diff --git a/gen/main.go b/gen/main.go
index a9bada5ff..e159465c6 100644
--- a/gen/main.go
+++ b/gen/main.go
@@ -10,6 +10,7 @@ import (
 	"github.com/filecoin-project/lotus/chain/blocksync"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/lib/statemachine"
+	"github.com/filecoin-project/lotus/node/hello"
 	"github.com/filecoin-project/lotus/paychmgr"
 	"github.com/filecoin-project/lotus/storage/sealing"
 )
@@ -82,4 +83,12 @@ func main() {
 		fmt.Printf("%+v\n", err)
 		os.Exit(1)
 	}
+
+	err = gen.WriteMapEncodersToFile("./node/hello/cbor_gen.go", "hello",
+		hello.Message{},
+	)
+	if err != nil {
+		fmt.Printf("%+v\n", err)
+		os.Exit(1)
+	}
 }
diff --git a/node/hello/cbor_gen.go b/node/hello/cbor_gen.go
new file mode 100644
index 000000000..27ddbd285
--- /dev/null
+++ b/node/hello/cbor_gen.go
@@ -0,0 +1,267 @@
+// Code generated by github.com/whyrusleeping/cbor-gen. DO NOT EDIT.
+
+package hello
+
+import (
+	"fmt"
+	"io"
+
+	cid "github.com/ipfs/go-cid"
+	cbg "github.com/whyrusleeping/cbor-gen"
+	xerrors "golang.org/x/xerrors"
+)
+
+var _ = xerrors.Errorf
+
+func (t *Message) MarshalCBOR(w io.Writer) error {
+	if t == nil {
+		_, err := w.Write(cbg.CborNull)
+		return err
+	}
+	if _, err := w.Write([]byte{165}); err != nil {
+		return err
+	}
+
+	// t.HeaviestTipSet ([]cid.Cid) (slice)
+	if len("HeaviestTipSet") > cbg.MaxLength {
+		return xerrors.Errorf("Value in field \"HeaviestTipSet\" was too long")
+	}
+
+	if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajTextString, uint64(len("HeaviestTipSet")))); err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("HeaviestTipSet")); err != nil {
+		return err
+	}
+
+	if len(t.HeaviestTipSet) > cbg.MaxLength {
+		return xerrors.Errorf("Slice value in field t.HeaviestTipSet was too long")
+	}
+
+	if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajArray, uint64(len(t.HeaviestTipSet)))); err != nil {
+		return err
+	}
+	for _, v := range t.HeaviestTipSet {
+		if err := cbg.WriteCid(w, v); err != nil {
+			return xerrors.Errorf("failed writing cid field t.HeaviestTipSet: %w", err)
+		}
+	}
+
+	// t.HeaviestTipSetWeight (big.Int) (struct)
+	if len("HeaviestTipSetWeight") > cbg.MaxLength {
+		return xerrors.Errorf("Value in field \"HeaviestTipSetWeight\" was too long")
+	}
+
+	if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajTextString, uint64(len("HeaviestTipSetWeight")))); err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("HeaviestTipSetWeight")); err != nil {
+		return err
+	}
+
+	if err := t.HeaviestTipSetWeight.MarshalCBOR(w); err != nil {
+		return err
+	}
+
+	// t.GenesisHash (cid.Cid) (struct)
+	if len("GenesisHash") > cbg.MaxLength {
+		return xerrors.Errorf("Value in field \"GenesisHash\" was too long")
+	}
+
+	if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajTextString, uint64(len("GenesisHash")))); err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("GenesisHash")); err != nil {
+		return err
+	}
+
+	if err := cbg.WriteCid(w, t.GenesisHash); err != nil {
+		return xerrors.Errorf("failed to write cid field t.GenesisHash: %w", err)
+	}
+
+	// t.TArrial (int64) (int64)
+	if len("TArrial") > cbg.MaxLength {
+		return xerrors.Errorf("Value in field \"TArrial\" was too long")
+	}
+
+	if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajTextString, uint64(len("TArrial")))); err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("TArrial")); err != nil {
+		return err
+	}
+
+	if t.TArrial >= 0 {
+		if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajUnsignedInt, uint64(t.TArrial))); err != nil {
+			return err
+		}
+	} else {
+		if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajNegativeInt, uint64(-t.TArrial)-1)); err != nil {
+			return err
+		}
+	}
+
+	// t.TSent (int64) (int64)
+	if len("TSent") > cbg.MaxLength {
+		return xerrors.Errorf("Value in field \"TSent\" was too long")
+	}
+
+	if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajTextString, uint64(len("TSent")))); err != nil {
+		return err
+	}
+	if _, err := w.Write([]byte("TSent")); err != nil {
