feat(sender): support web3signer (#1524)

common/testcontainers/testcontainers.go

@@ -21,9 +21,10 @@ import (
 
 // TestcontainerApps testcontainers struct
 type TestcontainerApps struct {
-	postgresContainer *postgres.PostgresContainer
-	l2GethContainer   *testcontainers.DockerContainer
-	poSL1Container    compose.ComposeStack
+	postgresContainer   *postgres.PostgresContainer
+	l2GethContainer     *testcontainers.DockerContainer
+	poSL1Container      compose.ComposeStack
+	web3SignerContainer *testcontainers.DockerContainer
 
 	// common time stamp in nanoseconds.
 	Timestamp int
@@ -112,6 +113,47 @@ func (t *TestcontainerApps) StartPoSL1Container() error {
 	return nil
 }
 
+func (t *TestcontainerApps) StartWeb3SignerContainer(chainId int) error {
+	if t.web3SignerContainer != nil && t.web3SignerContainer.IsRunning() {
+		return nil
+	}
+	var (
+		err     error
+		rootDir string
+	)
+	if rootDir, err = findProjectRootDir(); err != nil {
+		return fmt.Errorf("failed to find project root directory: %v", err)
+	}
+
+	// web3signerconf/keyconf.yaml may contain multiple keys configured and web3signer then choses one corresponding to from field of tx
+	web3SignerConfDir := filepath.Join(rootDir, "common", "testcontainers", "web3signerconf")
+
+	req := testcontainers.ContainerRequest{
+		Image:        "consensys/web3signer:develop",
+		ExposedPorts: []string{"9000/tcp"},
+		Cmd:          []string{"--key-config-path", "/web3signerconf/", "eth1", "--chain-id", fmt.Sprintf("%d", chainId)},
+		Files: []testcontainers.ContainerFile{
+			{
+				HostFilePath:      web3SignerConfDir,
+				ContainerFilePath: "/",
+				FileMode:          0o777,
+			},
+		},
+		WaitingFor: wait.ForLog("ready to handle signing requests"),
+	}
+	genericContainerReq := testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	}
+	container, err := testcontainers.GenericContainer(context.Background(), genericContainerReq)
+	if err != nil {
+		log.Printf("failed to start web3signer container: %s", err)
+		return err
+	}
+	t.web3SignerContainer, _ = container.(*testcontainers.DockerContainer)
+	return nil
+}
+
 // GetPoSL1EndPoint returns the endpoint of the running PoS L1 endpoint
 func (t *TestcontainerApps) GetPoSL1EndPoint() (string, error) {
 	if t.poSL1Container == nil {
@@ -153,6 +195,14 @@ func (t *TestcontainerApps) GetL2GethEndPoint() (string, error) {
 	return endpoint, nil
 }
 
+// GetL2GethEndPoint returns the endpoint of the running L2Geth container
+func (t *TestcontainerApps) GetWeb3SignerEndpoint() (string, error) {
+	if t.web3SignerContainer == nil || !t.web3SignerContainer.IsRunning() {
+		return "", errors.New("web3signer is not running")
+	}
+	return t.web3SignerContainer.PortEndpoint(context.Background(), "9000/tcp", "http")
+}
+
 // GetGormDBClient returns a gorm.DB by connecting to the running postgres container
 func (t *TestcontainerApps) GetGormDBClient() (*gorm.DB, error) {
 	endpoint, err := t.GetDBEndPoint()
@@ -201,6 +251,11 @@ func (t *TestcontainerApps) Free() {
 			t.poSL1Container = nil
 		}
 	}
+	if t.web3SignerContainer != nil && t.web3SignerContainer.IsRunning() {
+		if err := t.web3SignerContainer.Terminate(ctx); err != nil {
+			log.Printf("failed to stop web3signer container: %s", err)
+		}
+	}
 }
 
 // findProjectRootDir find project root directory

common/testcontainers/testcontainers_test.go

@@ -44,6 +44,11 @@ func TestNewTestcontainerApps(t *testing.T) {
 	assert.NoError(t, err)
 	assert.NotNil(t, ethclient)
 
