Merge branch 'develop' into deps/rm-dead-deps

docs/fault-proof-alpha/README.md

@@ -9,7 +9,11 @@ finalized and may change without notice.
 
 ### Contents
 
- * Overview
+ * Specifications
+   * [Generic Fault Proof System](../../specs/fault-proof.md)
+   * [Generic Dispute Game Interface](../../specs/dispute-game-interface.md)
+   * [Fault Dispute Game](../../specs/fault-dispute-game.md)
+   * [Cannon VM](../../specs/cannon-fault-proof-vm.md)
  * [Deployment Details](./deployments.md)
  * [Manual Usage](./manual.md)
    * [Creating Traces with Cannon](./cannon.md)

op-challenger/README.md

@@ -3,7 +3,7 @@
 The `op-challenger` is a modular **op-stack** challenge agent
 written in golang for dispute games including, but not limited to, attestation games, fault
 games, and validity games. To learn more about dispute games, visit the
-[dispute game specs](../specs/dispute-game.md).
+[fault proof specs](../specs/fault-proof.md).
 
 ## Quickstart
 

op-challenger/game/fault/agent.go

@@ -17,8 +17,7 @@ import (
 type Responder interface {
 	CallResolve(ctx context.Context) (gameTypes.GameStatus, error)
 	Resolve(ctx context.Context) error
-	Respond(ctx context.Context, response types.Claim) error
-	Step(ctx context.Context, stepData types.StepCallData) error
+	PerformAction(ctx context.Context, action solver.Action) error
 }
 
 type ClaimLoader interface {
@@ -27,7 +26,7 @@ type ClaimLoader interface {
 
 type Agent struct {
 	metrics                 metrics.Metricer
-	solver                  *solver.Solver
+	solver                  *solver.GameSolver
 	loader                  ClaimLoader
 	responder               Responder
 	updater                 types.OracleUpdater
@@ -39,7 +38,7 @@ type Agent struct {
 func NewAgent(m metrics.Metricer, loader ClaimLoader, maxDepth int, trace types.TraceProvider, responder Responder, updater types.OracleUpdater, agreeWithProposedOutput bool, log log.Logger) *Agent {
 	return &Agent{
 		metrics:                 m,
-		solver:                  solver.NewSolver(maxDepth, trace),
+		solver:                  solver.NewGameSolver(maxDepth, trace),
 		loader:                  loader,
 		responder:               responder,
 		updater:                 updater,
@@ -58,16 +57,34 @@ func (a *Agent) Act(ctx context.Context) error {
 	if err != nil {
 		return fmt.Errorf("create game from contracts: %w", err)
 	}
-	// Create counter claims
-	for _, claim := range game.Claims() {
-		if err := a.move(ctx, claim, game); err != nil && !errors.Is(err, types.ErrGameDepthReached) {
-			log.Error("Failed to move", "err", err)
-		}
+
+	// Calculate the actions to take
+	actions, err := a.solver.CalculateNextActions(ctx, game)
+	if err != nil {
+		log.Error("Failed to calculate all required moves", "err", err)
 	}
-	// Step on all leaf claims
-	for _, claim := range game.Claims() {
-		if err := a.step(ctx, claim, game); err != nil {
-			log.Error("Failed to step", "err", err)
+
+	// Perform the actions
+	for _, action := range actions {
+		log := a.log.New("action", action.Type, "is_attack", action.IsAttack, "parent", action.ParentIdx, "value", action.Value)
+
+		if action.OracleData != nil {
+			a.log.Info("Updating oracle data", "oracleKey", action.OracleData.OracleKey, "oracleData", action.OracleData.OracleData)
+			if err := a.updater.UpdateOracle(ctx, action.OracleData); err != nil {
+				return fmt.Errorf("failed to load oracle data: %w", err)
+			}
+		}
+
+		switch action.Type {
+		case solver.ActionTypeMove:
+			a.metrics.RecordGameMove()
+		case solver.ActionTypeStep:
+			a.metrics.RecordGameStep()
+		}
+		log.Info("Performing action")
+		err := a.responder.PerformAction(ctx, action)
+		if err != nil {
+			log.Error("Action failed", "err", err)
 		}
 	}
 	return nil
@@ -118,68 +135,3 @@ func (a *Agent) newGameFromContracts(ctx context.Context) (types.Game, error) {
 	}
 	return game, nil
 }
-
-// move determines & executes the next move given a claim
-func (a *Agent) move(ctx context.Context, claim types.Claim, game types.Game) error {
-	nextMove, err := a.solver.NextMove(ctx, claim, game.AgreeWithClaimLevel(claim))
-	if err != nil {
-		return fmt.Errorf("execute next move: %w", err)
-	}
-	if nextMove == nil {
-		a.log.Debug("No next move")
-		return nil
-	}
-	move := *nextMove
-	log := a.log.New("is_defend", move.DefendsParent(), "depth", move.Depth(), "index_at_depth", move.IndexAtDepth(),
-		"value", move.Value, "trace_index", move.TraceIndex(a.maxDepth),
-		"parent_value", claim.Value, "parent_trace_index", claim.TraceIndex(a.maxDepth))
-	if game.IsDuplicate(move) {
-		log.Debug("Skipping duplicate move")
-		return nil
-	}
-	a.metrics.RecordGameMove()
-	log.Info("Performing move")
-	return a.responder.Respond(ctx, move)
-}
-
-// step determines & executes the next step against a leaf claim through the responder
-func (a *Agent) step(ctx context.Context, claim types.Claim, game types.Game) error {
-	if claim.Depth() != a.maxDepth {
-		return nil
-	}
-
-	agreeWithClaimLevel := game.AgreeWithClaimLevel(claim)
-	if agreeWithClaimLevel {
-		a.log.Debug("Agree with leaf claim, skipping step", "claim_depth", claim.Depth(), "maxDepth", a.maxDepth)
-		return nil
-	}
-
-	if claim.Countered {
-		a.log.Debug("Step already executed against claim", "depth", claim.Depth(), "index_at_depth", claim.IndexAtDepth(), "value", claim.Value)
-		return nil
-	}
-
-	a.log.Info("Attempting step", "claim_depth", claim.Depth(), "maxDepth", a.maxDepth)
-	step, err := a.solver.AttemptStep(ctx, claim, agreeWithClaimLevel)
-	if err != nil {
-		return fmt.Errorf("attempt step: %w", err)
-	}
-
-	if step.OracleData != nil {
-		a.log.Info("Updating oracle data", "oracleKey", step.OracleData.OracleKey, "oracleData", step.OracleData.OracleData)
-		if err := a.updater.UpdateOracle(ctx, step.OracleData); err != nil {
-			return fmt.Errorf("failed to load oracle data: %w", err)
-		}
-	}
-
-	a.log.Info("Performing step", "is_attack", step.IsAttack,
-		"depth", step.LeafClaim.Depth(), "index_at_depth", step.LeafClaim.IndexAtDepth(), "value", step.LeafClaim.Value)
-	a.metrics.RecordGameStep()
-	callData := types.StepCallData{
-		ClaimIndex: uint64(step.LeafClaim.ContractIndex),
-		IsAttack:   step.IsAttack,
-		StateData:  step.PreState,
-		Proof:      step.ProofData,
-	}
-	return a.responder.Step(ctx, callData)
-}

op-challenger/game/fault/agent_test.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/solver"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/test"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/trace/alphabet"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
@@ -144,11 +145,7 @@ func (s *stubResponder) Resolve(ctx context.Context) error {
 	return s.resolveErr
 }
 
