diff --git a/protos/googleauth.proto b/protos/googleauth.proto
new file mode 100644
index 0000000000..5a449c63e7
--- /dev/null
+++ b/protos/googleauth.proto
@@ -0,0 +1,40 @@
+syntax = "proto3";
+package googleauth;
+
+message MigrationPayload {
+  enum Algorithm {
+    ALGORITHM_UNSPECIFIED = 0;
+    ALGORITHM_SHA1 = 1;
+    ALGORITHM_SHA256 = 2;
+    ALGORITHM_SHA512 = 3;
+    ALGORITHM_MD5 = 4;
+  }
+
+  enum DigitCount {
+    DIGIT_COUNT_UNSPECIFIED = 0;
+    DIGIT_COUNT_SIX = 1;
+    DIGIT_COUNT_EIGHT = 2;
+  }
+
+  enum OtpType {
+    OTP_TYPE_UNSPECIFIED = 0;
+    OTP_TYPE_HOTP = 1;
+    OTP_TYPE_TOTP = 2;
+  }
+
+  message OtpParameters {
+    bytes secret = 1;
+    string name = 2;
+    string issuer = 3;
+    Algorithm algorithm = 4;
+    DigitCount digits = 5;
+    OtpType type = 6;
+    int64 counter = 7;
+  }
+
+  repeated OtpParameters otp_parameters = 1;
+  int32 version = 2;
+  int32 batch_size = 3;
+  int32 batch_index = 4;
+  int32 batch_id = 5;
+}
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