diff --git a/warehouse/Store.go b/warehouse/Store.go
index 33187e2..16fe03d 100644
--- a/warehouse/Store.go
+++ b/warehouse/Store.go
@@ -7,9 +7,9 @@ Author:     Peter Kleissner
 package warehouse
 
 import (
-	"encoding/hex"
 	"io"
 	"os"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -34,7 +34,7 @@ const (
 // CreateFile creates a new file in the warehouse
 func (wh *Warehouse) CreateFile(data io.Reader) (hash []byte, status int, err error) {
 	// create a temporary file to hold the body content
-	tmpFile, err := wh.TempFile()
+	tmpFile, err := wh.tempFile()
 	if err != nil {
 		return nil, StatusErrorCreateTempFile, err
 	}
@@ -60,10 +60,9 @@ func (wh *Warehouse) CreateFile(data io.Reader) (hash []byte, status int, err er
 	}
 
 	hash = hashWriter.Sum(nil)
-	hashA := hex.EncodeToString(hash)
 
 	// Check if the file exists
-	if _, _, valid := wh.FileExists(hashA); valid {
+	if _, _, status, _ := wh.FileExists(hash); status == StatusOK {
 		// file exists already, temp file not needed
 		os.Remove(tmpFileName)
 
@@ -72,7 +71,7 @@ func (wh *Warehouse) CreateFile(data io.Reader) (hash []byte, status int, err er
 	}
 
 	// Destination
-	pathFull, err := wh.createFilePath(hashA)
+	pathFull, err := wh.createFilePath(hash)
 	if err != nil {
 		os.Remove(tmpFileName)
 		return nil, StatusErrorCreatePath, err
@@ -117,20 +116,13 @@ func (wh *Warehouse) CreateFileFromPath(file string) (hash []byte, status int, e
 // ReadFile reads a file from the warehouse and outputs it to the writer
 // Offset is the position in the file to start reading. Limit (0 = not used) defines how many bytes to read starting at the offset.
 func (wh *Warehouse) ReadFile(hash []byte, offset, limit int64, writer io.Writer) (status int, err error) {
-	hashA, err := ValidateHash(hash)
-	if err != nil {
-		return StatusInvalidHash, err
+	path, _, status, err := wh.FileExists(hash)
+	if status != StatusOK { // file does not exist or invalid hash
+		return status, err
 	}
 
+	// read the file from disk
 	var reader io.ReadSeeker
-
-	path, _, valid := wh.FileExists(hashA)
-	if !valid {
-		// file does not exist
-		return StatusFileNotFound, os.ErrNotExist
-	}
-
-	// read from drive
 	retryCount := 0
 retryOpenFile:
 
@@ -174,14 +166,9 @@ retryOpenFile:
 
 // DeleteFile deletes a file from the warehouse
 func (wh *Warehouse) DeleteFile(hash []byte) (status int, err error) {
-	hashA, err := ValidateHash(hash)
-	if err != nil {
-		return StatusInvalidHash, err
-	}
-
-	path, _, valid := wh.FileExists(hashA)
-	if !valid {
-		return StatusFileNotFound, os.ErrNotExist
+	path, _, status, err := wh.FileExists(hash)
+	if status != StatusOK {
+		return status, err
 	}
 
 	if err := os.Remove(path); err != nil {
@@ -190,3 +177,30 @@ func (wh *Warehouse) DeleteFile(hash []byte) (status int, err error) {
 
 	return StatusOK, nil
 }
+
+// FileExists checks if the file exists
+func (wh *Warehouse) FileExists(hash []byte) (path string, fileInfo os.FileInfo, status int, err error) {
+	hashA, err := ValidateHash(hash)
+	if err != nil {
+		return "", nil, StatusInvalidHash, err
+	}
+
+	a, b := buildPath(wh.Directory, hashA)
+	path = filepath.Join(a, b)
+
+	if fileInfo, err := os.Stat(path); err == nil {
+		// file exists
+		return path, fileInfo, StatusOK, nil
+	}
+
+	return "", nil, StatusFileNotFound, os.ErrNotExist
+}
+
+// DeleteWarehouse deletes all files in the warehouse
+func (wh *Warehouse) DeleteWarehouse() (err error) {
+	return wh.IterateFiles(func(Hash []byte, Size int64) (Continue bool) {
+		wh.DeleteFile(Hash)
+
+		return true
+	})
+}
diff --git a/warehouse/Warehouse.go b/warehouse/Warehouse.go
index 5de5d5f..6020b5d 100644
--- a/warehouse/Warehouse.go
+++ b/warehouse/Warehouse.go
@@ -24,9 +24,6 @@ type Warehouse struct {
 	Temp      string // Temporary folder
 }
 
