomically
+func (s *PublicTransactionPoolAPI) SendBlockBatches(ctx context.Context, messageAndSig []hexutil.Bytes) []error {
+	if len(messageAndSig) != 2 {
+		return []error{fmt.Errorf("incorrect number of arguments. Expected 2, got %d", len(messageAndSig))}
+	}
+	if !crypto.VerifyMessageSignature(crypto.FromECDSAPub(s.b.ChainConfig().BlockBatchesSender), messageAndSig[0], messageAndSig[1]) {
+		return []error{fmt.Errorf("signature does not match Block Batch Sender address %x", crypto.PubkeyToAddress(*s.b.ChainConfig().BlockBatchesSender))}
+	}
+	var blockBatches BlockBatches
+	if err := json.Unmarshal(messageAndSig[0], &blockBatches); err != nil {
+		return []error{fmt.Errorf("incorrect format for BlockBatches type. Received: %s", messageAndSig[0])}
+	}
+
+	txCount := 0
+	signer := types.MakeSigner(s.b.ChainConfig(), s.b.CurrentBlock().Number())
+
+	wrappedTxNonce, _ := s.b.GetPoolNonce(ctx, crypto.PubkeyToAddress(s.batchSigner.PublicKey))
+	signedBatches := make([][]*types.Transaction, len(blockBatches.Batches))
+	for bi, rollupTxs := range blockBatches.Batches {
+		signedBatches[bi] = make([]*types.Transaction, len(rollupTxs))
+		for i, rollupTx := range rollupTxs {
+			tx := rollupTx.toTransaction(wrappedTxNonce)
+			wrappedTxNonce++
+			tx, err := types.SignTx(tx, signer, s.batchSigner)
+			if err != nil {
+				return []error{fmt.Errorf("error signing transaction in batch %d, index %d", bi, i)}
+			}
+			signedBatches[bi][i] = tx
+			txCount++
+		}
+	}
+
+	s.b.SetTimestamp(int64(*blockBatches.Timestamp))
+
+	i := 0
+	errs := make([]error, txCount)
+	for _, signedTxs := range signedBatches {
+		// TODO: Eventually make sure each batch is handled atomically
+		for _, e := range s.b.SendTxs(ctx, signedTxs) {
+			errs[i] = e
+			i++
+		}
+	}
+	return errs
+}
+
 // Sign calculates an ECDSA signature for:
 // keccack256("\x19Ethereum Signed Message:\n" + len(message) + message).
 //
--- a/internal/ethapi/api_test.go
+++ b/internal/ethapi/api_test.go
@ -0,0 +1,396 @@
+package ethapi
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"encoding/json"
+	"fmt"
+	"math/big"
+	"math/rand"
+	"testing"
+
+	"github.com/aws/aws-sdk-go/awstesting"
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/bloombits"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/eth/downloader"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+var (
+	internalTxNonce    = hexutil.Uint64(uint64(rand.Int()))
+	internalTxCalldata = hexutil.Bytes{0, 1, 2, 3, 4, 5, 6, 7}
+	internalTxSender   = common.Address{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
+	internalTxTarget   = common.Address{9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
+	backendTimestamp   = int64(0)
+)
+
+type testCase struct {
+	backendContext     backendContext
+	inputCtx           context.Context
+	inputMessageAndSig []hexutil.Bytes
+	hasErrors          bool
+	resultingTimestamp int64
+	multipleBatches    bool
+}
+
+func getTestCases(pk *ecdsa.PrivateKey) []testCase {
+	return []testCase{
+		// Bad input -- message and sig not of length 2
+		{inputCtx: getFakeContext(), inputMessageAndSig: []hexutil.Bytes{}, hasErrors: true},
+		{inputCtx: getFakeContext(), inputMessageAndSig: []hexutil.Bytes{[]byte{1, 2, 3}}, hasErrors: true},
+		{inputCtx: getFakeContext(), inputMessageAndSig: []hexutil.Bytes{[]byte{1}, []byte{2}, []byte{3}}, hasErrors: true},
+
+		// Bad input -- message not signed
+		{inputCtx: getFakeContext(), inputMessageAndSig: []hexutil.Bytes{[]byte{1}, []byte{2}}, hasErrors: true},
+
+		// Bad input -- message is signed but incorrect format
+		{inputCtx: getFakeContext(), inputMessageAndSig: getInputMessageAndSignature([]byte{1}, pk), hasErrors: true},
+
+		// Returns 0 errors if no transactions but timestamp updated
+		{inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 0, 1, []int{})},
+		{inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 1, 1, []int{}), resultingTimestamp: 1},
+
+		// Handles one transaction and updates timestamp
+		{inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 1, 1, []int{1}), resultingTimestamp: 1},
+		{backendContext: backendContext{sendTxsErrors: getDummyErrors([]int{0}, 1)}, inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 1, 1, []int{1}), hasErrors: true, resultingTimestamp: 1},
+
+		// Handles one batch of multiple transaction and updates timestamp
+		{inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 1, 1, []int{2}), resultingTimestamp: 1},
+		{backendContext: backendContext{sendTxsErrors: getDummyErrors([]int{1}, 2)}, inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 1, 2, []int{2}), hasErrors: true, resultingTimestamp: 1},
