diff --git a/packages/fabric/core/src/domain/entity/files/image-file.ts b/packages/fabric/core/src/domain/entity/files/image-file.ts
index e92aaba..66a17c8 100644
--- a/packages/fabric/core/src/domain/entity/files/image-file.ts
+++ b/packages/fabric/core/src/domain/entity/files/image-file.ts
@@ -1,9 +1,9 @@
 import { ImageMimeType } from "../../../files/mime-type.js";
-import { DomainFile } from "./domain-file.js";
+import { StoredFile } from "./stored-file.js";
 
 /**
  * Represents an image file.
  */
-export interface ImageFile extends DomainFile {
+export interface ImageFile extends StoredFile {
   mimeType: ImageMimeType;
 }
diff --git a/packages/fabric/core/src/domain/entity/files/index.ts b/packages/fabric/core/src/domain/entity/files/index.ts
index dad6bbf..ebe3117 100644
--- a/packages/fabric/core/src/domain/entity/files/index.ts
+++ b/packages/fabric/core/src/domain/entity/files/index.ts
@@ -1,2 +1,2 @@
-export * from "./domain-file.js";
 export * from "./image-file.js";
+export * from "./stored-file.js";
diff --git a/packages/fabric/core/src/domain/entity/files/domain-file.ts b/packages/fabric/core/src/domain/entity/files/stored-file.ts
similarity index 75%
rename from packages/fabric/core/src/domain/entity/files/domain-file.ts
rename to packages/fabric/core/src/domain/entity/files/stored-file.ts
index 74a36ca..4ed5ff1 100644
--- a/packages/fabric/core/src/domain/entity/files/domain-file.ts
+++ b/packages/fabric/core/src/domain/entity/files/stored-file.ts
@@ -4,6 +4,6 @@ import { Entity } from "../entity.js";
 /**
  * Represents a file as managed by the domain.
  */
-export interface DomainFile extends BaseFile, Entity {
+export interface StoredFile extends BaseFile, Entity {
   url: string;
 }
diff --git a/packages/fabric/core/src/domain/events/event.ts b/packages/fabric/core/src/domain/events/event.ts
index 05b78da..22d0ac5 100644
--- a/packages/fabric/core/src/domain/events/event.ts
+++ b/packages/fabric/core/src/domain/events/event.ts
@@ -1,4 +1,5 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
+import { PosixDate } from "../../time/posix-date.js";
 import { TaggedVariant } from "../../variant/variant.js";
 import { UUID } from "../types/uuid.js";
 
@@ -10,3 +11,12 @@ export interface Event<TTag extends string = string, TPayload = any>
   streamId: UUID;
   payload: TPayload;
 }
+
+/**
+ * A stored event is an inmutable event, already stored, with it's version in the stream and timestamp.
+ */
+export interface StoredEvent<TTag extends string = string, TPayload = any>
+  extends Readonly<Event<TTag, TPayload>> {
+  readonly version: number;
+  readonly timestamp: PosixDate;
+}
diff --git a/packages/fabric/core/src/domain/use-case/use-case-definition.ts b/packages/fabric/core/src/domain/use-case/use-case-definition.ts
index c16f76e..85c35dd 100644
--- a/packages/fabric/core/src/domain/use-case/use-case-definition.ts
+++ b/packages/fabric/core/src/domain/use-case/use-case-definition.ts
@@ -25,11 +25,6 @@ interface BasicUseCaseDefinition<
    */
   isAuthRequired: boolean;
 
-  /**
-   * The required permissions to execute the use case.
-   **/
-  requiredPermissions?: string[];
-
   /**
    * The use case function.
    */
diff --git a/packages/fabric/core/src/files/uploaded-file.ts b/packages/fabric/core/src/files/in-memory-file.ts
similarity index 100%
rename from packages/fabric/core/src/files/uploaded-file.ts
rename to packages/fabric/core/src/files/in-memory-file.ts
diff --git a/packages/fabric/core/src/files/index.ts b/packages/fabric/core/src/files/index.ts
index ed4ec55..3468cb7 100644
--- a/packages/fabric/core/src/files/index.ts
+++ b/packages/fabric/core/src/files/index.ts
@@ -1,8 +1,8 @@
 export * from "./base-file.js";
 export * from "./bytes.js";
+export * from "./in-memory-file.js";
 export * from "./invalid-file-type-error.js";
+export * from "./is-in-memory-file.js";
 export * from "./is-mime-type.js";
-export * from "./is-uploaded-file.js";
 export * from "./media-file.js";
 export * from "./mime-type.js";
-export * from "./uploaded-file.js";
diff --git a/packages/fabric/core/src/files/is-uploaded-file.ts b/packages/fabric/core/src/files/is-in-memory-file.ts
similarity index 92%
rename from packages/fabric/core/src/files/is-uploaded-file.ts
rename to packages/fabric/core/src/files/is-in-memory-file.ts
index 18556df..3adfc31 100644
--- a/packages/fabric/core/src/files/is-uploaded-file.ts
+++ b/packages/fabric/core/src/files/is-in-memory-file.ts
@@ -1,6 +1,6 @@
 import validator from "validator";
 import { isRecord } from "../record/is-record.js";
-import { InMemoryFile } from "./uploaded-file.js";
+import { InMemoryFile } from "./in-memory-file.js";
 
 const { isBase64, isMimeType } = validator;
 
diff --git a/packages/fabric/core/src/files/media-file.ts b/packages/fabric/core/src/files/media-file.ts
index edf0b82..5c86a4e 100644
--- a/packages/fabric/core/src/files/media-file.ts
+++ b/packages/fabric/core/src/files/media-file.ts
@@ -1,8 +1,8 @@
-import { DomainFile } from "../domain/entity/files/domain-file.js";
+import { StoredFile } from "../domain/entity/files/stored-file.js";
 
 /**
  * Represents a media file, either an image, a video or an audio file.
  */
-export interface MediaFile extends DomainFile {
+export interface MediaFile extends StoredFile {
   mimeType: `image/${string}` | `video/${string}` | `audio/${string}`;
 }
diff --git a/packages/fabric/core/src/result/result.ts b/packages/fabric/core/src/result/result.ts
index 48ee32f..a7c8d7f 100644
--- a/packages/fabric/core/src/result/result.ts
+++ b/packages/fabric/core/src/result/result.ts
@@ -1,9 +1,11 @@
 import { TaggedError } from "../error/tagged-error.js";
+import { UnexpectedError } from "../error/unexpected-error.js";
 
 /**
  * Un Result representa el resultado de una operación
  * que puede ser un valor de tipo `TValue` o un error `TError`.
  */
-export type Result<TValue, TError extends TaggedError<string>> =
-  | TValue
-  | TError;
+export type Result<
+  TValue,
+  TError extends TaggedError<string> = UnexpectedError,
+> = TValue | TError;