diff --git a/gointerfaces/type_utils.go b/gointerfaces/type_utils.go
new file mode 100644
index 000000000..dac95908b
--- /dev/null
+++ b/gointerfaces/type_utils.go
@@ -0,0 +1,96 @@
+package gointerfaces
+
+import (
+	"encoding/binary"
+
+	"github.com/holiman/uint256"
+	"github.com/ledgerwatch/erigon-lib/gointerfaces/types"
+)
+
+func ConvertH256ToHash(h256 *types.H256) [32]byte {
+	var hash [32]byte
+	binary.BigEndian.PutUint64(hash[0:], h256.Hi.Hi)
+	binary.BigEndian.PutUint64(hash[8:], h256.Hi.Lo)
+	binary.BigEndian.PutUint64(hash[16:], h256.Lo.Hi)
+	binary.BigEndian.PutUint64(hash[24:], h256.Lo.Lo)
+	return hash
+}
+
+func ConvertHashesToH256(hashes [][32]byte) []*types.H256 {
+	res := make([]*types.H256, len(hashes))
+	for i := range hashes {
+		res[i] = ConvertHashToH256(hashes[i])
+	}
+	return res
+}
+
+func ConvertHashToH256(hash [32]byte) *types.H256 {
+	return &types.H256{
+		Lo: &types.H128{Lo: binary.BigEndian.Uint64(hash[24:]), Hi: binary.BigEndian.Uint64(hash[16:])},
+		Hi: &types.H128{Lo: binary.BigEndian.Uint64(hash[8:]), Hi: binary.BigEndian.Uint64(hash[0:])},
+	}
+}
+
+func ConvertH160toAddress(h160 *types.H160) [20]byte {
+	var addr [20]byte
+	binary.BigEndian.PutUint64(addr[0:], h160.Hi.Hi)
+	binary.BigEndian.PutUint64(addr[8:], h160.Hi.Lo)
+	binary.BigEndian.PutUint32(addr[16:], h160.Lo)
+	return addr
+}
+
+func ConvertAddressToH160(addr [20]byte) *types.H160 {
+	return &types.H160{
+		Lo: binary.BigEndian.Uint32(addr[16:]),
+		Hi: &types.H128{Lo: binary.BigEndian.Uint64(addr[8:]), Hi: binary.BigEndian.Uint64(addr[0:])},
+	}
+}
+
+func ConvertH256ToUint256Int(h256 *types.H256) *uint256.Int {
+	// Note: uint256.Int is an array of 4 uint64 in little-endian order, i.e. most significant word is [3]
+	var i uint256.Int
+	i[3] = h256.Hi.Hi
+	i[2] = h256.Hi.Lo
+	i[1] = h256.Lo.Hi
+	i[0] = h256.Lo.Lo
+	return &i
+}
+
+func ConvertUint256IntToH256(i *uint256.Int) *types.H256 {
+	// Note: uint256.Int is an array of 4 uint64 in little-endian order, i.e. most significant word is [3]
+	return &types.H256{
+		Lo: &types.H128{Lo: i[0], Hi: i[1]},
+		Hi: &types.H128{Lo: i[2], Hi: i[3]},
+	}
+}
+
+func ConvertH512ToBytes(h512 *types.H512) []byte {
+	var b [64]byte
+	binary.BigEndian.PutUint64(b[0:], h512.Hi.Hi.Hi)
+	binary.BigEndian.PutUint64(b[8:], h512.Hi.Hi.Lo)
+	binary.BigEndian.PutUint64(b[16:], h512.Hi.Lo.Hi)
+	binary.BigEndian.PutUint64(b[24:], h512.Hi.Lo.Lo)
+	binary.BigEndian.PutUint64(b[32:], h512.Lo.Hi.Hi)
+	binary.BigEndian.PutUint64(b[40:], h512.Lo.Hi.Lo)
+	binary.BigEndian.PutUint64(b[48:], h512.Lo.Lo.Hi)
+	binary.BigEndian.PutUint64(b[56:], h512.Lo.Lo.Lo)
+	return b[:]
+}
+
+func ConvertBytesToH512(b []byte) *types.H512 {
+	if len(b) < 64 {
+		var b1 [64]byte
+		copy(b1[:], b)
+		b = b1[:]
+	}
+	return &types.H512{
+		Lo: &types.H256{
+			Lo: &types.H128{Lo: binary.BigEndian.Uint64(b[56:]), Hi: binary.BigEndian.Uint64(b[48:])},
+			Hi: &types.H128{Lo: binary.BigEndian.Uint64(b[40:]), Hi: binary.BigEndian.Uint64(b[32:])},
+		},
+		Hi: &types.H256{
+			Lo: &types.H128{Lo: binary.BigEndian.Uint64(b[24:]), Hi: binary.BigEndian.Uint64(b[16:])},
+			Hi: &types.H128{Lo: binary.BigEndian.Uint64(b[8:]), Hi: binary.BigEndian.Uint64(b[0:])},
+		},
+	}
+}
diff --git a/gointerfaces/version.go b/gointerfaces/version.go
new file mode 100644
index 000000000..3adc94602
--- /dev/null
+++ b/gointerfaces/version.go
@@ -0,0 +1,46 @@
+/*
+   Copyright 2021 Erigon contributors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package gointerfaces
+
+import (
+	"fmt"
+
+	"github.com/ledgerwatch/erigon-lib/gointerfaces/types"
+)
+
+type Version struct {
+	Major, Minor, Patch uint32 // interface Version of the client - to perform compatibility check when opening
+}
+
+func VersionFromProto(r *types.VersionReply) Version {
+	return Version{Major: r.Major, Minor: r.Minor, Patch: r.Patch}
+}
+
+// EnsureVersion - Default policy: allow only patch difference
+func EnsureVersion(local Version, remote *types.VersionReply) bool {
+	if remote.Major != local.Major {
+		return false
+	}
+	if remote.Minor != local.Minor {
+		return false
+	}
+	return true
+}
+
+func (v Version) String() string {
+	return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
+}