diff --git a/beacon-chain/core/peerdas/helpers.go b/beacon-chain/core/peerdas/helpers.go
index efdc2d83f62a..ad431229875e 100644
--- a/beacon-chain/core/peerdas/helpers.go
+++ b/beacon-chain/core/peerdas/helpers.go
@@ -33,7 +33,7 @@ const (
 )
 
 // https://github.com/ethereum/consensus-specs/blob/dev/specs/_features/eip7594/p2p-interface.md#the-discovery-domain-discv5
-type Csc uint64
+type Csc uint8
 
 func (Csc) ENRKey() string { return CustodySubnetCountEnrKey }
 
diff --git a/beacon-chain/p2p/custody.go b/beacon-chain/p2p/custody.go
index 6fbeb28e20ba..33b1c3651c2d 100644
--- a/beacon-chain/p2p/custody.go
+++ b/beacon-chain/p2p/custody.go
@@ -86,7 +86,7 @@ func (s *Service) CustodyCountFromRemotePeer(pid peer.ID) uint64 {
 	if metadata != nil {
 		custodyCount := metadata.CustodySubnetCount()
 		if custodyCount > 0 {
-			return custodyCount
+			return uint64(custodyCount)
 		}
 	}
 
diff --git a/beacon-chain/p2p/custody_test.go b/beacon-chain/p2p/custody_test.go
index 9c94c3a2d8c7..08cb7d4f2ddc 100644
--- a/beacon-chain/p2p/custody_test.go
+++ b/beacon-chain/p2p/custody_test.go
@@ -121,12 +121,12 @@ func TestCustodyCountFromRemotePeer(t *testing.T) {
 
 	// Define a metadata with zero custody.
 	zeroMetadata := wrapper.WrappedMetadataV2(&pb.MetaDataV2{
-		CustodySubnetCount: 0,
+		CustodySubnetCount: []byte{0},
 	})
 
 	// Define a nominal metadata.
 	nominalMetadata := wrapper.WrappedMetadataV2(&pb.MetaDataV2{
-		CustodySubnetCount: expectedMetadata,
+		CustodySubnetCount: []byte{uint8(expectedMetadata)},
 	})
 
 	testCases := []struct {
diff --git a/beacon-chain/p2p/discovery.go b/beacon-chain/p2p/discovery.go
index 3eb816db04b3..a0166eb70b89 100644
--- a/beacon-chain/p2p/discovery.go
+++ b/beacon-chain/p2p/discovery.go
@@ -175,7 +175,7 @@ func (s *Service) RefreshPersistentSubnets() {
 	// Get the custody subnet count in our metadata.
 	inMetadataCustodySubnetCount := s.Metadata().CustodySubnetCount()
 
-	isCustodySubnetCountUpToDate := (custodySubnetCount == inRecordCustodySubnetCount && custodySubnetCount == inMetadataCustodySubnetCount)
+	isCustodySubnetCountUpToDate := custodySubnetCount == inRecordCustodySubnetCount && custodySubnetCount == uint64(inMetadataCustodySubnetCount)
 
 	if isBitVUpToDate && isBitSUpToDate && isCustodySubnetCountUpToDate {
 		// Nothing to do, return early.
diff --git a/beacon-chain/p2p/discovery_test.go b/beacon-chain/p2p/discovery_test.go
index bb4b1eecc93d..c159717573d8 100644
--- a/beacon-chain/p2p/discovery_test.go
+++ b/beacon-chain/p2p/discovery_test.go
@@ -473,7 +473,7 @@ type check struct {
 	metadataSequenceNumber uint64
 	attestationSubnets     []uint64
 	syncSubnets            []uint64
-	custodySubnetCount     *uint64
+	custodySubnetCount     *uint8
 }
 
 func checkPingCountCacheMetadataRecord(
@@ -542,7 +542,7 @@ func checkPingCountCacheMetadataRecord(
 
 	if expected.custodySubnetCount != nil {
 		// Check custody subnet count in ENR.
-		var actualCustodySubnetCount uint64
+		var actualCustodySubnetCount uint8
 		err := service.dv5Listener.LocalNode().Node().Record().Load(enr.WithEntry(peerdas.CustodySubnetCountEnrKey, &actualCustodySubnetCount))
 		require.NoError(t, err)
 		require.Equal(t, *expected.custodySubnetCount, actualCustodySubnetCount)
@@ -565,7 +565,7 @@ func TestRefreshPersistentSubnets(t *testing.T) {
 		eip7594ForkEpoch = 10
 	)
 
