Add sequencer role to oracle (#2810)

* bedrock: Add sequencer role to output oracle * bedrock: Test oracle access controls. * chore(bedrock): bindings, snapshot, changeset * bedrock: update oracle storage snapshot * bedrock: deploy scripts with oracle owner * test(bedrock): fix warp function in oracle test * bedrock: Address review feedback * bedrock: Generate unique deployer key in tests * kick build Co-authored-by: Matthew Slipper <me@matthewslipper.com>

Add sequencer role to oracle (#2810)
* bedrock: Add sequencer role to output oracle * bedrock: Test oracle access controls. * chore(bedrock): bindings, snapshot, changeset * bedrock: update oracle storage snapshot * bedrock: deploy scripts with oracle owner * test(bedrock): fix warp function in oracle test * bedrock: Address review feedback * bedrock: Generate unique deployer key in tests * kick build Co-authored-by: Matthew Slipper <me@matthewslipper.com>
a828da9f · Maurelian · GitHub · 5c5d92d4 · a828da9f · a828da9f
Commit a828da9f authored Jun 22, 2022 by Maurelian Committed by GitHub Jun 22, 2022
14 changed files
--- a/.changeset/curvy-coins-push.md
+++ b/.changeset/curvy-coins-push.md
+---
+'@eth-optimism/contracts-bedrock': patch
+---
+
+Separate the owner and sequencer roles in the OutputOracle
--- a/.changeset/famous-sloths-confess.md
+++ b/.changeset/famous-sloths-confess.md
+---
+'@eth-optimism/contracts-bedrock': minor
+---
+
+Add separate sequencer role to Oracle
--- a/op-bindings/bindings/l2outputoracle.go
+++ b/op-bindings/bindings/l2outputoracle.go
@@ -36,8 +36,8 @@ type L2OutputOracleOutputProposal struct {

 // L2OutputOracleMetaData contains all meta data concerning the L2OutputOracle contract.
 var L2OutputOracleMetaData = &bind.MetaData{
-	ABI: "[{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_submissionInterval\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_genesisL2Output\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_historicalTotalBlocks\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_startingBlockNumber\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_startingTimestamp\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_l2BlockTime\",\"type\":\"uint256\"},{\"internalType\":\"address\",\"name\":\"_sequencer\",\"type\":\"address\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_l2Output\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l1Timestamp\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"L2OutputAppended\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_l2Output\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l1Timestamp\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"L2OutputDeleted\",\"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\":\"HISTORICAL_TOTAL_BLOCKS\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"L2_BLOCK_TIME\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"STARTING_BLOCK_NUMBER\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"STARTING_TIMESTAMP\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"SUBMISSION_INTERVAL\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_l2Output\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_l1Blockhash\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_l1BlockNumber\",\"type\":\"uint256\"}],\"name\":\"appendL2Output\",\"outputs\":[],\"stateMutability\":\"payable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"computeL2Timestamp\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"components\":[{\"internalType\":\"bytes32\",\"name\":\"outputRoot\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"internalType\":\"structL2OutputOracle.OutputProposal\",\"name\":\"_proposal\",\"type\":\"tuple\"}],\"name\":\"deleteL2Output\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"getL2Output\",\"outputs\":[{\"components\":[{\"internalType\":\"bytes32\",\"name\":\"outputRoot\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"internalType\":\"structL2OutputOracle.OutputProposal\",\"name\":\"\",\"type\":\"tuple\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"latestBlockNumber\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"nextBlockNumber\",\"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\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]",
-	Bin: 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+	ABI: "[{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_submissionInterval\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_genesisL2Output\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_historicalTotalBlocks\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_startingBlockNumber\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_startingTimestamp\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_l2BlockTime\",\"type\":\"uint256\"},{\"internalType\":\"address\",\"name\":\"_sequencer\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_owner\",\"type\":\"address\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_l2Output\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l1Timestamp\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"L2OutputAppended\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"_l2Output\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l1Timestamp\",\"type\":\"uint256\"},{\"indexed\":true,\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"L2OutputDeleted\",\"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\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"previousSequencer\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newSequencer\",\"type\":\"address\"}],\"name\":\"SequencerChanged\",\"type\":\"event\"},{\"inputs\":[],\"name\":\"HISTORICAL_TOTAL_BLOCKS\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"L2_BLOCK_TIME\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"STARTING_BLOCK_NUMBER\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"STARTING_TIMESTAMP\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"SUBMISSION_INTERVAL\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_l2Output\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"},{\"internalType\":\"bytes32\",\"name\":\"_l1Blockhash\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"_l1BlockNumber\",\"type\":\"uint256\"}],\"name\":\"appendL2Output\",\"outputs\":[],\"stateMutability\":\"payable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newSequencer\",\"type\":\"address\"}],\"name\":\"changeSequencer\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"computeL2Timestamp\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"components\":[{\"internalType\":\"bytes32\",\"name\":\"outputRoot\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"internalType\":\"structL2OutputOracle.OutputProposal\",\"name\":\"_proposal\",\"type\":\"tuple\"}],\"name\":\"deleteL2Output\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_l2BlockNumber\",\"type\":\"uint256\"}],\"name\":\"getL2Output\",\"outputs\":[{\"components\":[{\"internalType\":\"bytes32\",\"name\":\"outputRoot\",\"type\":\"bytes32\"},{\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"internalType\":\"structL2OutputOracle.OutputProposal\",\"name\":\"\",\"type\":\"tuple\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"latestBlockNumber\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"nextBlockNumber\",\"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\":\"sequencer\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]",
+	Bin: 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 }

 // L2OutputOracleABI is the input ABI used to generate the binding from.
@@ -49,7 +49,7 @@ var L2OutputOracleABI = L2OutputOracleMetaData.ABI
 var L2OutputOracleBin = L2OutputOracleMetaData.Bin

 // DeployL2OutputOracle deploys a new Ethereum contract, binding an instance of L2OutputOracle to it.
-func DeployL2OutputOracle(auth *bind.TransactOpts, backend bind.ContractBackend, _submissionInterval *big.Int, _genesisL2Output [32]byte, _historicalTotalBlocks *big.Int, _startingBlockNumber *big.Int, _startingTimestamp *big.Int, _l2BlockTime *big.Int, _sequencer common.Address) (common.Address, *types.Transaction, *L2OutputOracle, error) {
+func DeployL2OutputOracle(auth *bind.TransactOpts, backend bind.ContractBackend, _submissionInterval *big.Int, _genesisL2Output [32]byte, _historicalTotalBlocks *big.Int, _startingBlockNumber *big.Int, _startingTimestamp *big.Int, _l2BlockTime *big.Int, _sequencer common.Address, _owner common.Address) (common.Address, *types.Transaction, *L2OutputOracle, error) {
 	parsed, err := L2OutputOracleMetaData.GetAbi()
 	if err != nil {
 		return common.Address{}, nil, nil, err
@@ -58,7 +58,7 @@ func DeployL2OutputOracle(auth *bind.TransactOpts, backend bind.ContractBackend,
 		return common.Address{}, nil, nil, errors.New("GetABI returned nil")
 	}