+		return err
+	}
+
+	if t.TSent >= 0 {
+		if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajUnsignedInt, uint64(t.TSent))); err != nil {
+			return err
+		}
+	} else {
+		if _, err := w.Write(cbg.CborEncodeMajorType(cbg.MajNegativeInt, uint64(-t.TSent)-1)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (t *Message) UnmarshalCBOR(r io.Reader) error {
+	br := cbg.GetPeeker(r)
+
+	maj, extra, err := cbg.CborReadHeader(br)
+	if err != nil {
+		return err
+	}
+	if maj != cbg.MajMap {
+		return fmt.Errorf("cbor input should be of type map")
+	}
+
+	if extra > cbg.MaxLength {
+		return fmt.Errorf("Message: map struct too large (%d)", extra)
+	}
+
+	var name string
+	n := extra
+
+	for i := uint64(0); i < n; i++ {
+
+		{
+			sval, err := cbg.ReadString(br)
+			if err != nil {
+				return err
+			}
+
+			name = string(sval)
+		}
+
+		switch name {
+		// t.HeaviestTipSet ([]cid.Cid) (slice)
+		case "HeaviestTipSet":
+
+			maj, extra, err = cbg.CborReadHeader(br)
+			if err != nil {
+				return err
+			}
+
+			if extra > cbg.MaxLength {
+				return fmt.Errorf("t.HeaviestTipSet: array too large (%d)", extra)
+			}
+
+			if maj != cbg.MajArray {
+				return fmt.Errorf("expected cbor array")
+			}
+			if extra > 0 {
+				t.HeaviestTipSet = make([]cid.Cid, extra)
+			}
+			for i := 0; i < int(extra); i++ {
+
+				c, err := cbg.ReadCid(br)
+				if err != nil {
+					return xerrors.Errorf("reading cid field t.HeaviestTipSet failed: %w", err)
+				}
+				t.HeaviestTipSet[i] = c
+			}
+
+			// t.HeaviestTipSetWeight (big.Int) (struct)
+		case "HeaviestTipSetWeight":
+
+			{
+
+				if err := t.HeaviestTipSetWeight.UnmarshalCBOR(br); err != nil {
+					return err
+				}
+
+			}
+			// t.GenesisHash (cid.Cid) (struct)
+		case "GenesisHash":
+
+			{
+
+				c, err := cbg.ReadCid(br)
+				if err != nil {
+					return xerrors.Errorf("failed to read cid field t.GenesisHash: %w", err)
+				}
+
+				t.GenesisHash = c
+
+			}
+			// t.TArrial (int64) (int64)
+		case "TArrial":
+			{
+				maj, extra, err := cbg.CborReadHeader(br)
+				var extraI int64
+				if err != nil {
+					return err
+				}
+				switch maj {
+				case cbg.MajUnsignedInt:
+					extraI = int64(extra)
+					if extraI < 0 {
+						return fmt.Errorf("int64 positive overflow")
+					}
+				case cbg.MajNegativeInt:
+					extraI = int64(extra)
+					if extraI < 0 {
+						return fmt.Errorf("int64 negative oveflow")
+					}
+					extraI = -1 - extraI
+				default:
+					return fmt.Errorf("wrong type for int64 field: %d", maj)
+				}
+
+				t.TArrial = int64(extraI)
+			}
+			// t.TSent (int64) (int64)
+		case "TSent":
+			{
+				maj, extra, err := cbg.CborReadHeader(br)
+				var extraI int64
+				if err != nil {
+					return err
+				}
+				switch maj {
+				case cbg.MajUnsignedInt:
+					extraI = int64(extra)
+					if extraI < 0 {
+						return fmt.Errorf("int64 positive overflow")
+					}
+				case cbg.MajNegativeInt:
+					extraI = int64(extra)
+					if extraI < 0 {
+						return fmt.Errorf("int64 negative oveflow")
+					}
+					extraI = -1 - extraI
+				default:
+					return fmt.Errorf("wrong type for int64 field: %d", maj)
+				}
+
+				t.TSent = int64(extraI)
+			}
+
+		default:
+			return fmt.Errorf("unknown struct field %d: '%s'", i, name)
+		}
+	}
+
+	return nil
+}
diff --git a/node/hello/hello.go b/node/hello/hello.go
index 8dabd3de8..93df738bf 100644
--- a/node/hello/hello.go
+++ b/node/hello/hello.go
@@ -4,8 +4,8 @@ import (
 	"context"
 	"time"
 
+	"github.com/filecoin-project/specs-actors/actors/abi/big"
 	"github.com/ipfs/go-cid"
-	cbor "github.com/ipfs/go-ipld-cbor"
 	logging "github.com/ipfs/go-log/v2"
 	"github.com/libp2p/go-libp2p-core/host"
 	inet "github.com/libp2p/go-libp2p-core/network"
@@ -23,13 +23,9 @@ const ProtocolID = "/fil/hello/1.0.0"
 
 var log = logging.Logger("hello")
 
-func init() {
-	cbor.RegisterCborType(Message{})
-}
-
 type Message struct {
 	HeaviestTipSet       []cid.Cid
-	HeaviestTipSetWeight types.BigInt
+	HeaviestTipSetWeight big.Int
 	GenesisHash          cid.Cid
 
 	TArrial int64