diff --git a/lib/4nk/models/ChatData.ts b/lib/4nk/models/ChatData.ts
new file mode 100644
index 0000000..de54568
--- /dev/null
+++ b/lib/4nk/models/ChatData.ts
@@ -0,0 +1,92 @@
+import type { RoleDefinition } from "./Roles";
+
+export interface ChatData {
+  type: string;
+  content: string;
+  metadata: {
+    createdAt: string;
+    lastModified: string;
+    sender: string;
+    recipient: string;
+  };
+}
+
+export function isChatData(data: any): data is ChatData {
+  if (typeof data !== 'object' || data === null) return false;
+
+  // Check required fields
+  if (typeof data.type !== 'string' || typeof data.content !== 'string') {
+    return false;
+  }
+
+  const validTypes = ['text'];
+  if (!validTypes.includes(data.type)) {
+    return false;
+  }
+
+  // Check metadata structure
+  if (typeof data.metadata !== 'object' || data.metadata === null) {
+    return false;
+  }
+
+  const requiredMetadataFields = ['createdAt', 'lastModified', 'sender', 'recipient'];
+  for (const field of requiredMetadataFields) {
+    if (typeof data.metadata[field] !== 'string') {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+const emptyChatData: ChatData = {
+  type: '',
+  content: '',
+  metadata: {
+    createdAt: '',
+    lastModified: '',
+    sender: '',
+    recipient: '',
+  }
+};
+
+const chatDataFields: string[] = Object.keys(emptyChatData);
+
+const ChatPublicFields: string[] = [];
+
+// Messages and metadata are private by default
+export const ChatPrivateFields = [
+  ...chatDataFields.filter(key => !ChatPublicFields.includes(key))
+];
+
+export interface ChatCreated {
+  processId: string,
+  process: any, // Process
+  data: ChatData,
+}
+
+export function setDefaultChatRoles(ownerId: string, recipientId: string): Record<string, RoleDefinition> {
+  return {
+    demiurge: {
+      members: [ownerId, recipientId],
+      validation_rules: [],
+      storages: []
+    },
+    owner: {
+      members: [ownerId, recipientId],
+      validation_rules: [
+        {
+          quorum: 0.5,
+          fields: [...chatDataFields, 'roles'],
+          min_sig_member: 1,
+        },
+      ],
+      storages: []
+    },
+    apophis: {
+      members: [ownerId, recipientId],
+      validation_rules: [],
+      storages: []
+    }
+  }
+};