diff --git a/rpc.proto b/rpc.proto
new file mode 100644
index 0000000..2ae2ef2
--- /dev/null
+++ b/rpc.proto
@@ -0,0 +1,78 @@
+// Borrowed from https://github.com/libp2p/go-libp2p-pubsub/blob/master/pb/rpc.proto
+
+syntax = "proto2";
+
+package pubsub.pb;
+
+message RPC {
+	repeated SubOpts subscriptions = 1;
+	repeated Message publish = 2;
+
+	message SubOpts {
+		optional bool subscribe = 1; // subscribe or unsubcribe
+		optional string topicid = 2;
+	}
+
+	optional ControlMessage control = 3;
+}
+
+message Message {
+	optional bytes from = 1;
+	optional bytes data = 2;
+	optional bytes seqno = 3;
+	repeated string topicIDs = 4;
+	optional bytes signature = 5;
+	optional bytes key = 6;
+}
+
+message ControlMessage {
+	repeated ControlIHave ihave = 1;
+	repeated ControlIWant iwant = 2;
+	repeated ControlGraft graft = 3;
+	repeated ControlPrune prune = 4;
+}
+
+message ControlIHave {
+	optional string topicID = 1;
+	repeated string messageIDs = 2;
+}
+
+message ControlIWant {
+	repeated string messageIDs = 1;
+}
+
+message ControlGraft {
+	optional string topicID = 1;
+}
+
+message ControlPrune {
+	optional string topicID = 1;
+}
+
+message TopicDescriptor {
+	optional string name = 1;
+	optional AuthOpts auth = 2;
+	optional EncOpts enc = 3;
+
+	message AuthOpts {
+		optional AuthMode mode = 1;
+		repeated bytes keys = 2; // root keys to trust
+
+		enum AuthMode {
+			NONE = 0; // no authentication, anyone can publish
+			KEY = 1; // only messages signed by keys in the topic descriptor are accepted
+			WOT = 2; // web of trust, certificates can allow publisher set to grow
+		}
+	}
+
+	message EncOpts {
+		optional EncMode mode = 1;
+		repeated bytes keyHashes = 2; // the hashes of the shared keys used (salted)
+
+		enum EncMode {
+			NONE = 0; // no encryption, anyone can read
+			SHAREDKEY = 1; // messages are encrypted with shared key
+			WOT = 2; // web of trust, certificates can allow publisher set to grow
+		}
+	}
+}
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