-	address, tx, contract, err := bind.DeployContract(auth, *parsed, common.FromHex(L2OutputOracleBin), backend, _submissionInterval, _genesisL2Output, _historicalTotalBlocks, _startingBlockNumber, _startingTimestamp, _l2BlockTime, _sequencer)
+	address, tx, contract, err := bind.DeployContract(auth, *parsed, common.FromHex(L2OutputOracleBin), backend, _submissionInterval, _genesisL2Output, _historicalTotalBlocks, _startingBlockNumber, _startingTimestamp, _l2BlockTime, _sequencer, _owner)
 	if err != nil {
 		return common.Address{}, nil, nil, err
 	}
@@ -517,6 +517,37 @@ func (_L2OutputOracle *L2OutputOracleCallerSession) Owner() (common.Address, err
 	return _L2OutputOracle.Contract.Owner(&_L2OutputOracle.CallOpts)
 }

+// Sequencer is a free data retrieval call binding the contract method 0x5c1bba38.
+//
+// Solidity: function sequencer() view returns(address)
+func (_L2OutputOracle *L2OutputOracleCaller) Sequencer(opts *bind.CallOpts) (common.Address, error) {
+	var out []interface{}
+	err := _L2OutputOracle.contract.Call(opts, &out, "sequencer")
+
+	if err != nil {
+		return *new(common.Address), err
+	}
+
+	out0 := *abi.ConvertType(out[0], new(common.Address)).(*common.Address)
+
+	return out0, err
+
+}
+
+// Sequencer is a free data retrieval call binding the contract method 0x5c1bba38.
+//
+// Solidity: function sequencer() view returns(address)
+func (_L2OutputOracle *L2OutputOracleSession) Sequencer() (common.Address, error) {
+	return _L2OutputOracle.Contract.Sequencer(&_L2OutputOracle.CallOpts)
+}
+
+// Sequencer is a free data retrieval call binding the contract method 0x5c1bba38.
+//
+// Solidity: function sequencer() view returns(address)
+func (_L2OutputOracle *L2OutputOracleCallerSession) Sequencer() (common.Address, error) {
+	return _L2OutputOracle.Contract.Sequencer(&_L2OutputOracle.CallOpts)
+}
+
 // AppendL2Output is a paid mutator transaction binding the contract method 0x25188104.
 //
 // Solidity: function appendL2Output(bytes32 _l2Output, uint256 _l2BlockNumber, bytes32 _l1Blockhash, uint256 _l1BlockNumber) payable returns()
@@ -538,6 +569,27 @@ func (_L2OutputOracle *L2OutputOracleTransactorSession) AppendL2Output(_l2Output
 	return _L2OutputOracle.Contract.AppendL2Output(&_L2OutputOracle.TransactOpts, _l2Output, _l2BlockNumber, _l1Blockhash, _l1BlockNumber)
 }