-func (s *stubResponder) Respond(ctx context.Context, response types.Claim) error {
-	panic("Not implemented")
-}
-
-func (s *stubResponder) Step(ctx context.Context, stepData types.StepCallData) error {
+func (s *stubResponder) PerformAction(ctx context.Context, response solver.Action) error {
 	panic("Not implemented")
 }
 

op-challenger/game/fault/responder/abi_test.go

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/ethereum-optimism/optimism/op-bindings/bindings"
-	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
 	"github.com/ethereum/go-ethereum/common"
@@ -94,12 +93,7 @@ func TestBuildFaultStepData(t *testing.T) {
 
 	resp, _ := newTestFaultResponder(t)
 
-	data, err := resp.buildStepTxData(types.StepCallData{
-		ClaimIndex: 2,
-		IsAttack:   false,
-		StateData:  []byte{0x01},
-		Proof:      []byte{0x02},
-	})
+	data, err := resp.buildStepTxData(2, false, []byte{0x01}, []byte{0x02})
 	require.NoError(t, err)
 
 	opts.GasLimit = 100_000

op-challenger/game/fault/responder/responder.go

@@ -5,7 +5,7 @@ import (
 	"math/big"
 
 	"github.com/ethereum-optimism/optimism/op-bindings/bindings"
-	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/solver"
 	gameTypes "github.com/ethereum-optimism/optimism/op-challenger/game/types"
 	"github.com/ethereum-optimism/optimism/op-service/txmgr"
 
@@ -16,8 +16,8 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 )
 
-// faultResponder implements the [Responder] interface to send onchain transactions.
-type faultResponder struct {
+// FaultResponder implements the [Responder] interface to send onchain transactions.
+type FaultResponder struct {
 	log log.Logger
 
 	txMgr txmgr.TxManager
@@ -26,13 +26,13 @@ type faultResponder struct {
 	fdgAbi  *abi.ABI
 }
 
-// NewFaultResponder returns a new [faultResponder].
-func NewFaultResponder(logger log.Logger, txManagr txmgr.TxManager, fdgAddr common.Address) (*faultResponder, error) {
+// NewFaultResponder returns a new [FaultResponder].
+func NewFaultResponder(logger log.Logger, txManagr txmgr.TxManager, fdgAddr common.Address) (*FaultResponder, error) {
 	fdgAbi, err := bindings.FaultDisputeGameMetaData.GetAbi()
 	if err != nil {
 		return nil, err
 	}
-	return &faultResponder{
+	return &FaultResponder{
 		log:     logger,
 		txMgr:   txManagr,
 		fdgAddr: fdgAddr,
@@ -41,7 +41,7 @@ func NewFaultResponder(logger log.Logger, txManagr txmgr.TxManager, fdgAddr comm
 }
 
 // buildFaultDefendData creates the transaction data for the Defend function.
-func (r *faultResponder) buildFaultDefendData(parentContractIndex int, pivot [32]byte) ([]byte, error) {
+func (r *FaultResponder) buildFaultDefendData(parentContractIndex int, pivot [32]byte) ([]byte, error) {
 	return r.fdgAbi.Pack(
 		"defend",
 		big.NewInt(int64(parentContractIndex)),
@@ -50,7 +50,7 @@ func (r *faultResponder) buildFaultDefendData(parentContractIndex int, pivot [32
 }
 
 // buildFaultAttackData creates the transaction data for the Attack function.
-func (r *faultResponder) buildFaultAttackData(parentContractIndex int, pivot [32]byte) ([]byte, error) {
+func (r *FaultResponder) buildFaultAttackData(parentContractIndex int, pivot [32]byte) ([]byte, error) {
 	return r.fdgAbi.Pack(
 		"attack",
 		big.NewInt(int64(parentContractIndex)),
@@ -59,30 +59,13 @@ func (r *faultResponder) buildFaultAttackData(parentContractIndex int, pivot [32
 }
 
 // buildResolveData creates the transaction data for the Resolve function.
-func (r *faultResponder) buildResolveData() ([]byte, error) {
+func (r *FaultResponder) buildResolveData() ([]byte, error) {
 	return r.fdgAbi.Pack("resolve")
 }
 
-// BuildTx builds the transaction for the [faultResponder].
-func (r *faultResponder) BuildTx(ctx context.Context, response types.Claim) ([]byte, error) {
-	if response.DefendsParent() {
-		txData, err := r.buildFaultDefendData(response.ParentContractIndex, response.ValueBytes())
-		if err != nil {
-			return nil, err
-		}
-		return txData, nil
-	} else {
-		txData, err := r.buildFaultAttackData(response.ParentContractIndex, response.ValueBytes())
-		if err != nil {
-			return nil, err
-		}
-		return txData, nil
-	}
-}
-
 // CallResolve determines if the resolve function on the fault dispute game contract
 // would succeed. Returns the game status if the call would succeed, errors otherwise.
-func (r *faultResponder) CallResolve(ctx context.Context) (gameTypes.GameStatus, error) {
+func (r *FaultResponder) CallResolve(ctx context.Context) (gameTypes.GameStatus, error) {
 	txData, err := r.buildResolveData()
 	if err != nil {
 		return gameTypes.GameStatusInProgress, err
@@ -102,7 +85,7 @@ func (r *faultResponder) CallResolve(ctx context.Context) (gameTypes.GameStatus,
 }
 
 // Resolve executes a resolve transaction to resolve a fault dispute game.
-func (r *faultResponder) Resolve(ctx context.Context) error {
+func (r *FaultResponder) Resolve(ctx context.Context) error {
 	txData, err := r.buildResolveData()
 	if err != nil {
 		return err
@@ -111,9 +94,19 @@ func (r *faultResponder) Resolve(ctx context.Context) error {
 	return r.sendTxAndWait(ctx, txData)
 }
 
-// Respond takes a [Claim] and executes the response action.
-func (r *faultResponder) Respond(ctx context.Context, response types.Claim) error {
-	txData, err := r.BuildTx(ctx, response)
+func (r *FaultResponder) PerformAction(ctx context.Context, action solver.Action) error {
+	var txData []byte
+	var err error
+	switch action.Type {
+	case solver.ActionTypeMove:
+		if action.IsAttack {
+			txData, err = r.buildFaultAttackData(action.ParentIdx, action.Value)
+		} else {
+			txData, err = r.buildFaultDefendData(action.ParentIdx, action.Value)
+		}
+	case solver.ActionTypeStep:
+		txData, err = r.buildStepTxData(uint64(action.ParentIdx), action.IsAttack, action.PreState, action.ProofData)
+	}
 	if err != nil {
 		return err
 	}
@@ -122,7 +115,7 @@ func (r *faultResponder) Respond(ctx context.Context, response types.Claim) erro
 
 // sendTxAndWait sends a transaction through the [txmgr] and waits for a receipt.
 // This sets the tx GasLimit to 0, performing gas estimation online through the [txmgr].
-func (r *faultResponder) sendTxAndWait(ctx context.Context, txData []byte) error {
+func (r *FaultResponder) sendTxAndWait(ctx context.Context, txData []byte) error {
 	receipt, err := r.txMgr.Send(ctx, txmgr.TxCandidate{
 		To:       &r.fdgAddr,
 		TxData:   txData,
@@ -140,21 +133,12 @@ func (r *faultResponder) sendTxAndWait(ctx context.Context, txData []byte) error
 }
 