-	custodySubnetCount := params.BeaconConfig().CustodyRequirement
+	custodySubnetCount := uint8(params.BeaconConfig().CustodyRequirement)
 
 	// Set up epochs.
 	defaultCfg := params.BeaconConfig()
diff --git a/beacon-chain/p2p/subnets.go b/beacon-chain/p2p/subnets.go
index 1f11b8726bc0..af5b0dda216c 100644
--- a/beacon-chain/p2p/subnets.go
+++ b/beacon-chain/p2p/subnets.go
@@ -239,12 +239,13 @@ func (s *Service) updateSubnetRecordWithMetadataV3(
 	localNode.Set(custodySubnetCountEntry)
 
 	newSeqNumber := s.metaData.SequenceNumber() + 1
+	cscBytes := []byte{uint8(custodySubnetCount)}
 
 	s.metaData = wrapper.WrappedMetadataV2(&pb.MetaDataV2{
 		SeqNumber:          newSeqNumber,
 		Attnets:            bitVAtt,
 		Syncnets:           bitVSync,
-		CustodySubnetCount: custodySubnetCount,
+		CustodySubnetCount: cscBytes,
 	})
 }
 
diff --git a/beacon-chain/sync/rpc_metadata.go b/beacon-chain/sync/rpc_metadata.go
index 5b0e72ce7f2c..d46f5075fb26 100644
--- a/beacon-chain/sync/rpc_metadata.go
+++ b/beacon-chain/sync/rpc_metadata.go
@@ -104,7 +104,7 @@ func (s *Service) metaDataHandler(_ context.Context, _ interface{}, stream libp2
 					Attnets:            metadata.AttnetsBitfield(),
 					SeqNumber:          metadata.SequenceNumber(),
 					Syncnets:           bitfield.Bitvector4{byte(0x00)},
-					CustodySubnetCount: 0,
+					CustodySubnetCount: []byte{0},
 				})
 		case version.Altair:
 			metadata = wrapper.WrappedMetadataV2(
@@ -112,7 +112,7 @@ func (s *Service) metaDataHandler(_ context.Context, _ interface{}, stream libp2
 					Attnets:            metadata.AttnetsBitfield(),
 					SeqNumber:          metadata.SequenceNumber(),
 					Syncnets:           metadata.SyncnetsBitfield(),
-					CustodySubnetCount: 0,
+					CustodySubnetCount: []byte{0},
 				})
 		}
 	}
diff --git a/beacon-chain/sync/rpc_metadata_test.go b/beacon-chain/sync/rpc_metadata_test.go
index 005269c3005d..56c6c92fd7a6 100644
--- a/beacon-chain/sync/rpc_metadata_test.go
+++ b/beacon-chain/sync/rpc_metadata_test.go
@@ -153,7 +153,7 @@ func TestMetadataRPCHandler_SendMetadataRequest(t *testing.T) {
 				SeqNumber:          seqNumber,
 				Attnets:            attnets,
 				Syncnets:           syncnets,
-				CustodySubnetCount: custodySubnetCount,
+				CustodySubnetCount: []byte{custodySubnetCount},
 			}),
 			expected: wrapper.WrappedMetadataV0(&pb.MetaDataV0{
 				SeqNumber: seqNumber,
@@ -200,7 +200,7 @@ func TestMetadataRPCHandler_SendMetadataRequest(t *testing.T) {
 				SeqNumber:          seqNumber,
 				Attnets:            attnets,
 				Syncnets:           syncnets,
-				CustodySubnetCount: custodySubnetCount,
+				CustodySubnetCount: []byte{custodySubnetCount},
 			}),
 			expected: wrapper.WrappedMetadataV1(&pb.MetaDataV1{
 				SeqNumber: seqNumber,
@@ -221,7 +221,7 @@ func TestMetadataRPCHandler_SendMetadataRequest(t *testing.T) {
 				SeqNumber:          seqNumber,
 				Attnets:            attnets,
 				Syncnets:           bitfield.Bitvector4{byte(0x00)},
-				CustodySubnetCount: 0,
+				CustodySubnetCount: []byte{0},
 			}),
 		},
 		{
@@ -238,7 +238,7 @@ func TestMetadataRPCHandler_SendMetadataRequest(t *testing.T) {
 				SeqNumber:          seqNumber,
 				Attnets:            attnets,
 				Syncnets:           syncnets,
-				CustodySubnetCount: 0,
+				CustodySubnetCount: []byte{0},
 			}),
 		},
 		{
@@ -250,13 +250,13 @@ func TestMetadataRPCHandler_SendMetadataRequest(t *testing.T) {
 				SeqNumber:          seqNumber,
 				Attnets:            attnets,
 				Syncnets:           syncnets,
-				CustodySubnetCount: custodySubnetCount,
+				CustodySubnetCount: []byte{custodySubnetCount},
 			}),
 			expected: wrapper.WrappedMetadataV2(&pb.MetaDataV2{
 				SeqNumber:          seqNumber,
 				Attnets:            attnets,
 				Syncnets:           syncnets,
-				CustodySubnetCount: custodySubnetCount,
+				CustodySubnetCount: []byte{custodySubnetCount},
 			}),
 		},
 	}
diff --git a/consensus-types/wrapper/BUILD.bazel b/consensus-types/wrapper/BUILD.bazel
index d4e5da022448..cb3bfd541c85 100644
--- a/consensus-types/wrapper/BUILD.bazel
+++ b/consensus-types/wrapper/BUILD.bazel
@@ -6,6 +6,7 @@ go_library(
     importpath = "github.com/prysmaticlabs/prysm/v5/consensus-types/wrapper",
     visibility = ["//visibility:public"],
     deps = [
+        "//encoding/bytesutil:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v1alpha1/metadata:go_default_library",
         "//runtime/version:go_default_library",
diff --git a/consensus-types/wrapper/metadata.go b/consensus-types/wrapper/metadata.go
index adbbc81e4c50..6f050f8f2218 100644
--- a/consensus-types/wrapper/metadata.go
+++ b/consensus-types/wrapper/metadata.go
@@ -2,6 +2,7 @@ package wrapper
 