+// ChangeSequencer is a paid mutator transaction binding the contract method 0x2af8ded8.
+//
+// Solidity: function changeSequencer(address _newSequencer) returns()
+func (_L2OutputOracle *L2OutputOracleTransactor) ChangeSequencer(opts *bind.TransactOpts, _newSequencer common.Address) (*types.Transaction, error) {
+	return _L2OutputOracle.contract.Transact(opts, "changeSequencer", _newSequencer)
+}
+
+// ChangeSequencer is a paid mutator transaction binding the contract method 0x2af8ded8.
+//
+// Solidity: function changeSequencer(address _newSequencer) returns()
+func (_L2OutputOracle *L2OutputOracleSession) ChangeSequencer(_newSequencer common.Address) (*types.Transaction, error) {
+	return _L2OutputOracle.Contract.ChangeSequencer(&_L2OutputOracle.TransactOpts, _newSequencer)
+}
+
+// ChangeSequencer is a paid mutator transaction binding the contract method 0x2af8ded8.
+//
+// Solidity: function changeSequencer(address _newSequencer) returns()
+func (_L2OutputOracle *L2OutputOracleTransactorSession) ChangeSequencer(_newSequencer common.Address) (*types.Transaction, error) {
+	return _L2OutputOracle.Contract.ChangeSequencer(&_L2OutputOracle.TransactOpts, _newSequencer)
+}
+
 // DeleteL2Output is a paid mutator transaction binding the contract method 0x093b3d90.
 //
 // Solidity: function deleteL2Output((bytes32,uint256) _proposal) returns()
@@ -1077,3 +1129,156 @@ func (_L2OutputOracle *L2OutputOracleFilterer) ParseOwnershipTransferred(log typ
 	event.Raw = log
 	return event, nil
 }
+
+// L2OutputOracleSequencerChangedIterator is returned from FilterSequencerChanged and is used to iterate over the raw logs and unpacked data for SequencerChanged events raised by the L2OutputOracle contract.
+type L2OutputOracleSequencerChangedIterator struct {
+	Event *L2OutputOracleSequencerChanged // Event containing the contract specifics and raw log
+
+	contract *bind.BoundContract // Generic contract to use for unpacking event data
+	event    string              // Event name to use for unpacking event data
+
+	logs chan types.Log        // Log channel receiving the found contract events
+	sub  ethereum.Subscription // Subscription for errors, completion and termination
+	done bool                  // Whether the subscription completed delivering logs
+	fail error                 // Occurred error to stop iteration
+}
+
+// Next advances the iterator to the subsequent event, returning whether there
+// are any more events found. In case of a retrieval or parsing error, false is
+// returned and Error() can be queried for the exact failure.
+func (it *L2OutputOracleSequencerChangedIterator) Next() bool {
+	// If the iterator failed, stop iterating
+	if it.fail != nil {
+		return false
+	}
+	// If the iterator completed, deliver directly whatever's available
+	if it.done {
+		select {
+		case log := <-it.logs:
+			it.Event = new(L2OutputOracleSequencerChanged)
+			if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil {
+				it.fail = err
+				return false
+			}
+			it.Event.Raw = log
+			return true
+
+		default:
+			return false
+		}
+	}
+	// Iterator still in progress, wait for either a data or an error event
+	select {
+	case log := <-it.logs:
+		it.Event = new(L2OutputOracleSequencerChanged)
+		if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil {
+			it.fail = err
+			return false
+		}
+		it.Event.Raw = log
+		return true
+
+	case err := <-it.sub.Err():
+		it.done = true
+		it.fail = err
+		return it.Next()
+	}
+}
+
+// Error returns any retrieval or parsing error occurred during filtering.
+func (it *L2OutputOracleSequencerChangedIterator) Error() error {
+	return it.fail
+}
+
+// Close terminates the iteration process, releasing any pending underlying
+// resources.
+func (it *L2OutputOracleSequencerChangedIterator) Close() error {
+	it.sub.Unsubscribe()
+	return nil
+}
+
+// L2OutputOracleSequencerChanged represents a SequencerChanged event raised by the L2OutputOracle contract.
+type L2OutputOracleSequencerChanged struct {
+	PreviousSequencer common.Address
+	NewSequencer      common.Address
+	Raw               types.Log // Blockchain specific contextual infos
+}
+
+// FilterSequencerChanged is a free log retrieval operation binding the contract event 0x6ec88bae255aa7e73521c3beb17e9bc7940169e669440c5531733c0d2e91110d.
+//
+// Solidity: event SequencerChanged(address indexed previousSequencer, address indexed newSequencer)
+func (_L2OutputOracle *L2OutputOracleFilterer) FilterSequencerChanged(opts *bind.FilterOpts, previousSequencer []common.Address, newSequencer []common.Address) (*L2OutputOracleSequencerChangedIterator, error) {
+
+	var previousSequencerRule []interface{}
+	for _, previousSequencerItem := range previousSequencer {
+		previousSequencerRule = append(previousSequencerRule, previousSequencerItem)
+	}
+	var newSequencerRule []interface{}
+	for _, newSequencerItem := range newSequencer {
+		newSequencerRule = append(newSequencerRule, newSequencerItem)
+	}
+
+	logs, sub, err := _L2OutputOracle.contract.FilterLogs(opts, "SequencerChanged", previousSequencerRule, newSequencerRule)
+	if err != nil {
+		return nil, err
+	}
+	return &L2OutputOracleSequencerChangedIterator{contract: _L2OutputOracle.contract, event: "SequencerChanged", logs: logs, sub: sub}, nil
+}
+
+// WatchSequencerChanged is a free log subscription operation binding the contract event 0x6ec88bae255aa7e73521c3beb17e9bc7940169e669440c5531733c0d2e91110d.
+//
+// Solidity: event SequencerChanged(address indexed previousSequencer, address indexed newSequencer)
+func (_L2OutputOracle *L2OutputOracleFilterer) WatchSequencerChanged(opts *bind.WatchOpts, sink chan<- *L2OutputOracleSequencerChanged, previousSequencer []common.Address, newSequencer []common.Address) (event.Subscription, error) {
+
+	var previousSequencerRule []interface{}
+	for _, previousSequencerItem := range previousSequencer {
+		previousSequencerRule = append(previousSequencerRule, previousSequencerItem)
+	}
+	var newSequencerRule []interface{}
+	for _, newSequencerItem := range newSequencer {
+		newSequencerRule = append(newSequencerRule, newSequencerItem)
+	}
+
+	logs, sub, err := _L2OutputOracle.contract.WatchLogs(opts, "SequencerChanged", previousSequencerRule, newSequencerRule)
+	if err != nil {
+		return nil, err
+	}
+	return event.NewSubscription(func(quit <-chan struct{}) error {
+		defer sub.Unsubscribe()
+		for {
+			select {
+			case log := <-logs:
+				// New log arrived, parse the event and forward to the user
+				event := new(L2OutputOracleSequencerChanged)
+				if err := _L2OutputOracle.contract.UnpackLog(event, "SequencerChanged", log); err != nil {
+					return err
+				}
+				event.Raw = log
+
+				select {
+				case sink <- event:
+				case err := <-sub.Err():
+					return err
+				case <-quit:
+					return nil
+				}
+			case err := <-sub.Err():
+				return err
+			case <-quit:
+				return nil
+			}
+		}
+	}), nil
+}
+
+// ParseSequencerChanged is a log parse operation binding the contract event 0x6ec88bae255aa7e73521c3beb17e9bc7940169e669440c5531733c0d2e91110d.
+//
+// Solidity: event SequencerChanged(address indexed previousSequencer, address indexed newSequencer)
+func (_L2OutputOracle *L2OutputOracleFilterer) ParseSequencerChanged(log types.Log) (*L2OutputOracleSequencerChanged, error) {
+	event := new(L2OutputOracleSequencerChanged)
+	if err := _L2OutputOracle.contract.UnpackLog(event, "SequencerChanged", log); err != nil {
+		return nil, err
+	}
+	event.Raw = log
+	return event, nil
+}
--- a/op-e2e/setup.go
+++ b/op-e2e/setup.go
@@ -402,7 +402,7 @@ func (cfg SystemConfig) start() (*System, error) {
 	// Deploy Deposit Contract
 	deployerPrivKey, err := sys.wallet.PrivateKey(accounts.Account{
 		URL: accounts.URL{
-			Path: sys.cfg.DeployerHDPath,
+			Path: cfg.DeployerHDPath,
 		},
 	})
 	if err != nil {
@@ -425,6 +425,7 @@ func (cfg SystemConfig) start() (*System, error) {
 		sys.cfg.L2OOCfg.L2StartingTimeStamp,
 		sys.cfg.L2OOCfg.L2BlockTime,
 		l2OutputSubmitterAddr,
+		crypto.PubkeyToAddress(deployerPrivKey.PublicKey),
 	)
 	sys.cfg.DepositCFG.L2Oracle = sys.L2OOContractAddr
 	if err != nil {