+	assert.NoError(t, testApps.StartWeb3SignerContainer(1))
+	endpoint, err = testApps.GetWeb3SignerEndpoint()
+	assert.NoError(t, err)
+	assert.NotEmpty(t, endpoint)
+
 	// test free testcontainers
 	testApps.Free()
 	endpoint, err = testApps.GetDBEndPoint()
@@ -57,4 +62,8 @@ func TestNewTestcontainerApps(t *testing.T) {
 	endpoint, err = testApps.GetPoSL1EndPoint()
 	assert.EqualError(t, err, "PoS L1 container is not running")
 	assert.Empty(t, endpoint)
+
+	endpoint, err = testApps.GetWeb3SignerEndpoint()
+	assert.EqualError(t, err, "web3signer is not running")
+	assert.Empty(t, endpoint)
 }

common/testcontainers/web3signerconf/keyconf.yaml

@@ -0,0 +1,7 @@
+type: "file-raw"
+keyType: "SECP256K1"
+privateKey: "0x1313131313131313131313131313131313131313131313131313131313131313"
+---
+type: "file-raw"
+keyType: "SECP256K1"
+privateKey: "0x1212121212121212121212121212121212121212121212121212121212121212"

common/version/version.go

@@ -5,7 +5,7 @@ import (
 	"runtime/debug"
 )
 
-var tag = "v4.4.63"
+var tag = "v4.4.64"
 
 var commit = func() string {
 	if info, ok := debug.ReadBuildInfo(); ok {

rollup/conf/config.json

@@ -24,7 +24,12 @@
         "l1_base_fee_default": 15000000000,
         "l1_blob_base_fee_default": 1
       },
-      "gas_oracle_sender_private_key": "1313131313131313131313131313131313131313131313131313131313131313"
+      "gas_oracle_sender_signer_config": {
+        "signer_type": "PrivateKey",
+        "private_key_signer_config": {
+          "private_key": "1313131313131313131313131313131313131313131313131313131313131313"
+        }
+      }
     }
   },
   "l2_config": {
@@ -60,9 +65,24 @@
       "enable_test_env_bypass_features": true,
       "finalize_batch_without_proof_timeout_sec": 7200,
       "finalize_bundle_without_proof_timeout_sec": 7200,
-      "gas_oracle_sender_private_key": "1313131313131313131313131313131313131313131313131313131313131313",
-      "commit_sender_private_key": "1414141414141414141414141414141414141414141414141414141414141414",
-      "finalize_sender_private_key": "1515151515151515151515151515151515151515151515151515151515151515",
+      "gas_oracle_sender_signer_config": {
+        "signer_type": "PrivateKey",
+        "private_key_signer_config": {
+          "private_key": "1313131313131313131313131313131313131313131313131313131313131313"
+        }
+      },
+      "commit_sender_signer_config": {
+        "signer_type": "PrivateKey",
+        "private_key_signer_config": {
+          "private_key": "1414141414141414141414141414141414141414141414141414141414141414"
+        }
+      },
+      "finalize_sender_signer_config": {
+        "signer_type": "PrivateKey",
+        "private_key_signer_config": {
+          "private_key": "1515151515151515151515151515151515151515151515151515151515151515"
+        }
+      },
       "l1_commit_gas_limit_multiplier": 1.2
     },
     "chunk_proposer_config": {

rollup/internal/config/config_test.go

@@ -61,24 +61,25 @@ func TestConfig(t *testing.T) {
 		assert.NoError(t, err)
 