 import (
 	"github.com/prysmaticlabs/go-bitfield"
+	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	pb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1/metadata"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
@@ -37,7 +38,7 @@ func (m MetadataV0) SyncnetsBitfield() bitfield.Bitvector4 {
 }
 
 // CustodySubnetCount returns custody subnet count from the metadata.
-func (m MetadataV0) CustodySubnetCount() uint64 {
+func (m MetadataV0) CustodySubnetCount() uint8 {
 	return 0
 }
 
@@ -131,7 +132,7 @@ func (m MetadataV1) SyncnetsBitfield() bitfield.Bitvector4 {
 }
 
 // CustodySubnetCount returns custody subnet count from the metadata.
-func (m MetadataV1) CustodySubnetCount() uint64 {
+func (m MetadataV1) CustodySubnetCount() uint8 {
 	return 0
 }
 
@@ -225,8 +226,8 @@ func (m MetadataV2) SyncnetsBitfield() bitfield.Bitvector4 {
 }
 
 // CustodySubnetCount returns custody subnet count from the metadata.
-func (m MetadataV2) CustodySubnetCount() uint64 {
-	return m.md.CustodySubnetCount
+func (m MetadataV2) CustodySubnetCount() uint8 {
+	return bytesutil.FromBytes1(m.md.CustodySubnetCount)
 }
 
 // InnerObject returns the underlying metadata protobuf structure.
diff --git a/encoding/bytesutil/integers.go b/encoding/bytesutil/integers.go
index cded88f1266e..37c117250f1a 100644
--- a/encoding/bytesutil/integers.go
+++ b/encoding/bytesutil/integers.go
@@ -66,6 +66,14 @@ func Bytes32(x uint64) []byte {
 	return bytes
 }
 
+// FromBytes1 returns an integer from a byte slice with a size of 1.
+func FromBytes1(x []byte) uint8 {
+	if len(x) < 1 {
+		return 0
+	}
+	return x[0]
+}
+
 // FromBytes2 returns an integer which is stored in the little-endian format(2, 'little')
 // from a byte array.
 func FromBytes2(x []byte) uint16 {
diff --git a/proto/prysm/v1alpha1/metadata/metadata_interfaces.go b/proto/prysm/v1alpha1/metadata/metadata_interfaces.go
index b57a8753ceb7..64c6840f0b9f 100644
--- a/proto/prysm/v1alpha1/metadata/metadata_interfaces.go
+++ b/proto/prysm/v1alpha1/metadata/metadata_interfaces.go
@@ -11,7 +11,7 @@ type Metadata interface {
 	SequenceNumber() uint64
 	AttnetsBitfield() bitfield.Bitvector64
 	SyncnetsBitfield() bitfield.Bitvector4
-	CustodySubnetCount() uint64
+	CustodySubnetCount() uint8
 	InnerObject() interface{}
 	IsNil() bool
 	Copy() Metadata
diff --git a/proto/prysm/v1alpha1/non-core.ssz.go b/proto/prysm/v1alpha1/non-core.ssz.go
index 9d949949848c..c03345d92d6e 100644
--- a/proto/prysm/v1alpha1/non-core.ssz.go
+++ b/proto/prysm/v1alpha1/non-core.ssz.go
@@ -1,5 +1,5 @@
 // Code generated by fastssz. DO NOT EDIT.
-// Hash: ac6fbb6f912d4e5a3374b91a3dc73c1d5ac1e5b4a9c32513b3d5ef9de7885be8
+// Hash: 2b6089e02fcaeb5244f5bd8568b0d90eca6cccd827a21f19affac4a07bb8d355
 package eth
 