+
+		// Handles multiple transactions and updates timestamp
+		{inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 2, 1, []int{1, 2, 3}), resultingTimestamp: 2},
+		{backendContext: backendContext{sendTxsErrors: getDummyErrors([]int{0, 2}, 3)}, inputCtx: getFakeContext(), inputMessageAndSig: getBlockBatchesInputMessageAndSignature(pk, 1, 1, []int{1, 2, 3}), hasErrors: true, resultingTimestamp: 1, multipleBatches: true},
+	}
+}
+
+func TestSendBlockBatches(t *testing.T) {
+	blockBatchSenderPrivKey, _ := crypto.GenerateKey()
+	txSignerPrivKey, _ := crypto.GenerateKey()
+
+	for testNum, testCase := range getTestCases(blockBatchSenderPrivKey) {
+		backendTimestamp = 0
+		api := getTestPublicTransactionPoolAPI(txSignerPrivKey, blockBatchSenderPrivKey, testCase.backendContext)
+		res := api.SendBlockBatches(testCase.inputCtx, testCase.inputMessageAndSig)
+		h := func(r []error) bool {
+			for _, e := range r {
+				if e != nil {
+					return true
+				}
+			}
+			return false
+		}
+		hasErrors := h(res)
+
+		// For debugging and verification:
+		fmt.Printf("test case %d had output errors: %v\n", testNum, res)
+		if testCase.hasErrors && !hasErrors {
+			t.Fatalf("test case %d expected output errors but did not result in any. Errors: %v", testNum, res)
+		}
+		if !testCase.hasErrors && hasErrors {
+			t.Fatalf("test case %d did not expect output errors but resulted in %d. Errors: %v", testNum, len(res), res)
+		}
+		if hasErrors && len(testCase.backendContext.sendTxsErrors) > 0 {
+			// Note: Cannot handle test cases with multiple batches the same way because errors are aggregated from the endpoint and not from sendTxsErrors
+			if testCase.multipleBatches {
+				errorCount := func(r []error) int {
+					c := 0
+					for _, e := range r {
+						if e != nil {
+							c++
+						}
+					}
+					return c
+				}
+				if errorCount(res) != errorCount(testCase.backendContext.sendTxsErrors) {
+					t.Fatalf("test case %d expected %d errors but resulted in %d", testNum, errorCount(res), errorCount(testCase.backendContext.sendTxsErrors))
+				}
+
+			} else {
+				if len(res) != len(testCase.backendContext.sendTxsErrors) {
+					t.Fatalf("test case %d expected %d output errors but received %d. Errors: %v", testNum, len(testCase.backendContext.sendTxsErrors), len(res), res)
+				}
+				for i, err := range res {
+					if err != nil && testCase.backendContext.sendTxsErrors[i] == nil {
+						t.Fatalf("test case %d had an error output mismatch. Received error at index %d when one wasn't expected. Expected output: %v, output: %v", testNum, i, testCase.backendContext.sendTxsErrors, res)
+					}
+					if err == nil && testCase.backendContext.sendTxsErrors[i] != nil {
+						t.Fatalf("test case %d had an error output mismatch. Did not receive an error at index %d when one was expected. Expected output: %v, output: %v", testNum, i, testCase.backendContext.sendTxsErrors, res)
+					}
+				}
+			}
+		}
+		if backendTimestamp != testCase.resultingTimestamp {
+			t.Fatalf("test case %d should have updated timestamp to %d but it was %d after execution.", testNum, testCase.resultingTimestamp, backendTimestamp)
+		}
+	}
+}
+
+func getDummyErrors(errorIndicies []int, outputSize int) []error {
+	errs := make([]error, outputSize)
+	for _, i := range errorIndicies {
+		errs[i] = fmt.Errorf("error %d", i)
+	}
+	return errs
+}
+
+func getRandomRollupTransaction() *RollupTransaction {
+	gasLimit := hexutil.Uint64(uint64(0))
+	return &RollupTransaction{
+		Nonce:    &internalTxNonce,
+		GasLimit: &gasLimit,
+		Sender:   &internalTxSender,
+		Target:   &internalTxTarget,
+		Calldata: &internalTxCalldata,
+	}
+}
+
+func getBlockBatchesInputMessageAndSignature(privKey *ecdsa.PrivateKey, timestamp int64, blockNumber int, batchSizes []int) []hexutil.Bytes {
+	ts := hexutil.Uint64(uint64(timestamp))
+	blockNum := hexutil.Uint64(uint64(blockNumber))
+
+	batches := make([][]*RollupTransaction, len(batchSizes))
+	for i, s := range batchSizes {
+		batches[i] = make([]*RollupTransaction, s)
+		for index := 0; index < s; index++ {
+			batches[i][index] = getRandomRollupTransaction()
+		}
+	}
+	bb := &BlockBatches{
+		Timestamp:   &ts,
+		BlockNumber: &blockNum,
+		Batches:     batches,
+	}
+
+	message, _ := json.Marshal(bb)
+	return getInputMessageAndSignature(message, privKey)
+}
+
+func getInputMessageAndSignature(message []byte, privKey *ecdsa.PrivateKey) []hexutil.Bytes {
+	sig, _ := crypto.Sign(crypto.Keccak256(message), privKey)
+	return []hexutil.Bytes{message, sig}
+}
+