 		os.Setenv("SCROLL_ROLLUP_DB_CONFIG_DSN", "postgres://test:test@postgresql:5432/scroll?sslmode=disable")
-		os.Setenv("SCROLL_ROLLUP_L1_CONFIG_RELAYER_CONFIG_GAS_ORACLE_SENDER_PRIVATE_KEY", "1616161616161616161616161616161616161616161616161616161616161616")
-		os.Setenv("SCROLL_ROLLUP_L2_CONFIG_RELAYER_CONFIG_GAS_ORACLE_SENDER_PRIVATE_KEY", "1717171717171717171717171717171717171717171717171717171717171717")
-		os.Setenv("SCROLL_ROLLUP_L2_CONFIG_RELAYER_CONFIG_COMMIT_SENDER_PRIVATE_KEY", "1818181818181818181818181818181818181818181818181818181818181818")
-		os.Setenv("SCROLL_ROLLUP_L2_CONFIG_RELAYER_CONFIG_FINALIZE_SENDER_PRIVATE_KEY", "1919191919191919191919191919191919191919191919191919191919191919")
+		os.Setenv("SCROLL_ROLLUP_L1_CONFIG_RELAYER_CONFIG_GAS_ORACLE_SENDER_SIGNER_CONFIG_PRIVATE_KEY_SIGNER_CONFIG_PRIVATE_KEY", "1616161616161616161616161616161616161616161616161616161616161616")
+		os.Setenv("SCROLL_ROLLUP_L2_CONFIG_RELAYER_CONFIG_GAS_ORACLE_SENDER_SIGNER_CONFIG_PRIVATE_KEY_SIGNER_CONFIG_PRIVATE_KEY", "1717171717171717171717171717171717171717171717171717171717171717")
+		os.Setenv("SCROLL_ROLLUP_L2_CONFIG_RELAYER_CONFIG_COMMIT_SENDER_SIGNER_CONFIG_PRIVATE_KEY_SIGNER_CONFIG_PRIVATE_KEY", "1818181818181818181818181818181818181818181818181818181818181818")
+		os.Setenv("SCROLL_ROLLUP_L2_CONFIG_RELAYER_CONFIG_FINALIZE_SENDER_SIGNER_CONFIG_PRIVATE_KEY_SIGNER_CONFIG_PRIVATE_KEY", "1919191919191919191919191919191919191919191919191919191919191919")
 
 		cfg2, err := NewConfig("../../conf/config.json")
 		assert.NoError(t, err)
 
 		assert.NotEqual(t, cfg.DBConfig.DSN, cfg2.DBConfig.DSN)
-		assert.NotEqual(t, cfg.L1Config.RelayerConfig.GasOracleSenderPrivateKey, cfg2.L1Config.RelayerConfig.GasOracleSenderPrivateKey)
-		assert.NotEqual(t, cfg.L2Config.RelayerConfig.GasOracleSenderPrivateKey, cfg2.L2Config.RelayerConfig.GasOracleSenderPrivateKey)
-		assert.NotEqual(t, cfg.L2Config.RelayerConfig.CommitSenderPrivateKey, cfg2.L2Config.RelayerConfig.CommitSenderPrivateKey)
-		assert.NotEqual(t, cfg.L2Config.RelayerConfig.FinalizeSenderPrivateKey, cfg2.L2Config.RelayerConfig.FinalizeSenderPrivateKey)
+		assert.NotEqual(t, cfg.L1Config.RelayerConfig.GasOracleSenderSignerConfig, cfg2.L1Config.RelayerConfig.GasOracleSenderSignerConfig)
+		assert.NotEqual(t, cfg.L2Config.RelayerConfig.GasOracleSenderSignerConfig, cfg2.L2Config.RelayerConfig.GasOracleSenderSignerConfig)
+		assert.NotEqual(t, cfg.L2Config.RelayerConfig.CommitSenderSignerConfig, cfg2.L2Config.RelayerConfig.CommitSenderSignerConfig)
+		assert.NotEqual(t, cfg.L2Config.RelayerConfig.FinalizeSenderSignerConfig, cfg2.L2Config.RelayerConfig.FinalizeSenderSignerConfig)
 
 		assert.Equal(t, cfg2.DBConfig.DSN, "postgres://test:test@postgresql:5432/scroll?sslmode=disable")
-		assert.Equal(t, "1616161616161616161616161616161616161616161616161616161616161616", cfg2.L1Config.RelayerConfig.GasOracleSenderPrivateKey)
-		assert.Equal(t, "1717171717171717171717171717171717171717171717171717171717171717", cfg2.L2Config.RelayerConfig.GasOracleSenderPrivateKey)
-		assert.Equal(t, "1818181818181818181818181818181818181818181818181818181818181818", cfg2.L2Config.RelayerConfig.CommitSenderPrivateKey)
-		assert.Equal(t, "1919191919191919191919191919191919191919191919191919191919191919", cfg2.L2Config.RelayerConfig.FinalizeSenderPrivateKey)
+		assert.Equal(t, "1414141414141414141414141414141414141414141414141414141414141414", cfg.L2Config.RelayerConfig.CommitSenderSignerConfig.PrivateKeySignerConfig.PrivateKey)
+		assert.Equal(t, "1616161616161616161616161616161616161616161616161616161616161616", cfg2.L1Config.RelayerConfig.GasOracleSenderSignerConfig.PrivateKeySignerConfig.PrivateKey)
+		assert.Equal(t, "1717171717171717171717171717171717171717171717171717171717171717", cfg2.L2Config.RelayerConfig.GasOracleSenderSignerConfig.PrivateKeySignerConfig.PrivateKey)
+		assert.Equal(t, "1818181818181818181818181818181818181818181818181818181818181818", cfg2.L2Config.RelayerConfig.CommitSenderSignerConfig.PrivateKeySignerConfig.PrivateKey)
+		assert.Equal(t, "1919191919191919191919191919191919191919191919191919191919191919", cfg2.L2Config.RelayerConfig.FinalizeSenderSignerConfig.PrivateKeySignerConfig.PrivateKey)
 	})
 }

