diff --git a/types/molecule/offchain_type.go b/types/molecule/offchain_type.go
new file mode 100644
index 00000000..6b019099
--- /dev/null
+++ b/types/molecule/offchain_type.go
@@ -0,0 +1,216 @@
+package molecule
+
+import (
+	"bytes"
+	"errors"
+	"strconv"
+	"strings"
+)
+
+type OffChainParticipantBuilder struct {
+	pub_key              SEC1EncodedPubKey
+	payment_script       Script
+	unlock_script        Script
+	payment_min_capacity Uint64
+}
+
+func (s *OffChainParticipantBuilder) Build() OffChainParticipant {
+	b := new(bytes.Buffer)
+
+	totalSize := HeaderSizeUint * (4 + 1)
+	offsets := make([]uint32, 0, 4)
+
+	offsets = append(offsets, totalSize)
+	totalSize += uint32(len(s.pub_key.AsSlice()))
+	offsets = append(offsets, totalSize)
+	totalSize += uint32(len(s.payment_script.AsSlice()))
+	offsets = append(offsets, totalSize)
+	totalSize += uint32(len(s.unlock_script.AsSlice()))
+	offsets = append(offsets, totalSize)
+	totalSize += uint32(len(s.payment_min_capacity.AsSlice()))
+
+	b.Write(packNumber(Number(totalSize)))
+
+	for i := 0; i < len(offsets); i++ {
+		b.Write(packNumber(Number(offsets[i])))
+	}
+
+	b.Write(s.pub_key.AsSlice())
+	b.Write(s.payment_script.AsSlice())
+	b.Write(s.unlock_script.AsSlice())
+	b.Write(s.payment_min_capacity.AsSlice())
+	return OffChainParticipant{inner: b.Bytes()}
+}
+
+func (s *OffChainParticipantBuilder) PubKey(v SEC1EncodedPubKey) *OffChainParticipantBuilder {
+	s.pub_key = v
+	return s
+}
+
+func (s *OffChainParticipantBuilder) PaymentScript(v Script) *OffChainParticipantBuilder {
+	s.payment_script = v
+	return s
+}
+
+func (s *OffChainParticipantBuilder) UnlockScript(v Script) *OffChainParticipantBuilder {
+	s.unlock_script = v
+	return s
+}
+
+func (s *OffChainParticipantBuilder) PaymentMinCapacity(v Uint64) *OffChainParticipantBuilder {
+	s.payment_min_capacity = v
+	return s
+}
+
+func NewOffChainParticipantBuilder() *OffChainParticipantBuilder {
+	return &OffChainParticipantBuilder{pub_key: SEC1EncodedPubKeyDefault(), payment_script: ScriptDefault(), unlock_script: ScriptDefault(), payment_min_capacity: Uint64Default()}
+}
+
+type OffChainParticipant struct {
+	inner []byte
+}
+
+func OffChainParticipantFromSliceUnchecked(slice []byte) *OffChainParticipant {
+	return &OffChainParticipant{inner: slice}
+}
+func (s *OffChainParticipant) AsSlice() []byte {
+	return s.inner
+}
+
+func OffChainParticipantDefault() OffChainParticipant {
+	return *OffChainParticipantFromSliceUnchecked([]byte{167, 0, 0, 0, 20, 0, 0, 0, 53, 0, 0, 0, 106, 0, 0, 0, 159, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 53, 0, 0, 0, 16, 0, 0, 0, 48, 0, 0, 0, 49, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 53, 0, 0, 0, 16, 0, 0, 0, 48, 0, 0, 0, 49, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
+}
+
+func OffChainParticipantFromSlice(slice []byte, compatible bool) (*OffChainParticipant, error) {
+	sliceLen := len(slice)
+	if uint32(sliceLen) < HeaderSizeUint {
+		errMsg := strings.Join([]string{"HeaderIsBroken", "OffChainParticipant", strconv.Itoa(int(sliceLen)), "<", strconv.Itoa(int(HeaderSizeUint))}, " ")
+		return nil, errors.New(errMsg)
+	}
+
+	totalSize := unpackNumber(slice)
+	if Number(sliceLen) != totalSize {
+		errMsg := strings.Join([]string{"TotalSizeNotMatch", "OffChainParticipant", strconv.Itoa(int(sliceLen)), "!=", strconv.Itoa(int(totalSize))}, " ")
+		return nil, errors.New(errMsg)
+	}
+
+	if uint32(sliceLen) < HeaderSizeUint*2 {
+		errMsg := strings.Join([]string{"TotalSizeNotMatch", "OffChainParticipant", strconv.Itoa(int(sliceLen)), "<", strconv.Itoa(int(HeaderSizeUint * 2))}, " ")