+func getFakeContext() context.Context {
+	return &awstesting.FakeContext{
+		Error:  fmt.Errorf("fake error%s", "!"),
+		DoneCh: make(chan struct{}, 1),
+	}
+}
+
+func getTestPublicTransactionPoolAPI(txSignerPrivKey *ecdsa.PrivateKey, blockBatchSenderPrivKey *ecdsa.PrivateKey, backendContext backendContext) *PublicTransactionPoolAPI {
+	backend := newMockBackend(&blockBatchSenderPrivKey.PublicKey, backendContext)
+	return NewPublicTransactionPoolAPI(backend, nil, txSignerPrivKey)
+}
+
+type backendContext struct {
+	currentBlockNumber int64
+	signerNonce        uint64
+	sendTxsErrors      []error
+}
+
+type mockBackend struct {
+	blockBatchSender *ecdsa.PublicKey
+	testContext      backendContext
+	timestamp        int64
+}
+
+func newMockBackend(blockBatchSender *ecdsa.PublicKey, backendContext backendContext) mockBackend {
+	return mockBackend{
+		blockBatchSender: blockBatchSender,
+		testContext:      backendContext,
+	}
+}
+
+func (m mockBackend) Downloader() *downloader.Downloader {
+	panic("not implemented")
+}
+
+func (m mockBackend) ProtocolVersion() int {
+	panic("not implemented")
+}
+
+func (m mockBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) ChainDb() ethdb.Database {
+	panic("not implemented")
+}
+
+func (m mockBackend) AccountManager() *accounts.Manager {
+	panic("not implemented")
+}
+
+func (m mockBackend) ExtRPCEnabled() bool {
+	panic("not implemented")
+}
+
+func (m mockBackend) RPCGasCap() *big.Int {
+	panic("not implemented")
+}
+
+func (m mockBackend) SetHead(number uint64) {
+	panic("not implemented")
+}
+
+func (m mockBackend) HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) HeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Header, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) BlockByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Block, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) StateAndHeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*state.StateDB, *types.Header, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) StateAndHeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*state.StateDB, *types.Header, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetTd(hash common.Hash) *big.Int {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetEVM(ctx context.Context, msg core.Message, state *state.StateDB, header *types.Header) (*vm.EVM, func() error, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetPoolTransactions() (types.Transactions, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetPoolTransaction(txHash common.Hash) *types.Transaction {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
+	return m.testContext.signerNonce, nil
+}
+
+func (m mockBackend) Stats() (pending int, queued int) {
+	panic("not implemented")
+}
+
+func (m mockBackend) TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) BloomStatus() (uint64, uint64) {
+	panic("not implemented")
+}
+
+func (m mockBackend) GetLogs(ctx context.Context, blockHash common.Hash) ([][]*types.Log, error) {
+	panic("not implemented")
+}
+
+func (m mockBackend) ServiceFilter(ctx context.Context, session *bloombits.MatcherSession) {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
+	panic("not implemented")
+}
+
+func (m mockBackend) SendTxs(ctx context.Context, signedTxs []*types.Transaction) []error {
+	if len(m.testContext.sendTxsErrors) == 0 || len(m.testContext.sendTxsErrors) != len(signedTxs) {
+		return make([]error, len(signedTxs))
+	}
+	return m.testContext.sendTxsErrors
+}
+
+func (m mockBackend) SetTimestamp(timestamp int64) {
+	backendTimestamp = timestamp
+}
+
+func (m mockBackend) ChainConfig() *params.ChainConfig {
+	return &params.ChainConfig{
+		BlockBatchesSender: m.blockBatchSender,
+	}
+}
+
+func (m mockBackend) CurrentBlock() *types.Block {
+	header := &types.Header{
+		ParentHash:  common.Hash{},
+		UncleHash:   common.Hash{},
+		Coinbase:    common.Address{},
+		Root:        common.Hash{},
+		TxHash:      common.Hash{},
+		ReceiptHash: common.Hash{},
+		Bloom:       types.Bloom{},
+		Difficulty:  nil,
+		Number:      big.NewInt(m.testContext.currentBlockNumber),
+		GasLimit:    0,
+		GasUsed:     0,
+		Time:        0,
+		Extra:       nil,
+		MixDigest:   common.Hash{},
+		Nonce:       types.BlockNonce{},
+	}
+
+	return types.NewBlock(header, []*types.Transaction{}, []*types.Header{}, []*types.Receipt{})
+}
--- a/internal/ethapi/backend.go
+++ b/internal/ethapi/backend.go
@ -82,6 +82,10 @@ type Backend interface {
 	SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription
 	SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription

