diff --git a/docs/architecture/adr-020-protobuf-transaction-encoding.md b/docs/architecture/adr-020-protobuf-transaction-encoding.md
index be68187180..c3588aa05e 100644
--- a/docs/architecture/adr-020-protobuf-transaction-encoding.md
+++ b/docs/architecture/adr-020-protobuf-transaction-encoding.md
@@ -338,8 +338,6 @@ type TxBuilder interface {
   SetFee(sdk.Fee)
   GetMemo() string
   SetMemo(string)
-
-  CanonicalSignBytes(cid string, num, seq uint64) ([]byte, error)
 }
 ```
 
diff --git a/types/codec.go b/types/codec.go
index c00d95b2ee..f2bd9b22c8 100644
--- a/types/codec.go
+++ b/types/codec.go
@@ -1,8 +1,6 @@
 package types
 
 import (
-	jsonc "github.com/gibson042/canonicaljson-go"
-
 	"github.com/cosmos/cosmos-sdk/codec/types"
 
 	"github.com/cosmos/cosmos-sdk/codec"
@@ -18,25 +16,3 @@ func RegisterCodec(cdc *codec.Codec) {
 func RegisterInterfaces(registry types.InterfaceRegistry) {
 	registry.RegisterInterface("cosmos_sdk.v1.Msg", (*Msg)(nil))
 }
-
-// CanonicalSignBytes returns a canonical JSON encoding of a Proto message that
-// can be signed over. The JSON encoding ensures all field names adhere to their
-// Proto definition, default values are omitted, and follows the JSON Canonical
-// Form.
-func CanonicalSignBytes(msg codec.ProtoMarshaler) ([]byte, error) {
-	// first, encode via canonical Proto3 JSON
-	bz, err := codec.ProtoMarshalJSON(msg)
-	if err != nil {
-		return nil, err
-	}
-
-	genericJSON := make(map[string]interface{})
-
-	// decode canonical proto encoding into a generic map
-	if err := jsonc.Unmarshal(bz, &genericJSON); err != nil {
-		return nil, err
-	}
-
-	// finally, return the canonical JSON encoding via JSON Canonical Form
-	return jsonc.Marshal(genericJSON)
-}