diff --git a/types/protobuf.go b/types/protobuf.go
index e7ae20e3..828294d8 100644
--- a/types/protobuf.go
+++ b/types/protobuf.go
@@ -1,7 +1,11 @@
 package types
 
 import (
+	"fmt"
+	"reflect"
+
 	"github.com/tendermint/abci/types"
+	crypto "github.com/tendermint/go-crypto"
 )
 
 // TM2PB is used for converting Tendermint types to protobuf types.
@@ -12,38 +16,39 @@ type tm2pb struct{}
 
 func (tm2pb) Header(header *Header) types.Header {
 	return types.Header{
-		ChainID:        header.ChainID,
-		Height:         header.Height,
-		Time:           header.Time.Unix(),
-		NumTxs:         int32(header.NumTxs), // XXX: overflow
-		LastBlockID:    TM2PB.BlockID(header.LastBlockID),
-		LastCommitHash: header.LastCommitHash,
-		DataHash:       header.DataHash,
-		AppHash:        header.AppHash,
-	}
-}
-
-func (tm2pb) BlockID(blockID BlockID) types.BlockID {
-	return types.BlockID{
-		Hash:  blockID.Hash,
-		Parts: TM2PB.PartSetHeader(blockID.PartsHeader),
-	}
-}
-
-func (tm2pb) PartSetHeader(partSetHeader PartSetHeader) types.PartSetHeader {
-	return types.PartSetHeader{
-		Total: int32(partSetHeader.Total), // XXX: overflow
-		Hash:  partSetHeader.Hash,
+		ChainId:       header.ChainID,
+		Height:        header.Height,
+		Time:          header.Time.Unix(),
+		NumTxs:        int32(header.NumTxs), // XXX: overflow
+		LastBlockHash: header.LastBlockID.Hash,
+		AppHash:       header.AppHash,
 	}
 }
 
 func (tm2pb) Validator(val *Validator) types.Validator {
 	return types.Validator{
-		PubKey: val.PubKey.Bytes(),
+		PubKey: TM2PB.PubKey(val.PubKey),
 		Power:  val.VotingPower,
 	}
 }
 
+func (tm2pb) PubKey(pubKey crypto.PubKey) *types.PubKey {
+	switch pk := pubKey.(type) {
+	case crypto.PubKeyEd25519:
+		return &types.PubKey{
+			Type: "ed25519",
+			Data: pk[:],
+		}
+	case crypto.PubKeySecp256k1:
+		return &types.PubKey{
+			Type: "secp256k1",
+			Data: pk[:],
+		}
+	default:
+		panic(fmt.Sprintf("unknown pubkey type: %v %v", pubKey, reflect.TypeOf(pubKey)))
+	}
+}
+
 func (tm2pb) Validators(vals *ValidatorSet) []types.Validator {
 	validators := make([]types.Validator, len(vals.Validators))
 	for i, val := range vals.Validators {