diff --git a/types/part_set.go b/types/part_set.go
index f132c5fe6..ade421450 100644
--- a/types/part_set.go
+++ b/types/part_set.go
@@ -74,7 +74,15 @@ func (psh PartSetHeader) Equals(other PartSetHeader) bool {
 }
 
 func (psh PartSetHeader) WriteSignBytes(w io.Writer, n *int, err *error) {
-	wire.WriteTo([]byte(Fmt(`{"hash":"%X","total":%v}`, psh.Hash, psh.Total)), w, n, err)
+	wire.WriteJSON(
+		struct {
+			Hash  []byte `json:"hash"`
+			Total int    `json:"total"`
+		}{
+			psh.Hash,
+			psh.Total,
+		},
+		w, n, err)
 }
 
 //-------------------------------------
diff --git a/types/proposal.go b/types/proposal.go
index 85ac5f061..91e53038f 100644
--- a/types/proposal.go
+++ b/types/proposal.go
@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"io"
 
-	. "github.com/tendermint/go-common"
+	//. "github.com/tendermint/go-common"
 	"github.com/tendermint/go-crypto"
 	"github.com/tendermint/go-wire"
 )
@@ -16,12 +16,12 @@ var (
 )
 
 type Proposal struct {
-	Height           int                     `json:"height"`
-	Round            int                     `json:"round"`
-	BlockPartsHeader PartSetHeader           `json:"block_parts_header"`
-	POLRound         int                     `json:"pol_round"`    // -1 if null.
-	POLBlockID       BlockID                 `json:"pol_block_id"` // zero if null.
-	Signature        crypto.SignatureEd25519 `json:"signature"`
+	Height           int              `json:"height"`
+	Round            int              `json:"round"`
+	BlockPartsHeader PartSetHeader    `json:"block_parts_header"`
+	POLRound         int              `json:"pol_round"`    // -1 if null.
+	POLBlockID       BlockID          `json:"pol_block_id"` // zero if null.
+	Signature        crypto.Signature `json:"signature"`
 }
 
 // polRound: -1 if no polRound.
@@ -41,11 +41,32 @@ func (p *Proposal) String() string {
 }
 
 func (p *Proposal) WriteSignBytes(chainID string, w io.Writer, n *int, err *error) {
-	wire.WriteTo([]byte(Fmt(`{"chain_id":"%s"`, chainID)), w, n, err)
-	wire.WriteTo([]byte(`,"proposal":{"block_parts_header":`), w, n, err)
-	p.BlockPartsHeader.WriteSignBytes(w, n, err)
-	wire.WriteTo([]byte(Fmt(`,"height":%v,"pol_block_id":`, p.Height)), w, n, err)
-	p.POLBlockID.WriteSignBytes(w, n, err)
-	wire.WriteTo([]byte(Fmt(`,"pol_round":%v`, p.POLRound)), w, n, err)
-	wire.WriteTo([]byte(Fmt(`,"round":%v}}`, p.Round)), w, n, err)
+
+	wire.WriteJSON(
+		struct {
+			ChainID  string `json:"chain_id"`
+			Proposal struct {
+				BlockPartsHeader PartSetHeader `json:"block_parts_header"`
+				Height           int           `json:"height"`
+				POLBlockID       BlockID       `json:"pol_block_id"`
+				POLRound         int           `json:"pol_round"`
+				Round            int           `json:"round"`
+			} `json:"proposal"`
+		}{
+			chainID,
+			struct {
+				BlockPartsHeader PartSetHeader `json:"block_parts_header"`
+				Height           int           `json:"height"`
+				POLBlockID       BlockID       `json:"pol_block_id"`
+				POLRound         int           `json:"pol_round"`
+				Round            int           `json:"round"`
+			}{
+				p.BlockPartsHeader,
+				p.Height,
+				p.POLBlockID,
+				p.POLRound,
+				p.Round,
+			},
+		},
+		w, n, err)
 }
diff --git a/types/vote.go b/types/vote.go
index 92d99f485..e95008639 100644
--- a/types/vote.go
+++ b/types/vote.go
@@ -57,10 +57,40 @@ type Vote struct {
 }
 
 func (vote *Vote) WriteSignBytes(chainID string, w io.Writer, n *int, err *error) {
-	wire.WriteTo([]byte(Fmt(`{"chain_id":"%s"`, chainID)), w, n, err)
-	wire.WriteTo([]byte(`,"vote":{"block_id":`), w, n, err)
-	vote.BlockID.WriteSignBytes(w, n, err)
-	wire.WriteTo([]byte(Fmt(`,"height":%v,"round":%v,"type":%v}}`, vote.Height, vote.Round, vote.Type)), w, n, err)
+
+	wire.WriteJSON(
+		struct {
+			ChainID string `json:"chain_id"`
+			Vote    struct {
+				BlockID          BlockID          `json:"block_id"`
+				Height           int              `json:"height"`
+				Round            int              `json:"round"`
+				Signature        crypto.Signature `json:"signature"`
+				Type             byte             `json:"type"`
+				ValidatorAddress []byte           `json:"validator_address"`
+				ValidatorIndex   int              `json:"validator_index"`
+			} `json: "vote"`
+		}{
+			chainID,
+			struct {
+				BlockID          BlockID          `json:"block_id"`
+				Height           int              `json:"height"`
+				Round            int              `json:"round"`
+				Signature        crypto.Signature `json:"signature"`
+				Type             byte             `json:"type"`
+				ValidatorAddress []byte           `json:"validator_address"`
+				ValidatorIndex   int              `json:"validator_index"`
+			}{
+				vote.BlockID,
+				vote.Height,
+				vote.Round,
+				vote.Signature,
+				vote.Type,
+				vote.ValidatorAddress,
+				vote.ValidatorIndex,
+			},
+		},
+		w, n, err)
 }
 
 func (vote *Vote) Copy() *Vote {