+		return nil, errors.New(errMsg)
+	}
+
+	offsetFirst := unpackNumber(slice[HeaderSizeUint:])
+	if uint32(offsetFirst)%HeaderSizeUint != 0 || uint32(offsetFirst) < HeaderSizeUint*2 {
+		errMsg := strings.Join([]string{"OffsetsNotMatch", "OffChainParticipant", strconv.Itoa(int(offsetFirst % 4)), "!= 0", strconv.Itoa(int(offsetFirst)), "<", strconv.Itoa(int(HeaderSizeUint * 2))}, " ")
+		return nil, errors.New(errMsg)
+	}
+
+	if sliceLen < int(offsetFirst) {
+		errMsg := strings.Join([]string{"HeaderIsBroken", "OffChainParticipant", strconv.Itoa(int(sliceLen)), "<", strconv.Itoa(int(offsetFirst))}, " ")
+		return nil, errors.New(errMsg)
+	}
+
+	fieldCount := uint32(offsetFirst)/HeaderSizeUint - 1
+	if fieldCount < 4 {
+		return nil, errors.New("FieldCountNotMatch")
+	} else if !compatible && fieldCount > 4 {
+		return nil, errors.New("FieldCountNotMatch")
+	}
+
+	offsets := make([]uint32, fieldCount)
+
+	for i := 0; i < int(fieldCount); i++ {
+		offsets[i] = uint32(unpackNumber(slice[HeaderSizeUint:][int(HeaderSizeUint)*i:]))
+	}
+	offsets = append(offsets, uint32(totalSize))
+
+	for i := 0; i < len(offsets); i++ {
+		if i&1 != 0 && offsets[i-1] > offsets[i] {
+			return nil, errors.New("OffsetsNotMatch")
+		}
+	}
+
+	var err error
+
+	_, err = SEC1EncodedPubKeyFromSlice(slice[offsets[0]:offsets[1]], compatible)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = ScriptFromSlice(slice[offsets[1]:offsets[2]], compatible)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = ScriptFromSlice(slice[offsets[2]:offsets[3]], compatible)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = Uint64FromSlice(slice[offsets[3]:offsets[4]], compatible)
+	if err != nil {
+		return nil, err
+	}
+
+	return &OffChainParticipant{inner: slice}, nil
+}
+
+func (s *OffChainParticipant) TotalSize() uint {
+	return uint(unpackNumber(s.inner))
+}
+func (s *OffChainParticipant) FieldCount() uint {
+	var number uint = 0
+	if uint32(s.TotalSize()) == HeaderSizeUint {
+		return number
+	}
+	number = uint(unpackNumber(s.inner[HeaderSizeUint:]))/4 - 1
+	return number
+}
+func (s *OffChainParticipant) Len() uint {
+	return s.FieldCount()
+}
+func (s *OffChainParticipant) IsEmpty() bool {
+	return s.Len() == 0
+}
+func (s *OffChainParticipant) CountExtraFields() uint {
+	return s.FieldCount() - 4
+}
+
+func (s *OffChainParticipant) HasExtraFields() bool {
+	return 4 != s.FieldCount()
+}
+
+func (s *OffChainParticipant) PubKey() *SEC1EncodedPubKey {
+	start := unpackNumber(s.inner[4:])
+	end := unpackNumber(s.inner[8:])
+	return SEC1EncodedPubKeyFromSliceUnchecked(s.inner[start:end])
+}
+
+func (s *OffChainParticipant) PaymentScript() *Script {
+	start := unpackNumber(s.inner[8:])
+	end := unpackNumber(s.inner[12:])
+	return ScriptFromSliceUnchecked(s.inner[start:end])
+}
+
+func (s *OffChainParticipant) UnlockScript() *Script {
+	start := unpackNumber(s.inner[12:])
+	end := unpackNumber(s.inner[16:])
+	return ScriptFromSliceUnchecked(s.inner[start:end])
+}
+
+func (s *OffChainParticipant) PaymentMinCapacity() *Uint64 {
+	var ret *Uint64
+	start := unpackNumber(s.inner[16:])
+	if s.HasExtraFields() {
+		end := unpackNumber(s.inner[20:])
+		ret = Uint64FromSliceUnchecked(s.inner[start:end])
+	} else {
+		ret = Uint64FromSliceUnchecked(s.inner[start:])
+	}
+	return ret
+}
+
+func (s *OffChainParticipant) AsBuilder() OffChainParticipantBuilder {
+	ret := NewOffChainParticipantBuilder().PubKey(*s.PubKey()).PaymentScript(*s.PaymentScript()).UnlockScript(*s.UnlockScript()).PaymentMinCapacity(*s.PaymentMinCapacity())
+	return *ret
+}