 // buildStepTxData creates the transaction data for the step function.
-func (r *faultResponder) buildStepTxData(stepData types.StepCallData) ([]byte, error) {
+func (r *FaultResponder) buildStepTxData(claimIdx uint64, isAttack bool, stateData []byte, proof []byte) ([]byte, error) {
 	return r.fdgAbi.Pack(
 		"step",
-		big.NewInt(int64(stepData.ClaimIndex)),
-		stepData.IsAttack,
-		stepData.StateData,
-		stepData.Proof,
+		big.NewInt(int64(claimIdx)),
+		isAttack,
+		stateData,
+		proof,
 	)
 }
-
-// Step accepts step data and executes the step on the fault dispute game contract.
-func (r *faultResponder) Step(ctx context.Context, stepData types.StepCallData) error {
-	txData, err := r.buildStepTxData(stepData)
-	if err != nil {
-		return err
-	}
-	return r.sendTxAndWait(ctx, txData)
-}

op-challenger/game/fault/responder/responder_test.go

@@ -7,7 +7,7 @@ import (
 	"testing"
 
 	"github.com/ethereum-optimism/optimism/op-bindings/bindings"
-	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/solver"
 	gameTypes "github.com/ethereum-optimism/optimism/op-challenger/game/types"
 	"github.com/ethereum-optimism/optimism/op-node/testlog"
 	"github.com/ethereum-optimism/optimism/op-service/txmgr"
@@ -74,73 +74,98 @@ func TestResolve(t *testing.T) {
 }
 
 // TestRespond tests the [Responder.Respond] method.
-func TestRespond(t *testing.T) {
+func TestPerformAction(t *testing.T) {
 	t.Run("send fails", func(t *testing.T) {
 		responder, mockTxMgr := newTestFaultResponder(t)
 		mockTxMgr.sendFails = true
-		err := responder.Respond(context.Background(), generateMockResponseClaim())
+		err := responder.PerformAction(context.Background(), solver.Action{
+			Type:      solver.ActionTypeMove,
+			ParentIdx: 123,
+			IsAttack:  true,
+			Value:     common.Hash{0xaa},
+		})
 		require.ErrorIs(t, err, mockSendError)
 		require.Equal(t, 0, mockTxMgr.sends)
 	})
 
 	t.Run("sends response", func(t *testing.T) {
 		responder, mockTxMgr := newTestFaultResponder(t)
-		err := responder.Respond(context.Background(), generateMockResponseClaim())
+		err := responder.PerformAction(context.Background(), solver.Action{
+			Type:      solver.ActionTypeMove,
+			ParentIdx: 123,
+			IsAttack:  true,
+			Value:     common.Hash{0xaa},
+		})
 		require.NoError(t, err)
 		require.Equal(t, 1, mockTxMgr.sends)
 	})
-}
 
-// TestBuildTx tests the [Responder.BuildTx] method.
-func TestBuildTx(t *testing.T) {
 	t.Run("attack", func(t *testing.T) {
-		responder, _ := newTestFaultResponder(t)
-		responseClaim := generateMockResponseClaim()
-		responseClaim.ParentContractIndex = 7
-		tx, err := responder.BuildTx(context.Background(), responseClaim)
+		responder, mockTxMgr := newTestFaultResponder(t)
+		action := solver.Action{
+			Type:      solver.ActionTypeMove,
+			ParentIdx: 123,
+			IsAttack:  true,
+			Value:     common.Hash{0xaa},
+		}
+		err := responder.PerformAction(context.Background(), action)
 		require.NoError(t, err)
 
 		// Pack the tx data manually.
 		fdgAbi, err := bindings.FaultDisputeGameMetaData.GetAbi()
 		require.NoError(t, err)
-		parent := big.NewInt(int64(7))
-		claim := responseClaim.ValueBytes()
-		expected, err := fdgAbi.Pack("attack", parent, claim)
-
+		expected, err := fdgAbi.Pack("attack", big.NewInt(int64(action.ParentIdx)), action.Value)
 		require.NoError(t, err)
-		require.Equal(t, expected, tx)
+
+		require.Len(t, mockTxMgr.sent, 1)
+		require.Equal(t, expected, mockTxMgr.sent[0].TxData)
 	})
 
 	t.Run("defend", func(t *testing.T) {
-		responder, _ := newTestFaultResponder(t)
-		responseClaim := types.Claim{
-			ClaimData: types.ClaimData{
-				Value:    common.Hash{0x01},
-				Position: types.NewPositionFromGIndex(3),
-			},
-			Parent: types.ClaimData{
-				Value:    common.Hash{0x02},
-				Position: types.NewPositionFromGIndex(6),
-			},
-			ContractIndex:       0,
-			ParentContractIndex: 7,
+		responder, mockTxMgr := newTestFaultResponder(t)
+		action := solver.Action{
+			Type:      solver.ActionTypeMove,
+			ParentIdx: 123,
+			IsAttack:  false,
+			Value:     common.Hash{0xaa},
 		}
-		tx, err := responder.BuildTx(context.Background(), responseClaim)
+		err := responder.PerformAction(context.Background(), action)
 		require.NoError(t, err)
 
 		// Pack the tx data manually.
 		fdgAbi, err := bindings.FaultDisputeGameMetaData.GetAbi()
 		require.NoError(t, err)
-		parent := big.NewInt(int64(7))
-		claim := responseClaim.ValueBytes()
-		expected, err := fdgAbi.Pack("defend", parent, claim)
+		expected, err := fdgAbi.Pack("defend", big.NewInt(int64(action.ParentIdx)), action.Value)
+		require.NoError(t, err)
+
+		require.Len(t, mockTxMgr.sent, 1)
+		require.Equal(t, expected, mockTxMgr.sent[0].TxData)
+	})
+
+	t.Run("step", func(t *testing.T) {
+		responder, mockTxMgr := newTestFaultResponder(t)
+		action := solver.Action{
+			Type:      solver.ActionTypeStep,
+			ParentIdx: 123,
+			IsAttack:  true,
+			PreState:  []byte{1, 2, 3},
+			ProofData: []byte{4, 5, 6},
+		}
+		err := responder.PerformAction(context.Background(), action)
+		require.NoError(t, err)
 
+		// Pack the tx data manually.
+		fdgAbi, err := bindings.FaultDisputeGameMetaData.GetAbi()
 		require.NoError(t, err)
-		require.Equal(t, expected, tx)
+		expected, err := fdgAbi.Pack("step", big.NewInt(int64(action.ParentIdx)), true, action.PreState, action.ProofData)
+		require.NoError(t, err)
+
+		require.Len(t, mockTxMgr.sent, 1)
+		require.Equal(t, expected, mockTxMgr.sent[0].TxData)
 	})
 }
 