rollup/internal/config/relayer.go

@@ -54,10 +54,11 @@ type RelayerConfig struct {
 	ChainMonitor *ChainMonitor `json:"chain_monitor"`
 	// L1CommitGasLimitMultiplier multiplier for fallback gas limit in commitBatch txs
 	L1CommitGasLimitMultiplier float64 `json:"l1_commit_gas_limit_multiplier,omitempty"`
-	// The private key of the relayer
-	GasOracleSenderPrivateKey string `json:"gas_oracle_sender_private_key"`
-	CommitSenderPrivateKey    string `json:"commit_sender_private_key"`
-	FinalizeSenderPrivateKey  string `json:"finalize_sender_private_key"`
+
+	// Configs of transaction signers (GasOracle, Commit, Finalize)
+	GasOracleSenderSignerConfig *SignerConfig `json:"gas_oracle_sender_signer_config"`
+	CommitSenderSignerConfig    *SignerConfig `json:"commit_sender_signer_config"`
+	FinalizeSenderSignerConfig  *SignerConfig `json:"finalize_sender_signer_config"`
 
 	// Indicates if bypass features specific to testing environments are enabled.
 	EnableTestEnvBypassFeatures bool `json:"enable_test_env_bypass_features"`
@@ -84,3 +85,21 @@ type GasOracleConfig struct {
 	L1BaseFeeDefault                   uint64 `json:"l1_base_fee_default"`
 	L1BlobBaseFeeDefault               uint64 `json:"l1_blob_base_fee_default"`
 }
+
+// SignerConfig - config of signer, contains type and config corresponding to type
+type SignerConfig struct {
+	SignerType             string                  `json:"signer_type"` // type of signer can be PrivateKey or RemoteSigner
+	PrivateKeySignerConfig *PrivateKeySignerConfig `json:"private_key_signer_config"`
+	RemoteSignerConfig     *RemoteSignerConfig     `json:"remote_signer_config"`
+}
+
+// PrivateKeySignerConfig - config of private signer, contains private key
+type PrivateKeySignerConfig struct {
+	PrivateKey string `json:"private_key"` // private key of signer in case of PrivateKey signerType
+}
+
+// RemoteSignerConfig - config of private signer, contains address and remote URL
+type RemoteSignerConfig struct {
+	RemoteSignerUrl string `json:"remote_signer_url"` // remote signer url (web3signer) in case of RemoteSigner signerType
+	SignerAddress   string `json:"signer_address"`    // address of signer
+}

rollup/internal/controller/relayer/l1_relayer.go

@@ -10,8 +10,6 @@ import (
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/scroll-tech/go-ethereum/accounts/abi"
-	"github.com/scroll-tech/go-ethereum/common"
-	"github.com/scroll-tech/go-ethereum/crypto"
 	"github.com/scroll-tech/go-ethereum/log"
 	"github.com/scroll-tech/go-ethereum/params"
 	"gorm.io/gorm"
@@ -54,18 +52,13 @@ type Layer1Relayer struct {
 // NewLayer1Relayer will return a new instance of Layer1RelayerClient
 func NewLayer1Relayer(ctx context.Context, db *gorm.DB, cfg *config.RelayerConfig, chainCfg *params.ChainConfig, serviceType ServiceType, reg prometheus.Registerer) (*Layer1Relayer, error) {
 	var gasOracleSender *sender.Sender
+	var err error
 