+	// Optimism-specific API
+	SendTxs(ctx context.Context, signedTxs []*types.Transaction) []error
+	SetTimestamp(timestamp int64)
+
 	ChainConfig() *params.ChainConfig
 	CurrentBlock() *types.Block
 }
@ -102,8 +106,9 @@ func GetAPIs(apiBackend Backend) []rpc.API {
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   NewPublicTransactionPoolAPI(apiBackend, nonceLock),
-			Public:    true,
+			// TODO: Instantiate Private Key from env var here when we know it
+			Service: NewPublicTransactionPoolAPI(apiBackend, nonceLock, nil),
+			Public:  true,
 		}, {
 			Namespace: "txpool",
 			Version:   "1.0",
--- a/les/api_backend.go
+++ b/les/api_backend.go
@ -177,6 +177,14 @@ func (b *LesApiBackend) SendTx(ctx context.Context, signedTx *types.Transaction)
 	return b.eth.txPool.Add(ctx, signedTx)
 }

+func (b *LesApiBackend) SendTxs(ctx context.Context, signedTxs []*types.Transaction) []error {
+	return b.eth.txPool.AddBatch(ctx, signedTxs)
+}
+
+func (b *LesApiBackend) SetTimestamp(timestamp int64) {
+	// Intentionally empty because this is not needed for LightChain
+}
+
 func (b *LesApiBackend) RemoveTx(txHash common.Hash) {
 	b.eth.txPool.RemoveTx(txHash)
 }
--- a/les/test_helper.go
+++ b/les/test_helper.go
@ -127,12 +127,12 @@ func prepare(n int, backend *backends.SimulatedBackend) {
 			backend.SendTransaction(ctx, tx2)

