diff --git a/Registry.sol b/Registry.sol
index 9d6a9e1..ccc1bb6 100644
--- a/Registry.sol
+++ b/Registry.sol
@@ -5,6 +5,11 @@ pragma solidity >=0.6.12;
 // File-version: 1
 
 
-interface RegistryClient {
-	function addressOf(address) external view returns (address);
+interface Registry {
+	function owner() external view returns (address);
+	function identifiers() external view returns (bytes32[] memory);
+	function chainOf(bytes32 _identifier) external view returns (bytes32);
+	function configSumOf(bytes32 _chain) external view returns (bytes32);
+	function set (bytes32 _identifier, address _address, bytes32 _chainDescriptor, bytes32 _chainConfig) external returns (bool);
+	function seal() external returns (bool);
 }
diff --git a/util/mergeabis.py b/util/mergeabis.py
new file mode 100644
index 0000000..d7608ad
--- /dev/null
+++ b/util/mergeabis.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+import sys
+import json
+
+merged = []
+for a in sys.argv[1:]:
+    f = open(a, 'r')
+    j = json.load(f)
+    f.close()
+    merged += j
+
+print(json.dumps(merged))