 	switch serviceType {
 	case ServiceTypeL1GasOracle:
-		pKey, err := crypto.ToECDSA(common.FromHex(cfg.GasOracleSenderPrivateKey))
+		gasOracleSender, err = sender.NewSender(ctx, cfg.SenderConfig, cfg.GasOracleSenderSignerConfig, "l1_relayer", "gas_oracle_sender", types.SenderTypeL1GasOracle, db, reg)
 		if err != nil {
-			return nil, fmt.Errorf("new gas oracle sender failed, err: %v", err)
-		}
-
-		gasOracleSender, err = sender.NewSender(ctx, cfg.SenderConfig, pKey, "l1_relayer", "gas_oracle_sender", types.SenderTypeL1GasOracle, db, reg)
-		if err != nil {
-			addr := crypto.PubkeyToAddress(pKey.PublicKey)
-			return nil, fmt.Errorf("new gas oracle sender failed for address %s, err: %v", addr.Hex(), err)
+			return nil, fmt.Errorf("new gas oracle sender failed, err: %w", err)
 		}
 
 		// Ensure test features aren't enabled on the scroll mainnet.

rollup/internal/controller/relayer/l2_relayer.go

@@ -2,7 +2,6 @@ package relayer
 
 import (
 	"context"
-	"crypto/ecdsa"
 	"errors"
 	"fmt"
 	"math/big"
@@ -76,18 +75,33 @@ type Layer2Relayer struct {
 
 // NewLayer2Relayer will return a new instance of Layer2RelayerClient
 func NewLayer2Relayer(ctx context.Context, l2Client *ethclient.Client, db *gorm.DB, cfg *config.RelayerConfig, chainCfg *params.ChainConfig, initGenesis bool, serviceType ServiceType, reg prometheus.Registerer) (*Layer2Relayer, error) {
-	gasOracleSenderPrivateKey, commitSenderPrivateKey, finalizeSenderPrivateKey, err := parsePrivateKeys(cfg)
+
+	var gasOracleSender, commitSender, finalizeSender *sender.Sender
+	var err error
+
+	// check that all 3 signer addresses are different, because there will be a problem in managing nonce for different senders
+	gasOracleSenderAddr, err := addrFromSignerConfig(cfg.GasOracleSenderSignerConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse addr from gas oracle signer config, err: %v", err)
+	}
+	commitSenderAddr, err := addrFromSignerConfig(cfg.CommitSenderSignerConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse addr from commit sender config, err: %v", err)
+	}
+	finalizeSenderAddr, err := addrFromSignerConfig(cfg.FinalizeSenderSignerConfig)
 	if err != nil {
-		return nil, fmt.Errorf("failed to parse private keys provided by config, err: %v", err)
+		return nil, fmt.Errorf("failed to parse addr from finalize sender config, err: %v", err)
+	}
+	if gasOracleSenderAddr == commitSenderAddr || gasOracleSenderAddr == finalizeSenderAddr || commitSenderAddr == finalizeSenderAddr {
+		return nil, fmt.Errorf("gas oracle, commit, and finalize sender addresses must be different. Got: Gas Oracle=%s, Commit=%s, Finalize=%s",
+			gasOracleSenderAddr.Hex(), commitSenderAddr.Hex(), finalizeSenderAddr.Hex())
 	}
 
-	var gasOracleSender, commitSender, finalizeSender *sender.Sender
 	switch serviceType {
 	case ServiceTypeL2GasOracle:
-		gasOracleSender, err = sender.NewSender(ctx, cfg.SenderConfig, gasOracleSenderPrivateKey, "l2_relayer", "gas_oracle_sender", types.SenderTypeL2GasOracle, db, reg)
+		gasOracleSender, err = sender.NewSender(ctx, cfg.SenderConfig, cfg.GasOracleSenderSignerConfig, "l2_relayer", "gas_oracle_sender", types.SenderTypeL2GasOracle, db, reg)
 		if err != nil {
-			addr := crypto.PubkeyToAddress(gasOracleSenderPrivateKey.PublicKey)
-			return nil, fmt.Errorf("new gas oracle sender failed for address %s, err: %w", addr.Hex(), err)
+			return nil, fmt.Errorf("new gas oracle sender failed, err: %w", err)
 		}
 