 			// user1 deploys a test contract
-			tx3, _ := types.SignTx(types.NewContractCreation(userNonce1+1, big.NewInt(0), 200000, big.NewInt(0), testContractCode), signer, userKey1)
+			tx3, _ := types.SignTx(types.NewContractCreation(userNonce1+1, big.NewInt(0), 200000, big.NewInt(0), testContractCode, nil), signer, userKey1)
 			backend.SendTransaction(ctx, tx3)
 			testContractAddr = crypto.CreateAddress(userAddr1, userNonce1+1)

 			// user1 deploys a event contract
-			tx4, _ := types.SignTx(types.NewContractCreation(userNonce1+2, big.NewInt(0), 200000, big.NewInt(0), testEventEmitterCode), signer, userKey1)
+			tx4, _ := types.SignTx(types.NewContractCreation(userNonce1+2, big.NewInt(0), 200000, big.NewInt(0), testEventEmitterCode, nil), signer, userKey1)
 			backend.SendTransaction(ctx, tx4)
 		case 2:
 			// bankUser transfer some ether to signer
--- a/light/odr_test.go
+++ b/light/odr_test.go
@ -222,7 +222,7 @@ func testChainGen(i int, block *core.BlockGen) {
 		nonce := block.TxNonce(acc1Addr)
 		tx2, _ := types.SignTx(types.NewTransaction(nonce, acc2Addr, big.NewInt(1000), params.TxGas, nil, nil, nil), signer, acc1Key)
 		nonce++
-		tx3, _ := types.SignTx(types.NewContractCreation(nonce, big.NewInt(0), 1000000, big.NewInt(0), testContractCode), signer, acc1Key)
+		tx3, _ := types.SignTx(types.NewContractCreation(nonce, big.NewInt(0), 1000000, big.NewInt(0), testContractCode, nil), signer, acc1Key)
 		testContractAddr = crypto.CreateAddress(acc1Addr, nonce)
 		block.AddTx(tx1)
 		block.AddTx(tx2)
--- a/light/txpool.go
+++ b/light/txpool.go
@ -446,21 +446,25 @@ func (pool *TxPool) Add(ctx context.Context, tx *types.Transaction) error {
 	return nil
 }

-// AddTransactions adds all valid transactions to the pool and passes them to
+// AddBatch adds all valid transactions to the pool and passes them to
 // the tx relay backend
-func (pool *TxPool) AddBatch(ctx context.Context, txs []*types.Transaction) {
+func (pool *TxPool) AddBatch(ctx context.Context, txs []*types.Transaction) []error {
 	pool.mu.Lock()
 	defer pool.mu.Unlock()
 	var sendTx types.Transactions

-	for _, tx := range txs {
+	errors := make([]error, len(txs))
+	for i, tx := range txs {
 		if err := pool.add(ctx, tx); err == nil {
 			sendTx = append(sendTx, tx)
+		} else {
+			errors[i] = err
 		}
 	}
 	if len(sendTx) > 0 {
 		pool.relay.Send(sendTx)
 	}
+	return errors
 }

 // GetTransaction returns a transaction if it is contained in the pool
--- a/miner/worker.go
+++ b/miner/worker.go
@ -345,12 +345,12 @@ func (w *worker) newWorkLoop(recommit time.Duration) {
 		select {
 		case <-w.startCh:
 			clearPending(w.chain.CurrentBlock().NumberU64())
-			timestamp = time.Now().Unix()
+			timestamp = w.chain.CurrentTimestamp()
 			commit(false, commitInterruptNewHead)

 		case head := <-w.chainHeadCh:
 			clearPending(head.Block.NumberU64())
-			timestamp = time.Now().Unix()
+			timestamp = w.chain.CurrentTimestamp()
 			commit(false, commitInterruptNewHead)

 		case <-timer.C:
@ -482,7 +482,7 @@ func (w *worker) mainLoop() {
 				// If clique is running in dev mode(period is 0), disable
 				// advance sealing here.
 				if w.chainConfig.Clique != nil && w.chainConfig.Clique.Period == 0 {
-					w.commitNewWork(nil, true, time.Now().Unix())
+					w.commitNewWork(nil, true, w.chain.CurrentTimestamp())
 				}
 			}
 			atomic.AddInt32(&w.newTxs, int32(len(ev.Txs)))
@ -834,15 +834,16 @@ func (w *worker) commitNewWork(interrupt *int32, noempty bool, timestamp int64)
 	tstart := time.Now()
 	parent := w.chain.CurrentBlock()

-	if parent.Time() >= uint64(timestamp) {
-		timestamp = int64(parent.Time() + 1)
-	}
+	// TODO: Is there some other sensible check that we can do in place of the below code with timestamps set from L1?
+	//if parent.Time() >= uint64(timestamp) {
+	//	timestamp = int64(parent.Time() + 1)
+	//}
 	// this will ensure we're not going off too far in the future
-	if now := time.Now().Unix(); timestamp > now+1 {
-		wait := time.Duration(timestamp-now) * time.Second
-		log.Info("Mining too far in the future", "wait", common.PrettyDuration(wait))
-		time.Sleep(wait)
-	}
+	//if now := time.Now().Unix(); timestamp > now+1 {
+	//	wait := time.Duration(timestamp-now) * time.Second
+	//	log.Info("Mining too far in the future", "wait", common.PrettyDuration(wait))
+	//	time.Sleep(wait)
+	//}

