diff --git a/db/prefixes/prefixes.go b/db/prefixes/prefixes.go
index 39cda6d..6a6ac0a 100644
--- a/db/prefixes/prefixes.go
+++ b/db/prefixes/prefixes.go
@@ -129,6 +129,82 @@ type BlockHashValue struct {
 	BlockHash []byte `json:"block_hash"`
 }
 
+func (k *BlockHashKey) PackKey() []byte {
+	prefixLen := 1
+	// b'>L'
+	n := prefixLen + 4
+	key := make([]byte, n)
+	copy(key, k.Prefix)
+	binary.BigEndian.PutUint32(key[prefixLen:], k.Height)
+
+	return key
+}
+
+func (v *BlockHashValue) PackValue() []byte {
+	value := make([]byte, 32)
+	copy(value, v.BlockHash[:32])
+
+	return value
+}
+
+func BlockHashKeyPackPartialNFields(nFields int) func(*BlockHashKey) []byte {
+	return func(u *BlockHashKey) []byte {
+		return BlockHashKeyPackPartial(u, nFields)
+	}
+}
+
+func BlockHashKeyPackPartial(k *BlockHashKey, nFields int) []byte {
+	// Limit nFields between 0 and number of fields, we always at least need
+	// the prefix, and we never need to iterate past the number of fields.
+	if nFields > 1 {
+		nFields = 1
+	}
+	if nFields < 0 {
+		nFields = 0
+	}
+
+	// b'>4sLH'
+	prefixLen := 1
+	var n = prefixLen
+	for i := 0; i <= nFields; i++ {
+		switch i {
+		case 1:
+			n += 4
+		case 2:
+			n += 4
+		case 3:
+			n += 2
+		}
+	}
+
+	key := make([]byte, n)
+
+	for i := 0; i <= nFields; i++ {
+		switch i {
+		case 0:
+			copy(key, k.Prefix)
+		case 1:
+			binary.BigEndian.PutUint32(key[prefixLen:], k.Height)
+		}
+	}
+
+	return key
+}
+
+func BlockHashKeyUnpack(key []byte) *BlockHashKey {
+	prefixLen := 1
+	return &BlockHashKey{
+		Prefix: key[:prefixLen],
+		Height: binary.BigEndian.Uint32(key[prefixLen:]),
+	}
+}
+
+func BlockHashValueUnpack(value []byte) *BlockHashValue {
+	return &BlockHashValue{
+		BlockHash: value[:32],
+	}
+}
+
 /*
 class BlockTxsKey(NamedTuple):
     height: int
@@ -2590,8 +2666,9 @@ func UnpackGenericKey(key []byte) (byte, interface{}, error) {
 		return ClaimDiff, TouchedOrDeletedClaimKeyUnpack(key), nil
 
 	case Tx:
-	case BlockHash:
 		return 0x0, nil, errors.Base("key unpack function for %v not implemented", firstByte)
+	case BlockHash:
+		return BlockHash, BlockHashKeyUnpack(key), nil
 	case Header:
 		return Header, BlockHeaderKeyUnpack(key), nil
 	case TxNum:
@@ -2664,8 +2741,9 @@ func UnpackGenericValue(key, value []byte) (byte, interface{}, error) {
 		return ClaimDiff, TouchedOrDeletedClaimValueUnpack(value), nil
 
 	case Tx:
-	case BlockHash:
 		return 0x0, nil, errors.Base("value unpack not implemented for key %v", key)
+	case BlockHash:
+		return BlockHash, BlockHashValueUnpack(value), nil
 	case Header:
 		return Header, BlockHeaderValueUnpack(value), nil
 	case TxNum:
diff --git a/db/prefixes/prefixes_test.go b/db/prefixes/prefixes_test.go
index d2ef1a6..9a29419 100644
--- a/db/prefixes/prefixes_test.go
+++ b/db/prefixes/prefixes_test.go
@@ -44,6 +44,82 @@ func testInit(filePath string) (*grocksdb.DB, [][]string, func()) {
 	return db, records, toDefer
 }
 