 		// Ensure test features aren't enabled on the ethereum mainnet.
@@ -96,16 +110,14 @@ func NewLayer2Relayer(ctx context.Context, l2Client *ethclient.Client, db *gorm.
 		}
 
 	case ServiceTypeL2RollupRelayer:
-		commitSender, err = sender.NewSender(ctx, cfg.SenderConfig, commitSenderPrivateKey, "l2_relayer", "commit_sender", types.SenderTypeCommitBatch, db, reg)
+		commitSender, err = sender.NewSender(ctx, cfg.SenderConfig, cfg.CommitSenderSignerConfig, "l2_relayer", "commit_sender", types.SenderTypeCommitBatch, db, reg)
 		if err != nil {
-			addr := crypto.PubkeyToAddress(commitSenderPrivateKey.PublicKey)
-			return nil, fmt.Errorf("new commit sender failed for address %s, err: %w", addr.Hex(), err)
+			return nil, fmt.Errorf("new commit sender failed, err: %w", err)
 		}
 
-		finalizeSender, err = sender.NewSender(ctx, cfg.SenderConfig, finalizeSenderPrivateKey, "l2_relayer", "finalize_sender", types.SenderTypeFinalizeBatch, db, reg)
+		finalizeSender, err = sender.NewSender(ctx, cfg.SenderConfig, cfg.FinalizeSenderSignerConfig, "l2_relayer", "finalize_sender", types.SenderTypeFinalizeBatch, db, reg)
 		if err != nil {
-			addr := crypto.PubkeyToAddress(finalizeSenderPrivateKey.PublicKey)
-			return nil, fmt.Errorf("new finalize sender failed for address %s, err: %w", addr.Hex(), err)
+			return nil, fmt.Errorf("new finalize sender failed, err: %w", err)
 		}
 
 		// Ensure test features aren't enabled on the ethereum mainnet.
@@ -1287,35 +1299,20 @@ func (r *Layer2Relayer) StopSenders() {
 	}
 }
 
-func parsePrivateKeys(cfg *config.RelayerConfig) (*ecdsa.PrivateKey, *ecdsa.PrivateKey, *ecdsa.PrivateKey, error) {
-	parseKey := func(hexKey string) (*ecdsa.PrivateKey, error) {
-		return crypto.ToECDSA(common.FromHex(hexKey))
-	}
-
-	gasOracleKey, err := parseKey(cfg.GasOracleSenderPrivateKey)
-	if err != nil {
-		return nil, nil, nil, fmt.Errorf("parse gas oracle sender private key failed: %w", err)
-	}
-
-	commitKey, err := parseKey(cfg.CommitSenderPrivateKey)
-	if err != nil {
-		return nil, nil, nil, fmt.Errorf("parse commit sender private key failed: %w", err)
-	}
-
-	finalizeKey, err := parseKey(cfg.FinalizeSenderPrivateKey)
-	if err != nil {
-		return nil, nil, nil, fmt.Errorf("parse finalize sender private key failed: %w", err)
-	}
-
-	// Check if all three private keys are different
-	addrGasOracle := crypto.PubkeyToAddress(gasOracleKey.PublicKey)
-	addrCommit := crypto.PubkeyToAddress(commitKey.PublicKey)
-	addrFinalize := crypto.PubkeyToAddress(finalizeKey.PublicKey)
-
-	if addrGasOracle == addrCommit || addrGasOracle == addrFinalize || addrCommit == addrFinalize {
-		return nil, nil, nil, fmt.Errorf("gas oracle, commit, and finalize sender addresses must be different. Got: Gas Oracle=%s, Commit=%s, Finalize=%s",
-			addrGasOracle.Hex(), addrCommit.Hex(), addrFinalize.Hex())
+func addrFromSignerConfig(config *config.SignerConfig) (common.Address, error) {
+	switch config.SignerType {
+	case sender.PrivateKeySignerType:
+		privKey, err := crypto.ToECDSA(common.FromHex(config.PrivateKeySignerConfig.PrivateKey))
+		if err != nil {
+			return common.Address{}, fmt.Errorf("parse sender private key failed: %w", err)
+		}
+		return crypto.PubkeyToAddress(privKey.PublicKey), nil
+	case sender.RemoteSignerType:
+		if config.RemoteSignerConfig.SignerAddress == "" {
+			return common.Address{}, fmt.Errorf("signer address is empty")
+		}
+		return common.HexToAddress(config.RemoteSignerConfig.SignerAddress), nil
+	default:
+		return common.Address{}, fmt.Errorf("failed to determine signer address, unknown signer type: %v", config.SignerType)
 	}
-
-	return gasOracleKey, commitKey, finalizeKey, nil
 }