 import (
@@ -578,7 +578,11 @@ func (m *MetaDataV2) MarshalSSZTo(buf []byte) (dst []byte, err error) {
 	dst = append(dst, m.Syncnets...)
 
 	// Field (3) 'CustodySubnetCount'
-	dst = ssz.MarshalUint64(dst, m.CustodySubnetCount)
+	if size := len(m.CustodySubnetCount); size != 1 {
+		err = ssz.ErrBytesLengthFn("--.CustodySubnetCount", size, 1)
+		return
+	}
+	dst = append(dst, m.CustodySubnetCount...)
 
 	return
 }
@@ -587,7 +591,7 @@ func (m *MetaDataV2) MarshalSSZTo(buf []byte) (dst []byte, err error) {
 func (m *MetaDataV2) UnmarshalSSZ(buf []byte) error {
 	var err error
 	size := uint64(len(buf))
-	if size != 25 {
+	if size != 18 {
 		return ssz.ErrSize
 	}
 
@@ -607,14 +611,17 @@ func (m *MetaDataV2) UnmarshalSSZ(buf []byte) error {
 	m.Syncnets = append(m.Syncnets, buf[16:17]...)
 
 	// Field (3) 'CustodySubnetCount'
-	m.CustodySubnetCount = ssz.UnmarshallUint64(buf[17:25])
+	if cap(m.CustodySubnetCount) == 0 {
+		m.CustodySubnetCount = make([]byte, 0, len(buf[17:18]))
+	}
+	m.CustodySubnetCount = append(m.CustodySubnetCount, buf[17:18]...)
 
 	return err
 }
 
 // SizeSSZ returns the ssz encoded size in bytes for the MetaDataV2 object
 func (m *MetaDataV2) SizeSSZ() (size int) {
-	size = 25
+	size = 18
 	return
 }
 
@@ -645,7 +652,11 @@ func (m *MetaDataV2) HashTreeRootWith(hh *ssz.Hasher) (err error) {
 	hh.PutBytes(m.Syncnets)
 
 	// Field (3) 'CustodySubnetCount'
-	hh.PutUint64(m.CustodySubnetCount)
+	if size := len(m.CustodySubnetCount); size != 1 {
+		err = ssz.ErrBytesLengthFn("--.CustodySubnetCount", size, 1)
+		return
+	}
+	hh.PutBytes(m.CustodySubnetCount)
 
 	hh.Merkleize(indx)
 	return
diff --git a/proto/prysm/v1alpha1/p2p_messages.pb.go b/proto/prysm/v1alpha1/p2p_messages.pb.go
index 796dc5d3c038..4a963cffe4e4 100755
--- a/proto/prysm/v1alpha1/p2p_messages.pb.go
+++ b/proto/prysm/v1alpha1/p2p_messages.pb.go
@@ -356,7 +356,7 @@ type MetaDataV2 struct {
 	SeqNumber          uint64                                           `protobuf:"varint,1,opt,name=seq_number,json=seqNumber,proto3" json:"seq_number,omitempty"`
 	Attnets            github_com_prysmaticlabs_go_bitfield.Bitvector64 `protobuf:"bytes,2,opt,name=attnets,proto3" json:"attnets,omitempty" cast-type:"github.com/prysmaticlabs/go-bitfield.Bitvector64" ssz-size:"8"`
 	Syncnets           github_com_prysmaticlabs_go_bitfield.Bitvector4  `protobuf:"bytes,3,opt,name=syncnets,proto3" json:"syncnets,omitempty" cast-type:"github.com/prysmaticlabs/go-bitfield.Bitvector4" ssz-size:"1"`
-	CustodySubnetCount uint64                                           `protobuf:"varint,4,opt,name=custody_subnet_count,json=custodySubnetCount,proto3" json:"custody_subnet_count,omitempty"`
+	CustodySubnetCount []byte                                           `protobuf:"bytes,4,opt,name=custody_subnet_count,json=custodySubnetCount,proto3" json:"custody_subnet_count,omitempty" ssz-size:"1"`
 }
 
 func (x *MetaDataV2) Reset() {
@@ -412,11 +412,11 @@ func (x *MetaDataV2) GetSyncnets() github_com_prysmaticlabs_go_bitfield.Bitvecto
 	return github_com_prysmaticlabs_go_bitfield.Bitvector4(nil)
 }
 