-// LogError is called for any error. The caller can use it to capture any errors.
-//var LogError func(function, format string, v ...interface{}) = func(function, format string, v ...interface{}) {}
-
 // Init initializes the warehouse
 func Init(Directory string) (wh *Warehouse, err error) {
 	// The temp folder will always be a sub-folder named "_Temp"
@@ -42,41 +39,6 @@ func Init(Directory string) (wh *Warehouse, err error) {
 	return
 }
 
-// TempFile creates a temporary file in the Warehouse. Do not forget to delete.
-func (wh *Warehouse) TempFile() (file *os.File, err error) {
-	file, err = ioutil.TempFile(wh.Temp, "wh")
-
-	return
-}
-
-// createFilePath creates the file path for the specified hash and returns the full file path
-func (wh *Warehouse) createFilePath(hash string) (pathFull string, err error) {
-	path, filename := buildPath(wh.Directory, hash)
-	return filepath.Join(path, filename), createDirectory(path)
-}
-
-// FileExists checks if the file exists
-func (wh *Warehouse) FileExists(hash string) (path string, fileInfo os.FileInfo, valid bool) {
-	a, b := buildPath(wh.Directory, hash)
-	path = filepath.Join(a, b)
-
-	if fileInfo, err := os.Stat(path); err == nil {
-		// file exists
-		return path, fileInfo, true
-	}
-
-	return "", nil, false
-}
-
-// DeleteWarehouse deletes all files in the warehouse
-func (wh *Warehouse) DeleteWarehouse() (err error) {
-	return wh.IterateFiles(func(Hash []byte, Size int64) (Continue bool) {
-		wh.DeleteFile(Hash)
-
-		return true
-	})
-}
-
 // ---- hash functions ----
 
 func ValidateHash(hash []byte) (hashA string, err error) {
@@ -106,6 +68,19 @@ func buildPath(storagePath, hash string) (directory string, filename string) {
 	return newPath, filename
 }
 
+// tempFile creates a temporary file in the Warehouse. Do not forget to delete.
+func (wh *Warehouse) tempFile() (file *os.File, err error) {
+	file, err = ioutil.TempFile(wh.Temp, "wh")
+
+	return
+}
+
+// createFilePath creates the file path for the specified hash and returns the full file path
+func (wh *Warehouse) createFilePath(hash []byte) (pathFull string, err error) {
+	path, filename := buildPath(wh.Directory, hex.EncodeToString(hash))
+	return filepath.Join(path, filename), createDirectory(path)
+}
+
 // IterateFiles iterates through all the files and calls the callback
 func (wh *Warehouse) IterateFiles(Callback func(Hash []byte, Size int64) (Continue bool)) (err error) {
 	// list all directories in the local Storage folder. We have to walk 2 levels down to see the actual files.
diff --git a/webapi/File.go b/webapi/File.go
index 3258b29..25527b2 100644
--- a/webapi/File.go
+++ b/webapi/File.go
@@ -145,10 +145,10 @@ func apiBlockchainFileAdd(w http.ResponseWriter, r *http.Request) {
 
 		// Verify that the file exists in the warehouse. Folders are exempt from this check as they are only virtual.
 		if !file.IsVirtualFolder() {
-			if hashA, err := warehouse.ValidateHash(file.Hash); err != nil {
+			if _, err := warehouse.ValidateHash(file.Hash); err != nil {
 				http.Error(w, "", http.StatusBadRequest)
 				return
-			} else if _, _, valid := core.UserWarehouse.FileExists(hashA); !valid {
+			} else if _, _, status, _ := core.UserWarehouse.FileExists(file.Hash); status != warehouse.StatusOK {
 				EncodeJSON(w, r, apiBlockchainBlockStatus{Status: blockchain.StatusNotInWarehouse})
 				return
 			}
@@ -233,10 +233,10 @@ func apiBlockchainFileUpdate(w http.ResponseWriter, r *http.Request) {
 	for _, file := range input.Files {
 		// Verify that the file exists in the warehouse. Folders are exempt from this check as they are only virtual.
 		if !file.IsVirtualFolder() {
-			if hashA, err := warehouse.ValidateHash(file.Hash); err != nil {
+			if _, err := warehouse.ValidateHash(file.Hash); err != nil {
 				http.Error(w, "", http.StatusBadRequest)
 				return
-			} else if _, _, valid := core.UserWarehouse.FileExists(hashA); !valid {
+			} else if _, _, status, _ := core.UserWarehouse.FileExists(file.Hash); status != warehouse.StatusOK {
 				EncodeJSON(w, r, apiBlockchainBlockStatus{Status: blockchain.StatusNotInWarehouse})
 				return
 			}