--- a/op-e2e/system_test.go
+++ b/op-e2e/system_test.go
@@ -57,6 +57,7 @@ const (
 	l2OutputHDPath     = "m/44'/60'/0'/0/3"
 	bssHDPath          = "m/44'/60'/0'/0/4"
 	p2pSignerHDPath    = "m/44'/60'/0'/0/5"
+	deployerHDPath     = "m/44'/60'/0'/0/6"
 )

 var (
@@ -81,6 +82,7 @@ func defaultSystemConfig(t *testing.T) SystemConfig {
 			transactorHDPath:   10000000,
 			l2OutputHDPath:     10000000,
 			bssHDPath:          10000000,
+			deployerHDPath:     10000000,
 		},
 		DepositCFG: DepositContractConfig{
 			FinalizationPeriod: big.NewInt(60 * 60 * 24),
@@ -94,7 +96,7 @@ func defaultSystemConfig(t *testing.T) SystemConfig {
 		L2OutputHDPath:             l2OutputHDPath,
 		BatchSubmitterHDPath:       bssHDPath,
 		P2PSignerHDPath:            p2pSignerHDPath,
-		DeployerHDPath:             l2OutputHDPath,
+		DeployerHDPath:             deployerHDPath,
 		CliqueSignerDerivationPath: cliqueSignerHDPath,
 		L1InfoPredeployAddress:     predeploys.L1BlockAddr,
 		L1BlockTime:                2,

--- a/packages/contracts-bedrock/.gas-snapshot
+++ b/packages/contracts-bedrock/.gas-snapshot
@@ -39,7 +39,7 @@ L1StandardBridge_Test:test_depositERC20() (gas: 452856)
 L1StandardBridge_Test:test_depositERC20To() (gas: 454632)
 L1StandardBridge_Test:test_depositETH() (gas: 247077)
 L1StandardBridge_Test:test_depositETHTo() (gas: 204961)
-L1StandardBridge_Test:test_finalizeERC20Withdrawal() (gas: 438752)
+L1StandardBridge_Test:test_finalizeERC20Withdrawal() (gas: 438745)
 L1StandardBridge_Test:test_finalizeETHWithdrawal() (gas: 48005)
 L1StandardBridge_Test:test_initialize() (gas: 14885)
 L1StandardBridge_Test:test_onlyEOADepositERC20() (gas: 12085)
@@ -57,21 +57,24 @@ L2CrossDomainMessenger_Test:test_L2MessengerSendMessage() (gas: 119682)
 L2CrossDomainMessenger_Test:test_L2MessengerTwiceSendMessage() (gas: 133142)
 L2CrossDomainMessenger_Test:test_L2MessengerXDomainSenderReverts() (gas: 10599)
 L2CrossDomainMessenger_Test:test_L2MessengerxDomainMessageSenderResets() (gas: 54881)
-L2OutputOracleTest:testCannot_appendEmptyOutput() (gas: 18442)
-L2OutputOracleTest:testCannot_appendFutureTimetamp() (gas: 20072)
-L2OutputOracleTest:testCannot_appendOnWrongFork() (gas: 20710)
-L2OutputOracleTest:testCannot_appendOutputIfNotSequencer() (gas: 17829)
-L2OutputOracleTest:testCannot_appendUnexpectedBlockNumber() (gas: 20313)
-L2OutputOracleTest:testCannot_deleteL2Output_ifNotSequencer() (gas: 18805)
-L2OutputOracleTest:testCannot_deleteWrongL2Output() (gas: 79498)
-L2OutputOracleTest:test_appendWithBlockhashAndHeight() (gas: 69365)
-L2OutputOracleTest:test_appendingAnotherOutput() (gas: 70714)
-L2OutputOracleTest:test_computeL2Timestamp() (gas: 19230)
-L2OutputOracleTest:test_constructor() (gas: 33908)
-L2OutputOracleTest:test_deleteL2Output() (gas: 66081)
-L2OutputOracleTest:test_getL2Output() (gas: 76274)
-L2OutputOracleTest:test_latestBlockNumber() (gas: 70075)
-L2OutputOracleTest:test_nextBlockNumber() (gas: 9279)
+L2OutputOracleTest:testCannot_appendEmptyOutput() (gas: 18193)
+L2OutputOracleTest:testCannot_appendFutureTimetamp() (gas: 20160)
+L2OutputOracleTest:testCannot_appendOnWrongFork() (gas: 20439)
+L2OutputOracleTest:testCannot_appendOutputIfNotSequencer() (gas: 17584)
+L2OutputOracleTest:testCannot_appendUnexpectedBlockNumber() (gas: 20063)
+L2OutputOracleTest:testCannot_deleteL2Output_ifNotOwner() (gas: 18870)
+L2OutputOracleTest:testCannot_deleteL2Output_withWrongRoot() (gas: 83284)
+L2OutputOracleTest:testCannot_deleteL2Output_withWrongTime() (gas: 79277)
+L2OutputOracleTest:test_appendWithBlockhashAndHeight() (gas: 69103)
+L2OutputOracleTest:test_appendingAnotherOutput() (gas: 70429)
+L2OutputOracleTest:test_changeSequencer() (gas: 35175)
+L2OutputOracleTest:test_computeL2Timestamp() (gas: 19231)
+L2OutputOracleTest:test_constructor() (gas: 40084)
+L2OutputOracleTest:test_deleteL2Output() (gas: 69164)
+L2OutputOracleTest:test_getL2Output() (gas: 76076)
+L2OutputOracleTest:test_latestBlockNumber() (gas: 69832)
+L2OutputOracleTest:test_nextBlockNumber() (gas: 9280)
+L2OutputOracleTest:test_updateOwner() (gas: 24112)
 L2StandardBridge_Test:test_ERC20BridgeFailed_whenLocalTokenIsBridge() (gas: 133097)
 L2StandardBridge_Test:test_cannotWithdrawEthWithoutSendingIt() (gas: 21611)
 L2StandardBridge_Test:test_finalizeDeposit() (gas: 93100)
@@ -110,7 +113,7 @@ OptimismMintableTokenFactory_Test:test_initializeShouldRevert() (gas: 12696)
 OptimismPortal_Test:test_OptimismPortalConstructor() (gas: 11413)
 OptimismPortal_Test:test_OptimismPortalContractCreationReverts() (gas: 9214)
 OptimismPortal_Test:test_OptimismPortalReceiveEth() (gas: 121706)
-OptimismPortal_Test:test_cannotVerifyRecentWithdrawal() (gas: 21886)
+OptimismPortal_Test:test_cannotVerifyRecentWithdrawal() (gas: 21908)
 OptimismPortal_Test:test_depositTransaction_NoValueContract() (gas: 70746)
 OptimismPortal_Test:test_depositTransaction_NoValueEOA() (gas: 71114)
 OptimismPortal_Test:test_depositTransaction_createWithZeroValueForContract() (gas: 70773)
@@ -119,7 +122,7 @@ OptimismPortal_Test:test_depositTransaction_withEthValueAndContractContractCreat
 OptimismPortal_Test:test_depositTransaction_withEthValueAndEOAContractCreation() (gas: 69947)
 OptimismPortal_Test:test_depositTransaction_withEthValueFromContract() (gas: 77478)
 OptimismPortal_Test:test_depositTransaction_withEthValueFromEOA() (gas: 78049)
-OptimismPortal_Test:test_invalidWithdrawalProof() (gas: 33702)
+OptimismPortal_Test:test_invalidWithdrawalProof() (gas: 33746)
 Proxy_Test:test_clashingFunctionSignatures() (gas: 101427)
 Proxy_Test:test_implementationKey() (gas: 20942)
 Proxy_Test:test_implementationProxyCallIfNotAdmin() (gas: 30021)