-func newTestFaultResponder(t *testing.T) (*faultResponder, *mockTxManager) {
+func newTestFaultResponder(t *testing.T) (*FaultResponder, *mockTxManager) {
 	log := testlog.Logger(t, log.LvlError)
 	mockTxMgr := &mockTxManager{}
 	responder, err := NewFaultResponder(log, mockTxMgr, mockFdgAddress)
@@ -151,6 +176,7 @@ func newTestFaultResponder(t *testing.T) (*faultResponder, *mockTxManager) {
 type mockTxManager struct {
 	from      common.Address
 	sends     int
+	sent      []txmgr.TxCandidate
 	calls     int
 	sendFails bool
 	callFails bool
@@ -162,6 +188,7 @@ func (m *mockTxManager) Send(ctx context.Context, candidate txmgr.TxCandidate) (
 		return nil, mockSendError
 	}
 	m.sends++
+	m.sent = append(m.sent, candidate)
 	return ethtypes.NewReceipt(
 		[]byte{},
 		false,
@@ -189,18 +216,3 @@ func (m *mockTxManager) BlockNumber(ctx context.Context) (uint64, error) {
 func (m *mockTxManager) From() common.Address {
 	return m.from
 }
-
-func generateMockResponseClaim() types.Claim {
-	return types.Claim{
-		ClaimData: types.ClaimData{
-			Value:    common.Hash{0x01},
-			Position: types.NewPositionFromGIndex(2),
-		},
-		Parent: types.ClaimData{
-			Value:    common.Hash{0x02},
-			Position: types.NewPositionFromGIndex(1),
-		},
-		ContractIndex:       0,
-		ParentContractIndex: 0,
-	}
-}

op-challenger/game/fault/solver/game_solver.go

+package solver
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
+	"github.com/ethereum/go-ethereum/common"
+)
+
+type ActionType string
+
+const (
+	ActionTypeMove ActionType = "move"
+	ActionTypeStep ActionType = "step"
+)
+
+func (a ActionType) String() string {
+	return string(a)
+}
+
+type Action struct {
+	Type      ActionType
+	ParentIdx int
+	IsAttack  bool
+
+	// Moves
+	Value common.Hash
+
+	// Steps
+	PreState   []byte
+	ProofData  []byte
+	OracleData *types.PreimageOracleData
+}
+
+type GameSolver struct {
+	claimSolver *claimSolver
+	gameDepth   int
+}
+
+func NewGameSolver(gameDepth int, trace types.TraceProvider) *GameSolver {
+	return &GameSolver{
+		claimSolver: newClaimSolver(gameDepth, trace),
+		gameDepth:   gameDepth,
+	}
+}
+
+func (s *GameSolver) CalculateNextActions(ctx context.Context, game types.Game) ([]Action, error) {
+	var errs []error
+	var actions []Action
+	for _, claim := range game.Claims() {
+		var action *Action
+		var err error
+		if claim.Depth() == s.gameDepth {
+			action, err = s.calculateStep(ctx, game, claim)
+		} else {
+			action, err = s.calculateMove(ctx, game, claim)
+		}
+		if err != nil {
+			errs = append(errs, err)
+			continue
+		}
+		if action == nil {
+			continue
+		}
+		actions = append(actions, *action)
+	}
+	return actions, errors.Join(errs...)
+}
+
+func (s *GameSolver) calculateStep(ctx context.Context, game types.Game, claim types.Claim) (*Action, error) {
+	if claim.Countered {
+		return nil, nil
+	}
+	if game.AgreeWithClaimLevel(claim) {
+		return nil, nil
+	}
+	step, err := s.claimSolver.AttemptStep(ctx, claim, game.AgreeWithClaimLevel(claim))
+	if err != nil {
+		return nil, err
+	}
+	return &Action{
+		Type:       ActionTypeStep,
+		ParentIdx:  step.LeafClaim.ContractIndex,
+		IsAttack:   step.IsAttack,
+		PreState:   step.PreState,
+		ProofData:  step.ProofData,
+		OracleData: step.OracleData,
+	}, nil
+}
+
+func (s *GameSolver) calculateMove(ctx context.Context, game types.Game, claim types.Claim) (*Action, error) {
+	move, err := s.claimSolver.NextMove(ctx, claim, game.AgreeWithClaimLevel(claim))
+	if err != nil {
+		return nil, fmt.Errorf("failed to calculate next move for claim index %v: %w", claim.ContractIndex, err)
+	}
+	if move == nil || game.IsDuplicate(*move) {
+		return nil, nil
+	}
+	return &Action{
+		Type:      ActionTypeMove,
+		IsAttack:  !move.DefendsParent(),
+		ParentIdx: move.ParentContractIndex,
+		Value:     move.Value,
+	}, nil
+}