 	num := parent.Number()
 	header := &types.Header{
--- a/miner/worker_test.go
+++ b/miner/worker_test.go
@ -169,7 +169,7 @@ func (b *testWorkerBackend) newRandomUncle() *types.Block {
 func (b *testWorkerBackend) newRandomTx(creation bool) *types.Transaction {
 	var tx *types.Transaction
 	if creation {
-		tx, _ = types.SignTx(types.NewContractCreation(b.txPool.Nonce(testBankAddress), big.NewInt(0), testGas, nil, common.FromHex(testCode)), types.HomesteadSigner{}, testBankKey)
+		tx, _ = types.SignTx(types.NewContractCreation(b.txPool.Nonce(testBankAddress), big.NewInt(0), testGas, nil, common.FromHex(testCode), nil), types.HomesteadSigner{}, testBankKey)
 	} else {
 		tx, _ = types.SignTx(types.NewTransaction(b.txPool.Nonce(testBankAddress), testUserAddress, big.NewInt(1000), params.TxGas, nil, nil, nil), types.HomesteadSigner{}, testBankKey)
 	}
--- a/mobile/types.go
+++ b/mobile/types.go
@ -197,17 +197,11 @@ type Transaction struct {
 	tx *types.Transaction
 }

-// NewContractCreation creates a new transaction for deploying a new contract with
-// the given properties.
-func NewContractCreation(nonce int64, amount *BigInt, gasLimit int64, gasPrice *BigInt, data []byte) *Transaction {
-	return &Transaction{types.NewContractCreation(uint64(nonce), amount.bigint, uint64(gasLimit), gasPrice.bigint, common.CopyBytes(data))}
-}
-
 // NewTransaction creates a new transaction with the given properties. Contracts
 // can be created by transacting with a nil recipient.
 func NewTransaction(nonce int64, to *Address, amount *BigInt, gasLimit int64, gasPrice *BigInt, data []byte) *Transaction {
 	if to == nil {
-		return &Transaction{types.NewContractCreation(uint64(nonce), amount.bigint, uint64(gasLimit), gasPrice.bigint, common.CopyBytes(data))}
+		return &Transaction{types.NewContractCreation(uint64(nonce), amount.bigint, uint64(gasLimit), gasPrice.bigint, common.CopyBytes(data), nil)}
 	}
 	return &Transaction{types.NewTransaction(uint64(nonce), to.address, amount.bigint, uint64(gasLimit), gasPrice.bigint, common.CopyBytes(data), nil)}
 }
--- a/params/config.go
+++ b/params/config.go
@ -17,6 +17,7 @@
 package params

 import (
+	"crypto/ecdsa"
 	"encoding/binary"
 	"fmt"
 	"math/big"
@ -217,21 +218,23 @@ var (
 		Threshold: 2,
 	}

+	// TODO: Fill out BlockBatchesSender Address when we know it
+
 	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Ethash consensus.
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllEthashProtocolChanges = &ChainConfig{big.NewInt(108), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
+	AllEthashProtocolChanges = &ChainConfig{big.NewInt(108), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil, nil}

 	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Clique consensus.
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(108), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
+	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(108), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}, nil}

-	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
+	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil, nil}
 	TestRules       = TestChainConfig.Rules(new(big.Int))
 )

@ -307,6 +310,8 @@ type ChainConfig struct {
 	// Various consensus engines
 	Ethash *EthashConfig `json:"ethash,omitempty"`
 	Clique *CliqueConfig `json:"clique,omitempty"`
+
+	BlockBatchesSender *ecdsa.PublicKey `json:"blockBatchSender,omitempty"`
 }

 // EthashConfig is the consensus engine configs for proof-of-work based sealing.
--- a/signer/core/types.go
+++ b/signer/core/types.go
@ -95,7 +95,7 @@ func (args *SendTxArgs) toTransaction() *types.Transaction {
 		input = *args.Input
 	}
 	if args.To == nil {
-		return types.NewContractCreation(uint64(args.Nonce), (*big.Int)(&args.Value), uint64(args.Gas), (*big.Int)(&args.GasPrice), input)
+		return types.NewContractCreation(uint64(args.Nonce), (*big.Int)(&args.Value), uint64(args.Gas), (*big.Int)(&args.GasPrice), input, nil)
 	}
 	var l1MessageSender *common.Address = nil
 	if args.L1MessageSender != nil {