diff --git a/driver/txlist_decompressor/txlist_decompressor.go b/driver/txlist_decompressor/txlist_decompressor.go
index 9018af0ac..a26edc1d9 100644
--- a/driver/txlist_decompressor/txlist_decompressor.go
+++ b/driver/txlist_decompressor/txlist_decompressor.go
@@ -6,6 +6,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rlp"
+
 	"github.com/taikoxyz/taiko-client/internal/utils"
 )
 
diff --git a/driver/txlist_decompressor/txlist_decompressor_test.go b/driver/txlist_decompressor/txlist_decompressor_test.go
index a816b9e5f..a2d676f10 100644
--- a/driver/txlist_decompressor/txlist_decompressor_test.go
+++ b/driver/txlist_decompressor/txlist_decompressor_test.go
@@ -13,6 +13,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/stretchr/testify/require"
+
 	"github.com/taikoxyz/taiko-client/internal/utils"
 )
 
diff --git a/prover/config.go b/prover/config.go
index fc3150a0f..7f78e4128 100644
--- a/prover/config.go
+++ b/prover/config.go
@@ -118,11 +118,6 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 		}
 	}
 
-	// If we are not running a guardian prover, a raiko host endpoint is required.
-	if !c.IsSet(flags.GuardianProver.Name) && !c.IsSet(flags.RaikoHostEndpoint.Name) {
-		return nil, errors.New("raiko host not provided")
-	}
-
 	var (
 		raikoL1Endpoint       = c.String(flags.RaikoL1Endpoint.Name)
 		raikoL1BeaconEndpoint = c.String(flags.RaikoL1BeaconEndpoint.Name)
diff --git a/prover/init.go b/prover/init.go
index 737b3f011..5e8dec1e0 100644
--- a/prover/init.go
+++ b/prover/init.go
@@ -110,10 +110,18 @@ func (p *Prover) initProofSubmitters(
 				L1Endpoint:        p.cfg.RaikoL1Endpoint,
 				L1BeaconEndpoint:  p.cfg.RaikoL1BeaconEndpoint,
 				L2Endpoint:        p.cfg.RaikoL2Endpoint,
+				ProofType:         proofProducer.ProofTypeSgx,
 				Dummy:             p.cfg.Dummy,
 			}
 		case encoding.TierGuardianID:
-			producer = proofProducer.NewGuardianProofProducer(p.cfg.EnableLivenessBondProof)
+			producer = proofProducer.NewGuardianProofProducer(&proofProducer.SGXProofProducer{
+				RaikoHostEndpoint: p.cfg.RaikoHostEndpoint,
+				L1Endpoint:        p.cfg.RaikoL1Endpoint,
+				L1BeaconEndpoint:  p.cfg.RaikoL1BeaconEndpoint,
+				L2Endpoint:        p.cfg.RaikoL2Endpoint,
+				ProofType:         proofProducer.ProofTypeCPU,
+				Dummy:             p.cfg.Dummy,
+			}, p.cfg.EnableLivenessBondProof)
 		default:
 			return fmt.Errorf("unsupported tier: %d", tier.ID)
 		}
diff --git a/prover/proof_producer/guardian_producer.go b/prover/proof_producer/guardian_producer.go
index d638ef1da..6385a98d2 100644
--- a/prover/proof_producer/guardian_producer.go
+++ b/prover/proof_producer/guardian_producer.go
@@ -15,18 +15,19 @@ import (
 // GuardianProofProducer always returns an optimistic (dummy) proof.
 type GuardianProofProducer struct {
 	returnLivenessBond bool
-	DummyProofProducer
+	*SGXProofProducer
 }
 
-func NewGuardianProofProducer(returnLivenessBond bool) *GuardianProofProducer {
+func NewGuardianProofProducer(sgxProofProducer *SGXProofProducer, returnLivenessBond bool) *GuardianProofProducer {
 	return &GuardianProofProducer{
+		SGXProofProducer:   sgxProofProducer,
 		returnLivenessBond: returnLivenessBond,
 	}
 }
 
 // RequestProof implements the ProofProducer interface.
 func (g *GuardianProofProducer) RequestProof(
-	_ context.Context,
+	ctx context.Context,
 	opts *ProofRequestOptions,
 	blockID *big.Int,
 	meta *bindings.TaikoDataBlockMetadata,
@@ -51,6 +52,13 @@ func (g *GuardianProofProducer) RequestProof(
 		}, nil
 	}
 
+	// Each guardian prover should check the block hash with raiko at first,
+	// before submitting the guardian proof, if raiko can return a proof without
+	// any error, which means the block hash is valid.
+	if _, err := g.SGXProofProducer.RequestProof(ctx, opts, blockID, meta, header); err != nil {
+		return nil, err
+	}
+
 	return g.DummyProofProducer.RequestProof(opts, blockID, meta, header, g.Tier())
 }
 
diff --git a/prover/proof_producer/guardian_producer_test.go b/prover/proof_producer/guardian_producer_test.go
index a6e6b6d86..6188bd325 100644
--- a/prover/proof_producer/guardian_producer_test.go
+++ b/prover/proof_producer/guardian_producer_test.go
@@ -33,7 +33,7 @@ func TestGuardianProducerRequestProof(t *testing.T) {
 	}
 
 	var (
-		producer = NewGuardianProofProducer(false)
+		producer = NewGuardianProofProducer(&SGXProofProducer{Dummy: true}, false)
 		blockID  = common.Big32
 	)
 	res, err := producer.RequestProof(
@@ -70,7 +70,7 @@ func TestGuardianProducerRequestProofReturnLivenessBond(t *testing.T) {
 	}
 
 	var (
-		producer = NewGuardianProofProducer(true)
+		producer = NewGuardianProofProducer(&SGXProofProducer{Dummy: true}, true)
 		blockID  = common.Big32
 	)
 	res, err := producer.RequestProof(
diff --git a/prover/proof_producer/sgx_producer.go b/prover/proof_producer/sgx_producer.go
index f306a8dfa..a4068b8fa 100644
--- a/prover/proof_producer/sgx_producer.go
+++ b/prover/proof_producer/sgx_producer.go
@@ -21,12 +21,18 @@ import (
 	"github.com/taikoxyz/taiko-client/internal/metrics"
 )
 
+const (
+	ProofTypeSgx = "sgx"
+	ProofTypeCPU = "native"
+)
+
 // SGXProofProducer generates a SGX proof for the given block.
 type SGXProofProducer struct {
 	RaikoHostEndpoint string // a proverd RPC endpoint
 	L1Endpoint        string // a L1 node RPC endpoint
 	L1BeaconEndpoint  string // a L1 beacon node RPC endpoint
 	L2Endpoint        string // a L2 execution engine's RPC endpoint
+	ProofType         string // Proof type
 	Dummy             bool
 	DummyProofProducer
 }
@@ -161,7 +167,7 @@ func (s *SGXProofProducer) requestProof(opts *ProofRequestOptions) (*RaikoHostOu
 		ID:      common.Big1,
 		Method:  "proof",
 		Params: []*SGXRequestProofBodyParam{{
-			Type:        "sgx",
+			Type:        s.ProofType,
 			Block:       opts.BlockID,
 			L2RPC:       s.L2Endpoint,
 			L1RPC:       s.L1Endpoint,