op-challenger/game/fault/solver/game_solver_test.go

+package solver
+
+import (
+	"context"
+	"encoding/hex"
+	"testing"
+
+	faulttest "github.com/ethereum-optimism/optimism/op-challenger/game/fault/test"
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/stretchr/testify/require"
+)
+
+type actionMaker func(game types.Game) Action
+
+func TestCalculateNextActions(t *testing.T) {
+	maxDepth := 4
+	claimBuilder := faulttest.NewAlphabetClaimBuilder(t, maxDepth)
+
+	attackClaim := func(parentIdx int) actionMaker {
+		return func(game types.Game) Action {
+			parentClaim := game.Claims()[parentIdx]
+			return Action{
+				Type:      ActionTypeMove,
+				ParentIdx: parentIdx,
+				IsAttack:  true,
+				Value:     claimBuilder.CorrectClaimAtPosition(parentClaim.Position.Attack()),
+			}
+		}
+	}
+	defendClaim := func(parentIdx int) actionMaker {
+		return func(game types.Game) Action {
+			parentClaim := game.Claims()[parentIdx]
+			return Action{
+				Type:      ActionTypeMove,
+				ParentIdx: parentIdx,
+				IsAttack:  false,
+				Value:     claimBuilder.CorrectClaimAtPosition(parentClaim.Position.Defend()),
+			}
+		}
+	}
+	stepAttack := func(parentIdx int) actionMaker {
+		return func(game types.Game) Action {
+			parentClaim := game.Claims()[parentIdx]
+			traceIdx := parentClaim.Position.TraceIndex(maxDepth)
+			return Action{
+				Type:       ActionTypeStep,
+				ParentIdx:  parentIdx,
+				IsAttack:   true,
+				PreState:   claimBuilder.CorrectPreState(traceIdx),
+				ProofData:  claimBuilder.CorrectProofData(traceIdx),
+				OracleData: claimBuilder.CorrectOracleData(traceIdx),
+			}
+		}
+	}
+	stepDefend := func(parentIdx int) actionMaker {
+		return func(game types.Game) Action {
+			parentClaim := game.Claims()[parentIdx]
+			traceIdx := parentClaim.Position.TraceIndex(maxDepth) + 1
+			return Action{
+				Type:       ActionTypeStep,
+				ParentIdx:  parentIdx,
+				IsAttack:   false,
+				PreState:   claimBuilder.CorrectPreState(traceIdx),
+				ProofData:  claimBuilder.CorrectProofData(traceIdx),
+				OracleData: claimBuilder.CorrectOracleData(traceIdx),
+			}
+		}
+	}
+
+	tests := []struct {
+		name                string
+		agreeWithOutputRoot bool
+		rootClaimCorrect    bool
+		setupGame           func(builder *faulttest.GameBuilder)
+		expectedActions     []actionMaker
+	}{
+		{
+			name:                "AttackRootClaim",
+			agreeWithOutputRoot: true,
+			setupGame:           func(builder *faulttest.GameBuilder) {},
+			expectedActions: []actionMaker{
+				attackClaim(0),
+			},
+		},
+		{
+			name:                "DoNotAttackRootClaimWhenDisagreeWithOutputRoot",
+			agreeWithOutputRoot: false,
+			setupGame:           func(builder *faulttest.GameBuilder) {},
+			expectedActions:     nil,
+		},
+		{
+			// Note: The fault dispute game contract should prevent a correct root claim from actually being posted
+			// But for completeness, test we ignore it so we don't get sucked into playing an unwinnable game.
+			name:                "DoNotAttackCorrectRootClaim_AgreeWithOutputRoot",
+			agreeWithOutputRoot: true,
+			rootClaimCorrect:    true,
+			setupGame:           func(builder *faulttest.GameBuilder) {},
+			expectedActions:     nil,
+		},
+		{
+			// Note: The fault dispute game contract should prevent a correct root claim from actually being posted
+			// But for completeness, test we ignore it so we don't get sucked into playing an unwinnable game.
+			name:                "DoNotAttackCorrectRootClaim_DisagreeWithOutputRoot",
+			agreeWithOutputRoot: false,
+			rootClaimCorrect:    true,
+			setupGame:           func(builder *faulttest.GameBuilder) {},
+			expectedActions:     nil,
+		},
+
+		{
+			name:                "DoNotPerformDuplicateMoves",
+			agreeWithOutputRoot: true,
+			setupGame: func(builder *faulttest.GameBuilder) {
+				// Expected move has already been made.
+				builder.Seq().AttackCorrect()
+			},
+			expectedActions: nil,
+		},
+
+		{
+			name:                "RespondToAllClaimsAtDisagreeingLevel",
+			agreeWithOutputRoot: true,
+			setupGame: func(builder *faulttest.GameBuilder) {
+				honestClaim := builder.Seq().AttackCorrect() // 1
+				honestClaim.AttackCorrect()                  // 2
+				honestClaim.DefendCorrect()                  // 3
+				honestClaim.Attack(common.Hash{0xaa})        // 4
+				honestClaim.Attack(common.Hash{0xbb})        // 5
+				honestClaim.Defend(common.Hash{0xcc})        // 6
+				honestClaim.Defend(common.Hash{0xdd})        // 7
+			},
+			expectedActions: []actionMaker{
+				// Defend the correct claims
+				defendClaim(2),
+				defendClaim(3),
+
+				// Attack the incorrect claims
+				attackClaim(4),
+				attackClaim(5),
+				attackClaim(6),
+				attackClaim(7),
+			},
+		},
+
+		{
+			name:                "StepAtMaxDepth",
+			agreeWithOutputRoot: true,
+			setupGame: func(builder *faulttest.GameBuilder) {
+				lastHonestClaim := builder.Seq().
+					AttackCorrect(). // 1 - Honest
+					AttackCorrect(). // 2 - Dishonest
+					DefendCorrect()  // 3 - Honest
+				lastHonestClaim.AttackCorrect()           // 4 - Dishonest
+				lastHonestClaim.Attack(common.Hash{0xdd}) // 5 - Dishonest
+			},
+			expectedActions: []actionMaker{
+				stepDefend(4),
+				stepAttack(5),
+			},
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			builder := claimBuilder.GameBuilder(test.agreeWithOutputRoot, test.rootClaimCorrect)
+			test.setupGame(builder)
+			game := builder.Game
+			for i, claim := range game.Claims() {
+				t.Logf("Claim %v: Pos: %v ParentIdx: %v, Countered: %v, Value: %v", i, claim.Position.ToGIndex(), claim.ParentContractIndex, claim.Countered, claim.Value)
+			}
+
+			solver := NewGameSolver(maxDepth, claimBuilder.CorrectTraceProvider())
+			actions, err := solver.CalculateNextActions(context.Background(), game)
+			require.NoError(t, err)
+			for i, action := range actions {
+				t.Logf("Move %v: Type: %v, ParentIdx: %v, Attack: %v, Value: %v, PreState: %v, ProofData: %v",
+					i, action.Type, action.ParentIdx, action.IsAttack, action.Value, hex.EncodeToString(action.PreState), hex.EncodeToString(action.ProofData))
+			}
+			require.Len(t, actions, len(test.expectedActions))
+			for i, action := range test.expectedActions {
+				require.Containsf(t, actions, action(game), "Expected claim %v missing", i)
+			}
+		})
+	}
+}

op-challenger/game/fault/solver/solver.go

@@ -15,22 +15,22 @@ var (
 	ErrStepAgreedClaim = errors.New("cannot step on claims we agree with")
 )
 
-// Solver uses a [TraceProvider] to determine the moves to make in a dispute game.
-type Solver struct {
+// claimSolver uses a [TraceProvider] to determine the moves to make in a dispute game.
+type claimSolver struct {
 	trace     types.TraceProvider
 	gameDepth int
 }
 
-// NewSolver creates a new [Solver] using the provided [TraceProvider].
-func NewSolver(gameDepth int, traceProvider types.TraceProvider) *Solver {
-	return &Solver{
+// newClaimSolver creates a new [claimSolver] using the provided [TraceProvider].
+func newClaimSolver(gameDepth int, traceProvider types.TraceProvider) *claimSolver {
+	return &claimSolver{
 		traceProvider,
 		gameDepth,
 	}
 }
 
 // NextMove returns the next move to make given the current state of the game.
-func (s *Solver) NextMove(ctx context.Context, claim types.Claim, agreeWithClaimLevel bool) (*types.Claim, error) {
+func (s *claimSolver) NextMove(ctx context.Context, claim types.Claim, agreeWithClaimLevel bool) (*types.Claim, error) {
 	if agreeWithClaimLevel {
 		return nil, nil
 	}
@@ -58,7 +58,7 @@ type StepData struct {
 
 // AttemptStep determines what step should occur for a given leaf claim.
 // An error will be returned if the claim is not at the max depth.
-func (s *Solver) AttemptStep(ctx context.Context, claim types.Claim, agreeWithClaimLevel bool) (StepData, error) {
+func (s *claimSolver) AttemptStep(ctx context.Context, claim types.Claim, agreeWithClaimLevel bool) (StepData, error) {
 	if claim.Depth() != s.gameDepth {
 		return StepData{}, ErrStepNonLeafNode
 	}
@@ -100,7 +100,7 @@ func (s *Solver) AttemptStep(ctx context.Context, claim types.Claim, agreeWithCl
 }
 
 // attack returns a response that attacks the claim.
-func (s *Solver) attack(ctx context.Context, claim types.Claim) (*types.Claim, error) {
+func (s *claimSolver) attack(ctx context.Context, claim types.Claim) (*types.Claim, error) {
 	position := claim.Attack()
 	value, err := s.traceAtPosition(ctx, position)
 	if err != nil {
@@ -114,7 +114,7 @@ func (s *Solver) attack(ctx context.Context, claim types.Claim) (*types.Claim, e
 }
 
 // defend returns a response that defends the claim.
-func (s *Solver) defend(ctx context.Context, claim types.Claim) (*types.Claim, error) {
+func (s *claimSolver) defend(ctx context.Context, claim types.Claim) (*types.Claim, error) {
 	if claim.IsRoot() {
 		return nil, nil
 	}
@@ -131,13 +131,13 @@ func (s *Solver) defend(ctx context.Context, claim types.Claim) (*types.Claim, e
 }
 
 // agreeWithClaim returns true if the claim is correct according to the internal [TraceProvider].
-func (s *Solver) agreeWithClaim(ctx context.Context, claim types.ClaimData) (bool, error) {
+func (s *claimSolver) agreeWithClaim(ctx context.Context, claim types.ClaimData) (bool, error) {
 	ourValue, err := s.traceAtPosition(ctx, claim.Position)
 	return bytes.Equal(ourValue[:], claim.Value[:]), err
 }
 