--- a/packages/contracts-bedrock/.storage-layout
+++ b/packages/contracts-bedrock/.storage-layout
@@ -69,9 +69,11 @@
 +======================================================================================================+
 | _owner            | address                                                  | 0    | 0      | 20    |
 |-------------------+----------------------------------------------------------+------+--------+-------|
-| latestBlockNumber | uint256                                                  | 1    | 0      | 32    |
+| sequencer         | address                                                  | 1    | 0      | 20    |
 |-------------------+----------------------------------------------------------+------+--------+-------|
-| l2Outputs         | mapping(uint256 => struct L2OutputOracle.OutputProposal) | 2    | 0      | 32    |
+| latestBlockNumber | uint256                                                  | 2    | 0      | 32    |
+|-------------------+----------------------------------------------------------+------+--------+-------|
+| l2Outputs         | mapping(uint256 => struct L2OutputOracle.OutputProposal) | 3    | 0      | 32    |
 +-------------------+----------------------------------------------------------+------+--------+-------+

 =======================

--- a/packages/contracts-bedrock/contracts/L1/L2OutputOracle.sol
+++ b/packages/contracts-bedrock/contracts/L1/L2OutputOracle.sol
@@ -48,6 +48,14 @@ contract L2OutputOracle is Ownable {
        uint256 indexed _l2BlockNumber
    );

+    /**
+     * @notice Emitted when the sequencer address is changed.
+     *
+     * @param previousSequencer The previous sequencer address.
+     * @param newSequencer      The new sequencer address.
+     */
+    event SequencerChanged(address indexed previousSequencer, address indexed newSequencer);
+
    /**
     * @notice The interval in L2 blocks at which checkpoints must be submitted.
     */
@@ -73,6 +81,11 @@ contract L2OutputOracle is Ownable {
     */
    uint256 public immutable L2_BLOCK_TIME;

+    /**
+     * @notice The address of the sequencer;
+     */
+    address public sequencer;
+
    /**
     * @notice The number of the most recent L2 block recorded in this contract.
     */
@@ -85,6 +98,14 @@ contract L2OutputOracle is Ownable {
     */
    mapping(uint256 => OutputProposal) internal l2Outputs;

+    /**
+     * @notice Reverts if called by any account other than the sequencer.
+     */
+    modifier onlySequencer() {
+        require(sequencer == msg.sender, "OutputOracle: caller is not the sequencer");
+        _;
+    }
+
    /**
     * @notice Initialize the L2OutputOracle contract.
     *
@@ -97,6 +118,7 @@ contract L2OutputOracle is Ownable {
     * @param _startingTimestamp     The timestamp of the first L2 block.
     * @param _l2BlockTime           The timestamp of the first L2 block.
     * @param _sequencer             The address of the sequencer.
+     * @param _owner                 The address of the owner.
     */
    constructor(
        uint256 _submissionInterval,
@@ -105,7 +127,8 @@ contract L2OutputOracle is Ownable {
        uint256 _startingBlockNumber,
        uint256 _startingTimestamp,
        uint256 _l2BlockTime,
-        address _sequencer
+        address _sequencer,
+        address _owner
    ) {
        require(
            _l2BlockTime < block.timestamp,
@@ -120,7 +143,8 @@ contract L2OutputOracle is Ownable {
        l2Outputs[_startingBlockNumber] = OutputProposal(_genesisL2Output, block.timestamp);
        latestBlockNumber = _startingBlockNumber;

-        _transferOwnership(_sequencer);
+        changeSequencer(_sequencer);
+        _transferOwnership(_owner);
    }

    /**
@@ -139,7 +163,7 @@ contract L2OutputOracle is Ownable {
        uint256 _l2BlockNumber,
        bytes32 _l1Blockhash,
        uint256 _l1BlockNumber
-    ) external payable onlyOwner {
+    ) external payable onlySequencer {
        require(
            _l2BlockNumber == nextBlockNumber(),
            "OutputOracle: Block number must be equal to next expected block number."
@@ -172,8 +196,11 @@ contract L2OutputOracle is Ownable {
    }

    /**
-     * @notice Deletes the most recent output.
-     *
+     * @notice Deletes the most recent output. This is used to remove the most recent output in the
+     *         event that an erreneous output is submitted. It can only be called by the contract's
+     *         owner, not the sequencer. Longer term, this should be replaced with a more robust
+     *         mechanism which will allow deletion of proposals shown to be invalid by a fault
+     *         proof.
     * @param _proposal Represents the output proposal to delete
     */
    function deleteL2Output(OutputProposal memory _proposal) external onlyOwner {
@@ -230,4 +257,15 @@ contract L2OutputOracle is Ownable {
        return
            STARTING_TIMESTAMP + ((_l2BlockNumber - STARTING_BLOCK_NUMBER) * SUBMISSION_INTERVAL);
    }
+
+    /**
+     * @notice Transfers the sequencer role to a new account (`newSequencer`).
+     *         Can only be called by the current owner.
+     */
+    function changeSequencer(address _newSequencer) public onlyOwner {
+        require(_newSequencer != address(0), "OutputOracle: new sequencer is the zero address");
+        require(_newSequencer != owner(), "OutputOracle: sequencer cannot be same as the owner");
+        emit SequencerChanged(sequencer, _newSequencer);
+        sequencer = _newSequencer;
+    }
 }
--- a/packages/contracts-bedrock/contracts/test/CommonTest.t.sol
+++ b/packages/contracts-bedrock/contracts/test/CommonTest.t.sol
@@ -42,18 +42,20 @@ contract CommonTest is Test {
        vm.fee(1000000000);
    }
 }
+
 contract L2OutputOracle_Initializer is CommonTest {
    // Test target
    L2OutputOracle oracle;