+func TestBlockHash(t *testing.T) {
+
+	filePath := "../../resources/block_hash.csv"
+
+	wOpts := grocksdb.NewDefaultWriteOptions()
+	db, records, toDefer := testInit(filePath)
+	defer toDefer()
+	for _, record := range records {
+		key, err := hex.DecodeString(record[0])
+		if err != nil {
+			log.Println(err)
+		}
+		val, err := hex.DecodeString(record[1])
+		if err != nil {
+			log.Println(err)
+		}
+		db.Put(wOpts, key, val)
+	}
+	// test prefix
+	options := dbpkg.NewIterateOptions().WithPrefix([]byte{prefixes.BlockHash}).WithIncludeValue(true)
+	ch := dbpkg.Iter(db, options)
+	var i = 0
+	for kv := range ch {
+		// log.Println(kv.Key)
+		gotKey := kv.Key.(*prefixes.BlockHashKey).PackKey()
+
+		keyPartial1 := prefixes.BlockHashKeyPackPartial(kv.Key.(*prefixes.BlockHashKey), 1)
+
+		// Check pack partial for sanity
+		if !bytes.HasPrefix(gotKey, keyPartial1) {
+			t.Errorf("%+v should be prefix of %+v\n", keyPartial1, gotKey)
+		}
+
+		got := kv.Value.(*prefixes.BlockHashValue).PackValue()
+		wantKey, err := hex.DecodeString(records[i][0])
+		if err != nil {
+			log.Println(err)
+		}
+		want, err := hex.DecodeString(records[i][1])
+		if err != nil {
+			log.Println(err)
+		}
+		if !bytes.Equal(gotKey, wantKey) {
+			t.Errorf("gotKey: %+v, wantKey: %+v\n", got, want)
+		}
+		if !bytes.Equal(got, want) {
+			t.Errorf("got: %+v, want: %+v\n", got, want)
+		}
+		i++
+	}
+
+	// Test start / stop
+	start, err := hex.DecodeString(records[0][0])
+	if err != nil {
+		log.Println(err)
+	}
+	stop, err := hex.DecodeString(records[9][0])
+	if err != nil {
+		log.Println(err)
+	}
+	options2 := dbpkg.NewIterateOptions().WithStart(start).WithStop(stop).WithIncludeValue(true)
+	ch2 := dbpkg.Iter(db, options2)
+	i = 0
+	for kv := range ch2 {
+		got := kv.Value.(*prefixes.BlockHashValue).PackValue()
+		want, err := hex.DecodeString(records[i][1])
+		if err != nil {
+			log.Println(err)
+		}
+		if !bytes.Equal(got, want) {
+			t.Errorf("got: %+v, want: %+v\n", got, want)
+		}
+		i++
+	}
+}
+
 func TestBlockHeader(t *testing.T) {
 
 	filePath := "../../resources/header.csv"
diff --git a/main.go b/main.go
index 2943ebf..2fd0b01 100644
--- a/main.go
+++ b/main.go
@@ -38,7 +38,7 @@ func main() {
 
 		options := &db.IterOptions{
 			FillCache:    false,
-			Prefix:       []byte{prefixes.Header},
+			Prefix:       []byte{prefixes.BlockHash},
 			Start:        nil,
 			Stop:         nil,
 			IncludeStart: true,
@@ -49,7 +49,7 @@ func main() {
 			RawValue:     true,
 		}
 
-		db.ReadWriteRawN(dbVal, options, "./resources/header.csv", 10)
+		db.ReadWriteRawN(dbVal, options, "./resources/block_hash.csv", 10)
 
 		return
 	}
diff --git a/resources/block_hash.csv b/resources/block_hash.csv
new file mode 100644
index 0000000..5037ce8
--- /dev/null
+++ b/resources/block_hash.csv
@@ -0,0 +1,10 @@
+4300000000,63f4346a4db34fdfce29a70f5e8d11f065f6b91602b7036c7f22f3a03b28899c
+4300000001,246cb85843ac936d55388f2ff288b011add5b1b20cca9cfd19a403ca2c9ecbde
+4300000002,0044e1258b865d262587c28ff98853bc52bb31266230c1c648cc9004047a5428
+4300000003,bbf8980e3f7604896821203bf62f97f311124da1fbb95bf523fcfdb356ad19c9
+4300000004,1a650b9b7b9d132e257ff6b336ba7cd96b1796357c4fc8dd7d0bd1ff1de057d5
+4300000005,6d694b93a2bb5ac23a13ed6749a789ca751cf73d5982c459e0cd9d5d303da74c
+4300000006,b57808c188b7315583cf120fe89de923583bc7a8ebff03189145b86bf859b21b
+4300000007,a6a5b330e816242d54c8586ba9b6d63c19d921171ef3d4525b8ffc635742e83a
+4300000008,b8447f415279dffe8a09afe6f6d5e335a2f6911fce8e1d1866723d5e5e8a5306
+4300000009,558daee5a4a55fe03d912e35c7b6b0bc19ece82fd5bcb685bc36f2bc381babfd