 // traceAtPosition returns the [common.Hash] from internal [TraceProvider] at the given [Position].
-func (s *Solver) traceAtPosition(ctx context.Context, p types.Position) (common.Hash, error) {
+func (s *claimSolver) traceAtPosition(ctx context.Context, p types.Position) (common.Hash, error) {
 	index := p.TraceIndex(s.gameDepth)
 	hash, err := s.trace.Get(ctx, index)
 	return hash, err

op-challenger/game/fault/solver/solver_test.go

-package solver_test
+package solver
 
 import (
 	"context"
 	"errors"
 	"testing"
 
-	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/solver"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/test"
 	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
 	"github.com/stretchr/testify/require"
@@ -84,7 +83,7 @@ func TestNextMove(t *testing.T) {
 	for _, test := range tests {
 		test := test
 		t.Run(test.name, func(t *testing.T) {
-			solver := solver.NewSolver(maxDepth, builder.CorrectTraceProvider())
+			solver := newClaimSolver(maxDepth, builder.CorrectTraceProvider())
 			move, err := solver.NextMove(context.Background(), test.claim, test.agreeWithLevel)
 			if test.expectedErr == nil {
 				require.NoError(t, err)
@@ -174,19 +173,19 @@ func TestAttemptStep(t *testing.T) {
 		{
 			name:        "CannotStepNonLeaf",
 			claim:       builder.Seq(false).Attack(false).Get(),
-			expectedErr: solver.ErrStepNonLeafNode,
+			expectedErr: ErrStepNonLeafNode,
 		},
 		{
 			name:           "CannotStepAgreedNode",
 			claim:          builder.Seq(false).Attack(false).Get(),
 			agreeWithLevel: true,
-			expectedErr:    solver.ErrStepNonLeafNode,
+			expectedErr:    ErrStepNonLeafNode,
 		},
 		{
 			name:           "CannotStepAgreedNode",
 			claim:          builder.Seq(false).Attack(false).Get(),
 			agreeWithLevel: true,
-			expectedErr:    solver.ErrStepNonLeafNode,
+			expectedErr:    ErrStepNonLeafNode,
 		},
 	}
 
@@ -198,7 +197,7 @@ func TestAttemptStep(t *testing.T) {
 				alphabetProvider = test.NewAlphabetWithProofProvider(t, maxDepth, errProvider)
 			}
 			builder = test.NewClaimBuilder(t, maxDepth, alphabetProvider)
-			alphabetSolver := solver.NewSolver(maxDepth, builder.CorrectTraceProvider())
+			alphabetSolver := newClaimSolver(maxDepth, builder.CorrectTraceProvider())
 			step, err := alphabetSolver.AttemptStep(ctx, tableTest.claim, tableTest.agreeWithLevel)
 			if tableTest.expectedErr == nil {
 				require.NoError(t, err)
@@ -212,7 +211,7 @@ func TestAttemptStep(t *testing.T) {
 				require.Equal(t, tableTest.expectedOracleData.OracleOffset, step.OracleData.OracleOffset)
 			} else {
 				require.ErrorIs(t, err, tableTest.expectedErr)
-				require.Equal(t, solver.StepData{}, step)
+				require.Equal(t, StepData{}, step)
 			}
 		})
 	}

op-challenger/game/fault/test/claim_builder.go

@@ -38,6 +38,13 @@ func (c *ClaimBuilder) CorrectClaim(idx uint64) common.Hash {
 	return value
 }
 
+// CorrectClaimAtPosition returns the canonical claim at a specified position
+func (c *ClaimBuilder) CorrectClaimAtPosition(pos types.Position) common.Hash {
+	value, err := c.correct.Get(context.Background(), pos.TraceIndex(c.maxDepth))
+	c.require.NoError(err)
+	return value
+}
+
 // CorrectPreState returns the pre-state (not hashed) required to execute the valid step at the specified trace index
 func (c *ClaimBuilder) CorrectPreState(idx uint64) []byte {
 	preimage, _, _, err := c.correct.GetStepData(context.Background(), idx)
@@ -102,7 +109,20 @@ func (c *ClaimBuilder) AttackClaim(claim types.Claim, correct bool) types.Claim
 			Value:    c.claim(pos.TraceIndex(c.maxDepth), correct),
 			Position: pos,
 		},
-		Parent: claim.ClaimData,
+		Parent:              claim.ClaimData,
+		ParentContractIndex: claim.ContractIndex,
+	}
+}
+
+func (c *ClaimBuilder) AttackClaimWithValue(claim types.Claim, value common.Hash) types.Claim {
+	pos := claim.Position.Attack()
+	return types.Claim{
+		ClaimData: types.ClaimData{
+			Value:    value,
+			Position: pos,
+		},
+		Parent:              claim.ClaimData,
+		ParentContractIndex: claim.ContractIndex,
 	}
 }
 
@@ -113,6 +133,19 @@ func (c *ClaimBuilder) DefendClaim(claim types.Claim, correct bool) types.Claim
 			Value:    c.claim(pos.TraceIndex(c.maxDepth), correct),
 			Position: pos,
 		},
-		Parent: claim.ClaimData,
+		Parent:              claim.ClaimData,
+		ParentContractIndex: claim.ContractIndex,
+	}
+}
+
+func (c *ClaimBuilder) DefendClaimWithValue(claim types.Claim, value common.Hash) types.Claim {
+	pos := claim.Position.Defend()
+	return types.Claim{
+		ClaimData: types.ClaimData{
+			Value:    value,
+			Position: pos,
+		},
+		Parent:              claim.ClaimData,
+		ParentContractIndex: claim.ContractIndex,
 	}
 }

op-challenger/game/fault/test/game_builder.go

+package test
+
+import (
+	"github.com/ethereum-optimism/optimism/op-challenger/game/fault/types"
+	"github.com/ethereum/go-ethereum/common"
+)
+
+type GameBuilder struct {
+	builder *ClaimBuilder
+	Game    types.Game
+}
+
+func (c *ClaimBuilder) GameBuilder(agreeWithOutputRoot bool, rootCorrect bool) *GameBuilder {
+	return &GameBuilder{
+		builder: c,
+		Game:    types.NewGameState(agreeWithOutputRoot, c.CreateRootClaim(rootCorrect), uint64(c.maxDepth)),
+	}
+}
+
+type GameBuilderSeq struct {
+	builder   *ClaimBuilder
+	lastClaim types.Claim
+	game      types.Game
+}
+
+func (g *GameBuilder) Seq() *GameBuilderSeq {
+	return &GameBuilderSeq{
+		builder:   g.builder,
+		game:      g.Game,
+		lastClaim: g.Game.Claims()[0],
+	}
+}
+
+func (s *GameBuilderSeq) AttackCorrect() *GameBuilderSeq {
+	claim := s.builder.AttackClaim(s.lastClaim, true)
+	claim.ContractIndex = len(s.game.Claims())
+	s.builder.require.NoError(s.game.Put(claim))
+	return &GameBuilderSeq{
+		builder:   s.builder,
+		game:      s.game,
+		lastClaim: claim,
+	}
+}
+
+func (s *GameBuilderSeq) Attack(value common.Hash) *GameBuilderSeq {
+	claim := s.builder.AttackClaimWithValue(s.lastClaim, value)
+	claim.ContractIndex = len(s.game.Claims())
+	s.builder.require.NoError(s.game.Put(claim))
+	return &GameBuilderSeq{
+		builder:   s.builder,
+		game:      s.game,
+		lastClaim: claim,
+	}
+}
+
+func (s *GameBuilderSeq) DefendCorrect() *GameBuilderSeq {
+	claim := s.builder.DefendClaim(s.lastClaim, true)
+	claim.ContractIndex = len(s.game.Claims())
+	s.builder.require.NoError(s.game.Put(claim))
+	return &GameBuilderSeq{
+		builder:   s.builder,
+		game:      s.game,
+		lastClaim: claim,
+	}
+}
+
+func (s *GameBuilderSeq) Defend(value common.Hash) *GameBuilderSeq {
+	claim := s.builder.DefendClaimWithValue(s.lastClaim, value)
+	claim.ContractIndex = len(s.game.Claims())
+	s.builder.require.NoError(s.game.Put(claim))
+	return &GameBuilderSeq{
+		builder:   s.builder,
+		game:      s.game,
+		lastClaim: claim,
+	}
+}