-func (x *MetaDataV2) GetCustodySubnetCount() uint64 {
+func (x *MetaDataV2) GetCustodySubnetCount() []byte {
 	if x != nil {
 		return x.CustodySubnetCount
 	}
-	return 0
+	return nil
 }
 
 type BlobSidecarsByRangeRequest struct {
@@ -616,7 +616,7 @@ var file_proto_prysm_v1alpha1_p2p_messages_proto_rawDesc = []byte{
 	0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x70, 0x72, 0x79, 0x73, 0x6d,
 	0x61, 0x74, 0x69, 0x63, 0x6c, 0x61, 0x62, 0x73, 0x2f, 0x67, 0x6f, 0x2d, 0x62, 0x69, 0x74, 0x66,
 	0x69, 0x65, 0x6c, 0x64, 0x2e, 0x42, 0x69, 0x74, 0x76, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x34, 0x8a,
-	0xb5, 0x18, 0x01, 0x31, 0x52, 0x08, 0x73, 0x79, 0x6e, 0x63, 0x6e, 0x65, 0x74, 0x73, 0x22, 0x88,
+	0xb5, 0x18, 0x01, 0x31, 0x52, 0x08, 0x73, 0x79, 0x6e, 0x63, 0x6e, 0x65, 0x74, 0x73, 0x22, 0x8f,
 	0x02, 0x0a, 0x0a, 0x4d, 0x65, 0x74, 0x61, 0x44, 0x61, 0x74, 0x61, 0x56, 0x32, 0x12, 0x1d, 0x0a,
 	0x0a, 0x73, 0x65, 0x71, 0x5f, 0x6e, 0x75, 0x6d, 0x62, 0x65, 0x72, 0x18, 0x01, 0x20, 0x01, 0x28,
 	0x04, 0x52, 0x09, 0x73, 0x65, 0x71, 0x4e, 0x75, 0x6d, 0x62, 0x65, 0x72, 0x12, 0x53, 0x0a, 0x07,
@@ -630,42 +630,43 @@ var file_proto_prysm_v1alpha1_p2p_messages_proto_rawDesc = []byte{
 	0x63, 0x6f, 0x6d, 0x2f, 0x70, 0x72, 0x79, 0x73, 0x6d, 0x61, 0x74, 0x69, 0x63, 0x6c, 0x61, 0x62,
 	0x73, 0x2f, 0x67, 0x6f, 0x2d, 0x62, 0x69, 0x74, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x2e, 0x42, 0x69,
 	0x74, 0x76, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x34, 0x8a, 0xb5, 0x18, 0x01, 0x31, 0x52, 0x08, 0x73,
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+	0x79, 0x6e, 0x63, 0x6e, 0x65, 0x74, 0x73, 0x12, 0x37, 0x0a, 0x14, 0x63, 0x75, 0x73, 0x74, 0x6f,
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 }
 
 var (
diff --git a/proto/prysm/v1alpha1/p2p_messages.proto b/proto/prysm/v1alpha1/p2p_messages.proto
index 0ea6a4772760..83979d7a759e 100644
--- a/proto/prysm/v1alpha1/p2p_messages.proto
+++ b/proto/prysm/v1alpha1/p2p_messages.proto
@@ -74,7 +74,7 @@ message MetaDataV2 {
   uint64 seq_number = 1;
   bytes attnets = 2 [(ethereum.eth.ext.ssz_size) = "8", (ethereum.eth.ext.cast_type) = "github.com/prysmaticlabs/go-bitfield.Bitvector64"];
   bytes syncnets = 3 [(ethereum.eth.ext.ssz_size) = "1", (ethereum.eth.ext.cast_type) = "github.com/prysmaticlabs/go-bitfield.Bitvector4"];
-  uint64 custody_subnet_count = 4;
+  bytes custody_subnet_count = 4 [(ethereum.eth.ext.ssz_size) = "1"];
 }
 
 /*