    // Constructor arguments
-    uint256 submissionInterval = 42;
+    address sequencer = 0x000000000000000000000000000000000000AbBa;
+    address owner = 0x000000000000000000000000000000000000ACDC;
+    uint256 submissionInterval = 1800;
+    uint256 l2BlockTime = 2;
    bytes32 genesisL2Output = keccak256(abi.encode(0));
    uint256 historicalTotalBlocks = 199;
    uint256 startingBlockNumber = 200;
    uint256 startingTimestamp = 1000;
-    uint256 l2BlockTime = 2;
-    address sequencer = 0x000000000000000000000000000000000000AbBa;

    // Test data
    uint256 initL1Time;
@@ -74,7 +76,8 @@ contract L2OutputOracle_Initializer is CommonTest {
            startingBlockNumber,
            startingTimestamp,
            l2BlockTime,
-            sequencer
+            sequencer,
+            owner
        );
    }
 }
@@ -82,8 +85,10 @@ contract L2OutputOracle_Initializer is CommonTest {
 contract Messenger_Initializer is L2OutputOracle_Initializer {
    OptimismPortal op;
    L1CrossDomainMessenger L1Messenger;
-    L2CrossDomainMessenger L2Messenger = L2CrossDomainMessenger(Lib_PredeployAddresses.L2_CROSS_DOMAIN_MESSENGER);
-    L2ToL1MessagePasser messagePasser = L2ToL1MessagePasser(payable(Lib_PredeployAddresses.L2_TO_L1_MESSAGE_PASSER));
+    L2CrossDomainMessenger L2Messenger =
+        L2CrossDomainMessenger(Lib_PredeployAddresses.L2_CROSS_DOMAIN_MESSENGER);
+    L2ToL1MessagePasser messagePasser =
+        L2ToL1MessagePasser(payable(Lib_PredeployAddresses.L2_TO_L1_MESSAGE_PASSER));

    event SentMessage(
        address indexed target,
@@ -139,20 +144,11 @@ contract Messenger_Initializer is L2OutputOracle_Initializer {
            address(new L2ToL1MessagePasser()).code
        );

-        vm.label(
-            Lib_PredeployAddresses.OVM_ETH,
-            "OVM_ETH"
-        );
+        vm.label(Lib_PredeployAddresses.OVM_ETH, "OVM_ETH");

-        vm.label(
-            Lib_PredeployAddresses.L2_TO_L1_MESSAGE_PASSER,
-            "L2ToL1MessagePasser"
-        );
+        vm.label(Lib_PredeployAddresses.L2_TO_L1_MESSAGE_PASSER, "L2ToL1MessagePasser");

-        vm.label(
-            Lib_PredeployAddresses.L2_CROSS_DOMAIN_MESSENGER,
-            "L2CrossDomainMessenger"
-        );
+        vm.label(Lib_PredeployAddresses.L2_CROSS_DOMAIN_MESSENGER, "L2CrossDomainMessenger");

        vm.label(
            AddressAliasHelper.applyL1ToL2Alias(address(L1Messenger)),
@@ -274,14 +270,8 @@ contract Bridge_Initializer is Messenger_Initializer {
    function setUp() public virtual override {
        super.setUp();

-        vm.label(
-            Lib_PredeployAddresses.L2_STANDARD_BRIDGE,
-            "L2StandardBridge"
-        );
-        vm.label(
-            Lib_PredeployAddresses.L2_STANDARD_TOKEN_FACTORY,
-            "L2StandardTokenFactory"
-        );
+        vm.label(Lib_PredeployAddresses.L2_STANDARD_BRIDGE, "L2StandardBridge");
+        vm.label(Lib_PredeployAddresses.L2_STANDARD_TOKEN_FACTORY, "L2StandardTokenFactory");

        // Deploy the L1 bridge and initialize it with the address of the
        // L1CrossDomainMessenger
@@ -299,32 +289,34 @@ contract Bridge_Initializer is Messenger_Initializer {
        // Set up the L2 mintable token factory
        OptimismMintableTokenFactory factory = new OptimismMintableTokenFactory();
        vm.etch(Lib_PredeployAddresses.L2_STANDARD_TOKEN_FACTORY, address(factory).code);
-        L2TokenFactory = OptimismMintableTokenFactory(Lib_PredeployAddresses.L2_STANDARD_TOKEN_FACTORY);
+        L2TokenFactory = OptimismMintableTokenFactory(
+            Lib_PredeployAddresses.L2_STANDARD_TOKEN_FACTORY
+        );
        L2TokenFactory.initialize(Lib_PredeployAddresses.L2_STANDARD_BRIDGE);

-        vm.etch(
-            Lib_PredeployAddresses.OVM_ETH,
-            address(new OVM_ETH()).code
-        );
+        vm.etch(Lib_PredeployAddresses.OVM_ETH, address(new OVM_ETH()).code);

        L1Token = new ERC20("Native L1 Token", "L1T");

        // Deploy the L2 ERC20 now
-        L2Token = OptimismMintableERC20(L2TokenFactory.createStandardL2Token(
-            address(L1Token),
-            string(abi.encodePacked("L2-", L1Token.name())),
-            string(abi.encodePacked("L2-", L1Token.symbol()))
-        ));
+        L2Token = OptimismMintableERC20(
+            L2TokenFactory.createStandardL2Token(
+                address(L1Token),
+                string(abi.encodePacked("L2-", L1Token.name())),
+                string(abi.encodePacked("L2-", L1Token.symbol()))
+            )
+        );

        NativeL2Token = new ERC20("Native L2 Token", "L2T");
        L1TokenFactory = new OptimismMintableTokenFactory();
        L1TokenFactory.initialize(address(L1Bridge));

-        RemoteL1Token = OptimismMintableERC20(L1TokenFactory.createStandardL2Token(
-            address(NativeL2Token),
-            string(abi.encodePacked("L1-", NativeL2Token.name())),
-            string(abi.encodePacked("L1-", NativeL2Token.symbol()))
-        ));
+        RemoteL1Token = OptimismMintableERC20(
+            L1TokenFactory.createStandardL2Token(
+                address(NativeL2Token),
+                string(abi.encodePacked("L1-", NativeL2Token.name())),
+                string(abi.encodePacked("L1-", NativeL2Token.symbol()))
+            )
+        );
    }
 }
-
--- a/packages/contracts-bedrock/contracts/test/L2OutputOracle.t.sol
+++ b/packages/contracts-bedrock/contracts/test/L2OutputOracle.t.sol
@@ -11,19 +11,20 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        super.setUp();
    }