op-challenger/scripts/alphabet/init_game.sh

@@ -62,5 +62,7 @@ done
 # Root claim commits to the entire trace.
 # Alphabet game claim construction: keccak256(abi.encode(trace_index, trace[trace_index]))
 ROOT_CLAIM=$(cast keccak $(cast abi-encode "f(uint256,uint256)" 15 122))
+# Replace the first byte of the claim with the invalid vm status indicator
+ROOT_CLAIM="0x01${ROOT_CLAIM:4:60}"
 
 GAME_TYPE=255 ${SOURCE_DIR}/../create_game.sh http://localhost:8545 "${DISPUTE_GAME_FACTORY}" "${ROOT_CLAIM}" --private-key "${DEVNET_SPONSOR}"

pnpm-lock.yaml

@@ -943,7 +943,7 @@ packages:
       p-limit: 2.3.0
       preferred-pm: 3.0.3
       resolve-from: 5.0.0
-      semver: 5.7.1
+      semver: 5.7.2
       spawndamnit: 2.0.0
       term-size: 2.2.1
       tty-table: 4.1.6
@@ -6846,7 +6846,7 @@ packages:
       resolve: 1.22.2
       sass: 1.52.1
       scss-parser: 1.0.5
-      semver: 7.5.3
+      semver: 7.5.4
       yargs: 16.2.0
     transitivePeerDependencies:
       - supports-color
@@ -7668,7 +7668,7 @@ packages:
       jsdoc-type-pratt-parser: 1.1.1
       lodash: 4.17.21
       regextras: 0.8.0
-      semver: 7.5.3
+      semver: 7.5.4
       spdx-expression-parse: 3.0.1
     transitivePeerDependencies:
       - supports-color
@@ -7686,7 +7686,7 @@ packages:
       ignore: 5.2.4
       minimatch: 3.1.2
       resolve: 1.22.2
-      semver: 6.3.0
+      semver: 6.3.1
     dev: true
 
   /eslint-plugin-prefer-arrow@1.2.3(eslint@8.47.0):
@@ -7767,7 +7767,7 @@ packages:
       read-pkg-up: 7.0.1
       regexp-tree: 0.1.24
       safe-regex: 2.1.1
-      semver: 7.5.3
+      semver: 7.5.4
       strip-indent: 3.0.0
     dev: true
 
@@ -12176,7 +12176,7 @@ packages:
       emoji-regex: 9.2.2
       escape-string-regexp: 4.0.0
       prettier: 2.8.8
-      semver: 7.5.3
+      semver: 7.5.4
       solidity-comments-extractor: 0.0.7
       string-width: 4.2.3
     dev: true
@@ -12961,20 +12961,10 @@ packages:
     resolution: {integrity: sha512-YM3/ITh2MJ5MtzaM429anh+x2jiLVjqILF4m4oyQB18W7Ggea7BfqdH/wGMK7dDiMghv/6WG7znWMwUDzJiXow==}
     dev: true
 
-  /semver@5.7.1:
-    resolution: {integrity: sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==}
-    hasBin: true
-    dev: false
-
   /semver@5.7.2:
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specs/README.md

@@ -29,8 +29,9 @@ that maintains 1:1 compatibility with Ethereum.
 Specifications of new features in active development.
 
 - [Fault Proof](./fault-proof.md)
-- [Dispute Game](./dispute-game.md)
 - [Dispute Game Interface](./dispute-game-interface.md)
+- [Fault Dispute Game](./fault-dispute-game.md)
+- [Cannon VM](./cannon-fault-proof-vm.md)
 
 ## Design Goals
 

specs/bond-manager.md

@@ -20,14 +20,14 @@ be attached to an output proposal. In this case, the bond will be paid in ether.
 
 By requiring a bond to be posted with an output proposal, spam and invalid outputs
 are disincentivized. Explicitly, if invalid outputs are proposed, challenge agents
-can delete the invalid output via a [dispute-game](./dispute-game.md) and seize the
+can delete the invalid output via a [dispute-game](./dispute-game-interface.md) and seize the
 proposer's bond. So, posting invalid outputs is directly disincentivized in this way
 since the proposer would lose their bond if the challenge agents seize it.
 
 Concretely, outputs will be permissionlessly proposed to the `L2OutputOracle` contract.
 When submitting an output proposal, the ether value is sent as the bond. This bond is
 then held by a bond manager contract. The bond manager contract is responsible for
-both the [dispute-games](./dispute-game.md) and the `L2OutputOracle` (further detailed
+both the [dispute-games](./dispute-game-interface.md) and the `L2OutputOracle` (further detailed
 in [proposals](./proposals.md)).
 
 The bond manager will need to handle bond logic for a variety of different
@@ -136,7 +136,7 @@ instead tied to the address of the output proposer.
 ## Bond Manager Implementation
 
 Initially, the bond manager will only be used by the `L2OutputOracle` contract
-for output proposals in the attestation [dispute game](./dispute-game.md). Since
+for output proposals in the attestation [dispute game](./dispute-game-interface.md). Since
 the attestation dispute game has a permissioned set of attestors, there are no
 intermediate steps in the game that would require bonds.
 

