diff --git a/src/sdk/models/FolderData.ts b/src/sdk/models/FolderData.ts
index 134fbfe..475772b 100644
--- a/src/sdk/models/FolderData.ts
+++ b/src/sdk/models/FolderData.ts
@@ -1,3 +1,5 @@
+import type { RoleDefinition } from "./Roles";
+
 export interface FolderData {
   folderNumber: string;
   name: string;
@@ -13,8 +15,109 @@ export interface FolderData {
   stakeholders: string[];
 }
 
+export function isFolderData(data: any): data is FolderData {
+  if (typeof data !== 'object' || data === null) return false;
+
+  const requiredStringFields = [
+    'folderNumber',
+    'name',
+    'deedType',
+    'description',
+    'archived_description',
+    'status',
+    'created_at',
+    'updated_at'
+  ];
+
+  for (const field of requiredStringFields) {
+    if (typeof data[field] !== 'string') return false;
+  }
+
+  const requiredArrayFields = [
+    'customers',
+    'documents',
+    'motes',
+    'stakeholders'
+  ];
+
+  for (const field of requiredArrayFields) {
+    if (!Array.isArray(data[field]) || !data[field].every((item: any) => typeof item === 'string')) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+const emptyFolderData: FolderData = {
+  folderNumber: '',
+  name: '',
+  deedType: '',
+  description: '',
+  archived_description: '',
+  status: '',
+  created_at: '',
+  updated_at: '',
+  customers: [],
+  documents: [],
+  motes: [],
+  stakeholders: []
+};
+
+const folderDataFields: string[] = Object.keys(emptyFolderData);
+
+const FolderPublicFields: string[] = [];
+
+// All the attributes are private in that case
+export const FolderPrivateFields = [
+  ...folderDataFields.filter(key => !FolderPublicFields.includes(key))
+];
+
 export interface FolderCreated {
   processId: string,
   process: any, // Process
   folderData: FolderData,
 }
+
+export function setDefaultFolderRoles(ownerId: string, stakeholdersId: string[], customersId: string[]): Record<string, RoleDefinition> {
+  return {
+    owner: {
+      members: [ownerId],
+      validation_rules: [
+        {
+          quorum: 0.5,
+          fields: [...folderDataFields, 'roles'],
+          min_sig_member: 1,
+        },
+      ],
+      storages: []
+    },
+    stakeholders: {
+      members: stakeholdersId,
+      validation_rules: [
+        {
+          quorum: 0.5,
+          fields: ['documents', 'motes'],
+          min_sig_member: 1,
+        },
+      ],
+      storages: []
+    },
+    customers: {
+      members: customersId,
+      validation_rules: [
+        {
+          quorum: 0.0,
+          fields: folderDataFields,
+          min_sig_member: 0.0,
+        },
+      ],
+      storages: []
+    },
+    apophis: {
+      members: [ownerId],
+      validation_rules: [],
+      storages: []
+    }
+  }
+};
diff --git a/src/sdk/models/Roles.ts b/src/sdk/models/Roles.ts
new file mode 100644
index 0000000..7e22077
--- /dev/null
+++ b/src/sdk/models/Roles.ts
@@ -0,0 +1,11 @@
+export interface ValidationRule {
+    quorum: number,
+    fields: string[],
+    min_sig_member: number,
+}
+
+export interface RoleDefinition {
+  members: string[],
+  validation_rules: ValidationRule[],
+  storages: string[]
+}