-    // advance the evm state to meet the L2OutputOracle's requirements for appendL2Output
-    function oracleWarpRoll(uint256 _nextBlockNumber) public {
-        vm.roll(_nextBlockNumber);
+    // Advance the evm's time to meet the L2OutputOracle's requirements for appendL2Output
+    function warpToAppendTime(uint256 _nextBlockNumber) public {
        vm.warp(oracle.computeL2Timestamp(_nextBlockNumber) + 1);
    }

    function test_constructor() external {
-        assertEq(oracle.owner(), sequencer);
+        assertEq(oracle.owner(), owner);
        assertEq(oracle.SUBMISSION_INTERVAL(), submissionInterval);
        assertEq(oracle.HISTORICAL_TOTAL_BLOCKS(), historicalTotalBlocks);
        assertEq(oracle.latestBlockNumber(), startingBlockNumber);
        assertEq(oracle.STARTING_BLOCK_NUMBER(), startingBlockNumber);
        assertEq(oracle.STARTING_TIMESTAMP(), startingTimestamp);
+        assertEq(oracle.sequencer(), sequencer);
+        assertEq(oracle.owner(), owner);

        L2OutputOracle.OutputProposal memory proposal = oracle.getL2Output(startingBlockNumber);
        assertEq(proposal.outputRoot, genesisL2Output);
@@ -39,7 +40,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        uint256 appendedNumber = oracle.nextBlockNumber();

        // Roll to after the block number we'll append
-        oracleWarpRoll(appendedNumber);
+        warpToAppendTime(appendedNumber);
        vm.prank(sequencer);
        oracle.appendL2Output(appendedOutput1, appendedNumber, 0, 0);
        assertEq(oracle.latestBlockNumber(), appendedNumber);
@@ -48,7 +49,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
    // Test: getL2Output() should return the correct value
    function test_getL2Output() external {
        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        vm.prank(sequencer);
        oracle.appendL2Output(appendedOutput1, nextBlockNumber, 0, 0);

@@ -72,7 +73,9 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {

    function test_computeL2Timestamp() external {
        // reverts if timestamp is too low
-        vm.expectRevert("OutputOracle: Block number must be greater than or equal to the starting block number.");
+        vm.expectRevert(
+            "OutputOracle: Block number must be greater than or equal to the starting block number."
+        );
        oracle.computeL2Timestamp(startingBlockNumber - 1);

        // returns the correct value...
@@ -80,12 +83,63 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        assertEq(oracle.computeL2Timestamp(startingBlockNumber), startingTimestamp);

        // ... for the first block after the starting block
-        assertEq(oracle.computeL2Timestamp(startingBlockNumber + 1), startingTimestamp + submissionInterval);
+        assertEq(
+            oracle.computeL2Timestamp(startingBlockNumber + 1),
+            startingTimestamp + submissionInterval
+        );

        // ... for some other block number
-        assertEq(oracle.computeL2Timestamp(startingBlockNumber + 96024), startingTimestamp + submissionInterval * 96024);
+        assertEq(
+            oracle.computeL2Timestamp(startingBlockNumber + 96024),
+            startingTimestamp + submissionInterval * 96024
+        );
+    }
+
+    /*******************
+     * Ownership tests *
+     *******************/
+
+    event SequencerChanged(address indexed previousSequencer, address indexed newSequencer);
+
+    function test_changeSequencer() public {
+        address newSequencer = address(20);
+        vm.expectRevert("Ownable: caller is not the owner");
+        oracle.changeSequencer(newSequencer);
+
+        vm.startPrank(owner);
+        vm.expectRevert("OutputOracle: new sequencer is the zero address");
+        oracle.changeSequencer(address(0));
+
+        vm.expectRevert("OutputOracle: sequencer cannot be same as the owner");
+        oracle.changeSequencer(owner);
+
+        // Double check sequencer has not changed.
+        assertEq(sequencer, oracle.sequencer());
+
+        vm.expectEmit(true, true, true, true);
+        emit SequencerChanged(sequencer, newSequencer);
+        oracle.changeSequencer(newSequencer);
+        vm.stopPrank();
+    }
+
+    event OwnershipTransferred(address indexed, address indexed);
+
+    function test_updateOwner() public {
+        address newOwner = address(21);
+        vm.expectRevert("Ownable: caller is not the owner");
+        oracle.transferOwnership(newOwner);
+        // Double check owner has not changed.
+        assertEq(owner, oracle.owner());
+
+        vm.startPrank(owner);
+        vm.expectEmit(true, true, true, true);
+        emit OwnershipTransferred(owner, newOwner);
+        oracle.transferOwnership(newOwner);
+        vm.stopPrank();
    }

+    // Test updating owner
+
    /*****************************
     * Append Tests - Happy Path *
     *****************************/
@@ -95,7 +149,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
    function test_appendingAnotherOutput() public {
        bytes32 appendedOutput2 = keccak256(abi.encode(2));
        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        uint256 appendedNumber = oracle.latestBlockNumber();

        // Ensure the submissionInterval is enforced
@@ -114,7 +168,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        bytes32 prevL1BlockHash = blockhash(prevL1BlockNumber);

        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        vm.prank(sequencer);
        oracle.appendL2Output(nonZeroHash, nextBlockNumber, prevL1BlockHash, prevL1BlockNumber);
    }
@@ -126,10 +180,10 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
    // Test: appendL2Output fails if called by a party that is not the sequencer.
    function testCannot_appendOutputIfNotSequencer() external {
        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);

        vm.prank(address(128));
-        vm.expectRevert("Ownable: caller is not the owner");
+        vm.expectRevert("OutputOracle: caller is not the sequencer");
        oracle.appendL2Output(nonZeroHash, nextBlockNumber, 0, 0);
    }

@@ -137,7 +191,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
    function testCannot_appendEmptyOutput() external {
        bytes32 outputToAppend = bytes32(0);
        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        vm.prank(sequencer);
        vm.expectRevert("OutputOracle: Cannot submit empty L2 output.");
        oracle.appendL2Output(outputToAppend, nextBlockNumber, 0, 0);
@@ -146,11 +200,12 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
    // Test: appendL2Output fails if the block number doesn't match the next expected number.
    function testCannot_appendUnexpectedBlockNumber() external {
        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        vm.prank(sequencer);
        vm.expectRevert("OutputOracle: Block number must be equal to next expected block number.");
        oracle.appendL2Output(nonZeroHash, nextBlockNumber - 1, 0, 0);
    }
+
    // Test: appendL2Output fails if it would have a timestamp in the future.
    function testCannot_appendFutureTimetamp() external {
        uint256 nextBlockNumber = oracle.nextBlockNumber();
@@ -165,7 +220,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
    // protection.
    function testCannot_appendOnWrongFork() external {
        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        vm.prank(sequencer);
        vm.expectRevert("OutputOracle: Blockhash does not match the hash at the expected height.");
        oracle.appendL2Output(
@@ -189,16 +244,16 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        bytes32 l1BlockHash = blockhash(l1BlockNumber);

        uint256 nextBlockNumber = oracle.nextBlockNumber();
-        oracleWarpRoll(nextBlockNumber);
+        warpToAppendTime(nextBlockNumber);
        vm.prank(sequencer);