specs/challenger.md

-# Challenger Specification
-
-<!-- START doctoc generated TOC please keep comment here to allow auto update -->
-<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-**Table of Contents**
-
-- [Description](#description)
-- [Terminology](#terminology)
-- [Event and Response Lifecycle](#event-and-response-lifecycle)
-  - [`GameType.FAULT`](#gametypefault)
-  - [`GameType.ATTESTATION`](#gametypeattestation)
-  - [`GameType.VALIDITY`](#gametypevalidity)
-
-<!-- END doctoc generated TOC please keep comment here to allow auto update -->
-
-## Description
-
-The Challenger is an off-chain agent that listens for faulty claims made about the state of
-the L2 on the data availability layer. It is responsible for challenging these incorrect claims
-and ensuring the correctness of all finalized claims on the settlement layer.
-
-The Challenger agent is intended to be ran as a permissionless service by participants of the network
-alongside a [rollup-node](./rollup-node.md). Challenger agents will be rewarded in the form of the
-bond attached to the claims they disprove.
-
-## Terminology
-
-- **data availability layer** - In the context of this document, the data availability layer is the
-  generic term for the location where claims about the state of the layer two are made. In the context
-  of Optimism, this is Ethereum Mainnet.
-- **settlement layer** - In the context of this document, the settlement layer is the location of the
-  bridge as well as where funds deposited to the rollup reside. In the context of Optimism, this is
-  Ethereum Mainnet.
-- **L2** - In the context of this document, the layer two of the Optimistic Rollup. In the context
-  of Optimism, this is the Optimism Mainnet.
-- **rollup-node** - In the context of this document, the rollup node describes the
-  [rollup-node specification](./rollup-node.md). In the context of Optimism, this is the implementation
-  of the [rollup-node specification](./rollup-node.md), the `op-node`.
-
-## Event and Response Lifecycle
-
-The Challenger agent is expected to be able to listen for and respond to several different events
-on the data availability layer. These events and responses are parameterized depending on the type
-of dispute game being played, and the Challenger listens to different events and responds uniquely
-to each of the different game types. For specification of dispute game types, see the
-[Dispute Game Interfaces specification](./dispute-game-interface.md) and
-[Dispute Game specification](./dispute-game.md).
-
-### `GameType.FAULT`
-
-> **Warning**
-> The `FAULT` game type is not yet implemented. In the first iteration of Optimism's decentralization effort,
-> challengers will respond to `ATTESTATION` games only.
-
-**Events and Responses**
-*TODO*
-
-### `GameType.ATTESTATION`
-
-**Events and Responses**
-
-- [`L2OutputOracle.OutputProposed`](../packages/contracts-bedrock/src/L1/L2OutputOracle.sol#L57-70)
-  The `L2OutputOracle` contract emits this event when a new output is proposed on the data availability
-  layer. Each time an output is proposed, the Challenger should check to see if the output is equal
-  the output given by the `optimism_outputAtBlock` endpoint of their `rollup-node`.
-  - If it is, the Challenger should do nothing to challenge this output proposal.
-  - If it is not, the Challenger should respond by creating a new `DisputeGame` with the
-    `DisputeGameType.ATTESTATION` `gameType`, the correct output root as the `rootClaim`, and the abi-encoded
-    `l2BlockNumber` of the correct output root as the `extraData`.
-  ![Attestation `OutputProposed` Diagram](./assets/challenger_attestation_output_proposed.png)
-- `DisputeGameFactory.DisputeGameCreated` A new dispute game has been created and is ready to be reviewed. The
-  Challenger agent should listen for this event and check if the `rootClaim` of the `AttestationDisputeGame`
-  created by the `DisputeGameFactory` is equal to the output root of their `rollup-node` at the game's `l2BlockNumber`.
-  - If it is, the Challenger should sign the [EIP-712 typeHash](./dispute-game.md) of the struct containing the
-    `AttestationDisputeGame`'s `rootClaim` and `l2BlockNumber`. The Challenger should then submit the abi-encoded
-    signature to the `AttestationDisputeGame`'s `challenge` function.
-  - If it is not, the Challenger should do nothing in support of this dispute game.
-  ![Attestation `DisputeGameCreated` Diagram](./assets/challenger_attestation_dispute_game_created.png)
-
-A full diagram and lifecycle of the Challenger's role in the `ATTESTATION` game type can be found below:
-
-![Attestation Diagram](./assets/challenger_attestation.png)
-
-### `GameType.VALIDITY`
-
-**TODO**
-
-> **Warning**
-> The `VALIDITY` game type is not yet implemented. In the first iteration of Optimism's decentralization effort,
-> challengers will respond to `ATTESTATION` games only. A validity proof based dispute game is a possibility,
-> but fault proof based dispute games will be the primary focus of the team in the near future.
-
-**Events and Responses**
-*TODO*

specs/dispute-game.md

-# Dispute Game
-
-<!-- START doctoc generated TOC please keep comment here to allow auto update -->
-<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-**Table of Contents**
-
-- [Attestation Dispute Game](#attestation-dispute-game)
-  - [Smart Contract Implementation](#smart-contract-implementation)
-    - [Attestation Structure](#attestation-structure)
-  - [Why EIP-712](#why-eip-712)
-
-<!-- END doctoc generated TOC please keep comment here to allow auto update -->
-
-## Attestation Dispute Game
-
-The output attestation based dispute game shifts the current permissioned output proposal process
-to a permissionless, social-consensus based architecture that can progressively decentralize over
-time by increasing the size of the signer set. In this "game," output proposals can be submitted
-permissionlessly. To prevent "invalid output proposals," a social quorum can revert an output proposal
-when an invalid one is discovered. The set of signers is maintained in the `SystemConfig` contract,
-and these signers will issue [EIP-712](https://eips.ethereum.org/EIPS/eip-712) signatures
-over canonical output roots and the `l2BlockNumber`s they commit to as attestations. To learn more,
-see the [DisputeGame Interface Spec](./dispute-game-interface.md).
-
-In the above language, an "invalid output proposal" is defined as an output proposal that represents
-a non-canonical state of the L2 chain.
-
-### Smart Contract Implementation
-
-The `AttestationDisputeGame` should implement the `IDisputeGame` interface and also be able to call
-out to the `L2OutputOracle`. It is expected that the `L2OutputOracle` will grant permissions to
-`AttestationDisputeGame` contracts to call its `deleteL2Outputs` function at the *specific* `l2BlockNumber`
-that is embedded in the `AttestationDisputeGame`'s `extraData`.
-
-The `AttestationDisputeGame` should be configured with a quorum ratio at deploy time. It should also
-maintain a set of attestor accounts, which is fetched by the `SystemConfig` contract and snapshotted
-at deploy time. This snapshot is necessary to have a fixed upper bound on resolution cost, which in
-turn gives a fix cost for the necessary bond attached to output proposals.
-
-The ability to add and remove attestor accounts should be enabled by a single immutable
-account that controls the `SystemConfig`. It should be impossible to remove accounts such that quorum
-is not able to be reached. It is ok to allow accounts to be added or removed in the middle of an
-open challenge, as it will not affect the `signerSet` that exists within open challenges.
-
-A challenge is created when an alternative output root for a given `l2BlockNumber` is presented to the
-`DisputeGameFactory` contract. Multiple challenges should be able to run in parallel.
-
-For simplicity, the `AttestationDisputeGame` does not need to track what output proposals are
-committed to as part of the attestations. It only needs to check that the attested output root
-is different than the proposed output root. If this is not checked, then it will be possible
-to remove output proposals that are in agreement with the attestations and create a griefing vector.
-
-#### Attestation Structure
-
-The EIP-712 [typeHash](https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash) should be
-defined as the following:
-
-```solidity
-TYPE_HASH = keccak256("Dispute(bytes32 outputRoot,uint256 l2BlockNumber)");
-```
-
-The components for the `typeHash` are as follows:
-
-- `outputRoot` - The **correct** output root that commits to the given `l2BlockNumber`. This should be a
-  positive attestation where the `rootClaim` of the `AttestationDisputeGame` is the **correct** output root
-  for the given `l2BlockNumber`.
-- `l2BlockNumber` - The L2 block number that the `outputRoot` commits to. The `outputRoot` should commit
-  to the entirety of the L2 state from genesis up to and including this `l2BlockNumber`.
-
-### Why EIP-712
-
-It is important to use EIP-712 to decouple the originator of the transaction and the attestor. This
-will allow a decentralized network of attestors that serve attestations to bots that are responsible
-for ensuring that all output proposals submitted to the network will not allow for malicious withdrawals
-from the bridge.
-
-It is important to have replay protection to ensure that attestations cannot be used more than once.

specs/fault-proof.md

@@ -412,5 +412,5 @@ The allocated response time is limited by the dispute-game window,
 and any additional time necessary based on L1 fee changes when bonds are insufficient.
 
 > Note: the timed, bonded, bisection dispute game is in development.
-> Also see [dispute-game specs](./dispute-game.md) for general dispute game system specifications,
+> Also see [fault dispute-game specs](./fault-dispute-game.md) for fault dispute game system specifications,
 > And [dispute-game-interface specs](./dispute-game-interface.md) for dispute game interface specifications.