diff --git a/messages-cosmos.proto b/messages-cosmos.proto
new file mode 100644
index 0000000..df5f934
--- /dev/null
+++ b/messages-cosmos.proto
@@ -0,0 +1,62 @@
+syntax = "proto2";
+
+// Sugar for easier handling in Java
+option java_package = "com.keepkey.deviceprotocol";
+option java_outer_classname = "KeepKeyMessageCosmos";
+
+import "types.proto";
+
+/**
+ * Request: Address at the specified index
+ * @start
+ * @next CosmosAddress
+ */
+message CosmosGetAddress {
+    repeated uint32 address_n = 1;  // BIP-32 path. For compatibility with other wallets, must be m/44'/148'/index'
+    optional bool show_display = 2; // optionally show on display before sending the result
+}
+
+/**
+ * Response: Address for the given index
+ * @end
+ */
+message CosmosAddress {
+    optional string address = 1;    // Address Bech32 encoded with 'cosmos' prefix
+}
+
+/**
+ * Request: ask device to sign Cosmos transaction
+ * @start
+ * @next CosmosSignedTx
+ */
+message CosmosSignTx {
+    repeated uint32 address_n = 1;          // BIP-32 path. For compatibility with other wallets, must be m/44'/118'/index'
+    optional uint64 account_number = 2 [jstype = JS_STRING];
+    optional string chain_id = 3;
+    optional uint32 fee_amount = 4;
+    optional uint32 gas = 5;
+    optional string memo = 6;
+    optional uint64 sequence = 7 [jstype = JS_STRING];
+    optional uint32 msg_count = 8;
+}
+
+message CosmosMsgRequest {}
+
+message CosmosMsgAck {
+    optional CosmosMsgSend send = 1;
+}
+
+message CosmosMsgSend {
+    optional string from_address = 6;
+    optional string to_address = 7;
+    optional uint64 amount = 8 [jstype = JS_STRING];
+}
+
+/**
+ * Response: signature for transaction
+ * @end
+ */
+message CosmosSignedTx {
+    optional bytes public_key = 1;  // public key for the private key used to sign data
+    optional bytes signature = 2;   // signature suitable for sending to the Cosmos network
+}
diff --git a/messages.proto b/messages.proto
index f0ff527..2b85d0f 100644
--- a/messages.proto
+++ b/messages.proto
@@ -104,6 +104,13 @@ enum MessageType {
 	MessageType_NanoAddress = 701 [(wire_out) = true];
 	MessageType_NanoSignTx = 702 [(wire_in) = true];
 	MessageType_NanoSignedTx = 703 [(wire_out) = true];
+
+	MessageType_CosmosGetAddress = 900 [(wire_in) = true];
+	MessageType_CosmosAddress = 901 [(wire_out) = true];
+	MessageType_CosmosSignTx = 902 [(wire_in) = true];
+	MessageType_CosmosMsgRequest = 903 [(wire_out) = true];
+	MessageType_CosmosMsgAck = 904 [(wire_in) = true];
+	MessageType_CosmosSignedTx = 905 [(wire_out) = true];
 }
 
 ////////////////////
diff --git a/package.json b/package.json
index 51b71f4..534823b 100644
--- a/package.json
+++ b/package.json
@@ -8,8 +8,8 @@
   "scripts": {
     "clean": "rm -rf ./lib/*.js ./lib/*.ts",
     "build": "npm run build:js && npm run build:json && npm run build:postprocess",
-    "build:js": "protoc --plugin=protoc-gen-ts=./node_modules/.bin/protoc-gen-ts --js_out=import_style=commonjs,binary:./lib --ts_out=./lib exchange.proto types.proto messages.proto messages-eos.proto messages-nano.proto",
-    "build:json": "pbjs --keep-case -t json ./types.proto ./messages.proto ./messages-eos.proto ./messages-nano.proto ./exchange.proto > ./lib/proto.json",
+    "build:js": "protoc --plugin=protoc-gen-ts=./node_modules/.bin/protoc-gen-ts --js_out=import_style=commonjs,binary:./lib --ts_out=./lib exchange.proto types.proto messages.proto messages-eos.proto messages-nano.proto messages-cosmos.proto",
+    "build:json": "pbjs --keep-case -t json ./types.proto ./messages.proto ./messages-eos.proto ./messages-nano.proto ./messages-cosmos.proto ./exchange.proto > ./lib/proto.json",
     "build:postprocess": "find ./lib -name \"*.js\" -exec sed -i '' -e \"s/var global = Function(\\'return this\\')();/var global = (function(){ return this }).call(null);/g\" {} \\;",
     "test": "echo \"Error: no test specified\" && exit 1"
   },