        // This will fail when foundry no longer returns zerod block hashes
        oracle.appendL2Output(nonZeroHash, nextBlockNumber, l1BlockHash, l1BlockNumber - 1);
    }

-    /****************
-     * Delete Tests *
-     ****************/
+    /*****************************
+     * Delete Tests - Happy Path *
+     *****************************/

    event L2OutputDeleted(
        bytes32 indexed _l2Output,
@@ -206,15 +261,18 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        uint256 indexed _l2BlockNumber
    );

-
    function test_deleteL2Output() external {
        test_appendingAnotherOutput();

        uint256 latestBlockNumber = oracle.latestBlockNumber();
-        L2OutputOracle.OutputProposal memory proposalToDelete = oracle.getL2Output(latestBlockNumber);
-        L2OutputOracle.OutputProposal memory newLatestOutput = oracle.getL2Output(latestBlockNumber - submissionInterval);
+        L2OutputOracle.OutputProposal memory proposalToDelete = oracle.getL2Output(
+            latestBlockNumber
+        );
+        L2OutputOracle.OutputProposal memory newLatestOutput = oracle.getL2Output(
+            latestBlockNumber - submissionInterval
+        );

-        vm.prank(sequencer);
+        vm.prank(owner);
        vm.expectEmit(true, true, false, false);
        emit L2OutputDeleted(
            proposalToDelete.outputRoot,
@@ -225,10 +283,7 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {

        // validate latestBlockNumber has been reduced
        uint256 latestBlockNumberAfter = oracle.latestBlockNumber();
-        assertEq(
-            latestBlockNumber - submissionInterval,
-            latestBlockNumberAfter
-        );
+        assertEq(latestBlockNumber - submissionInterval, latestBlockNumberAfter);

        L2OutputOracle.OutputProposal memory proposal = oracle.getL2Output(latestBlockNumberAfter);
        // validate that the new latest output is as expected.
@@ -236,7 +291,11 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        assertEq(newLatestOutput.timestamp, proposal.timestamp);
    }

-    function testCannot_deleteL2Output_ifNotSequencer() external {
+    /***************************
+     * Delete Tests - Sad Path *
+     ***************************/
+
+    function testCannot_deleteL2Output_ifNotOwner() external {
        uint256 latestBlockNumber = oracle.latestBlockNumber();
        L2OutputOracle.OutputProposal memory proposal = oracle.getL2Output(latestBlockNumber);

@@ -244,14 +303,35 @@ contract L2OutputOracleTest is L2OutputOracle_Initializer {
        oracle.deleteL2Output(proposal);
    }

-    function testCannot_deleteWrongL2Output() external {
+    function testCannot_deleteL2Output_withWrongRoot() external {
        test_appendingAnotherOutput();

        uint256 previousBlockNumber = oracle.latestBlockNumber() - submissionInterval;
-        L2OutputOracle.OutputProposal memory proposalToDelete = oracle.getL2Output(previousBlockNumber);
+        L2OutputOracle.OutputProposal memory proposalToDelete = oracle.getL2Output(
+            previousBlockNumber
+        );

-        vm.prank(sequencer);
-        vm.expectRevert("OutputOracle: The output root to delete does not match the latest output proposal.");
+        vm.prank(owner);
+        vm.expectRevert(
+            "OutputOracle: The output root to delete does not match the latest output proposal."
+        );
+        oracle.deleteL2Output(proposalToDelete);
+    }
+
+    function testCannot_deleteL2Output_withWrongTime() external {
+        test_appendingAnotherOutput();
+
+        uint256 latestBlockNumber = oracle.latestBlockNumber();
+        L2OutputOracle.OutputProposal memory proposalToDelete = oracle.getL2Output(
+            latestBlockNumber
+        );
+
+        // Modify the timestamp so that it does not match.
+        proposalToDelete.timestamp -= 1;
+        vm.prank(owner);
+        vm.expectRevert(
+            "OutputOracle: The timestamp to delete does not match the latest output proposal."
+        );
        oracle.deleteL2Output(proposalToDelete);
    }
 }
--- a/packages/contracts-bedrock/deploy-config/devnetL1.ts
+++ b/packages/contracts-bedrock/deploy-config/devnetL1.ts
@@ -9,6 +9,7 @@ const config = {
    parseInt(process.env.L2OO_STARTING_BLOCK_TIMESTAMP, 10) || Date.now(),
  l2BlockTime: 2,
  sequencerAddress: '0x70997970C51812dc3A010C7d01b50e0d17dc79C8',
+  ownerAddress: '0x70997970C51812dc3A010C7d01b50e0d17dc79C8',
 }

 export default config
--- a/packages/contracts-bedrock/deploy-config/hardhat.ts
+++ b/packages/contracts-bedrock/deploy-config/hardhat.ts
@@ -9,6 +9,7 @@ const config = {
    parseInt(process.env.L2OO_STARTING_BLOCK_TIMESTAMP, 10) || Date.now(),
  l2BlockTime: 2,
  sequencerAddress: '0x70997970C51812dc3A010C7d01b50e0d17dc79C8',
+  ownerAddress: '0x70997970C51812dc3A010C7d01b50e0d17dc79C8',
 }

 export default config
--- a/packages/contracts-bedrock/deploy/000-L2OutputOracle.deploy.ts
+++ b/packages/contracts-bedrock/deploy/000-L2OutputOracle.deploy.ts
@@ -25,6 +25,7 @@ const deployFn: DeployFunction = async (hre) => {
      hre.deployConfig.startingTimestamp,
      hre.deployConfig.l2BlockTime,
      hre.deployConfig.sequencerAddress,
+      hre.deployConfig.ownerAddress,
    ],
    log: true,
    waitConfirmations: 1,

--- a/packages/contracts-bedrock/hardhat.config.ts
+++ b/packages/contracts-bedrock/hardhat.config.ts
@@ -80,6 +80,9 @@ const config: HardhatUserConfig = {
    sequencerAddress: {
      type: 'address',
    },
+    ownerAddress: {
+      type: 'address',
+    },
  },
  solidity: {
    compilers: [