diff --git a/core/bcast/bcast.go b/core/bcast/bcast.go
index bd7a6674c..e3a579a7a 100644
--- a/core/bcast/bcast.go
+++ b/core/bcast/bcast.go
@@ -29,6 +29,7 @@ import (
 
 type eth2Provider interface {
 	eth2client.AttestationsSubmitter
+	eth2client.BeaconBlockSubmitter
 }
 
 // New returns a new broadcaster instance.
@@ -63,7 +64,14 @@ func (b Broadcaster) Broadcast(ctx context.Context, duty core.Duty,
 		}
 
 		return b.eth2Cl.SubmitAttestations(ctx, []*eth2p0.Attestation{att})
+	case core.DutyProposer:
+		block, err := core.DecodeBlockAggSignedData(aggData)
+		if err != nil {
+			return err
+		}
+
+		return b.eth2Cl.SubmitBeaconBlock(ctx, block)
 	default:
-		return errors.New("unsuppered duty type")
+		return errors.New("unsupported duty type")
 	}
 }
diff --git a/core/bcast/bcast_test.go b/core/bcast/bcast_test.go
index d2bb3173c..282edb5c5 100644
--- a/core/bcast/bcast_test.go
+++ b/core/bcast/bcast_test.go
@@ -19,6 +19,7 @@ import (
 	"context"
 	"testing"
 
+	"github.com/attestantio/go-eth2-client/spec"
 	eth2p0 "github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/stretchr/testify/require"
 
@@ -54,3 +55,34 @@ func TestBroadcastAttestation(t *testing.T) {
 
 	<-ctx.Done()
 }
+
+func TestBroadcastBeaconBlock(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	mock, err := beaconmock.New()
+	require.NoError(t, err)
+
+	block1 := &spec.VersionedSignedBeaconBlock{
+		Version: spec.DataVersionPhase0,
+		Phase0: &eth2p0.SignedBeaconBlock{
+			Message:   testutil.RandomPhase0BeaconBlock(),
+			Signature: testutil.RandomEth2Signature(),
+		},
+	}
+	aggData, err := core.EncodeBlockAggSignedData(block1)
+	require.NoError(t, err)
+
+	mock.SubmitBeaconBlockFunc = func(ctx context.Context, block2 *spec.VersionedSignedBeaconBlock) error {
+		require.Equal(t, block1, block2)
+		cancel()
+
+		return ctx.Err()
+	}
+
+	bcaster, err := bcast.New(mock)
+	require.NoError(t, err)
+
+	err = bcaster.Broadcast(ctx, core.Duty{Type: core.DutyProposer}, "", aggData)
+	require.ErrorIs(t, err, context.Canceled)
+
+	<-ctx.Done()
+}