diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 000000000..2b09bdb45
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,26 @@
+FROM ubuntu:14.04.3
+
+RUN dpkg --add-architecture i386 && \
+    apt-get update -y && \
+    apt-get install -y software-properties-common && \
+    add-apt-repository -y ppa:openjdk-r/ppa && \
+    apt-get update -y && \
+    apt-get install -y libc6:i386=2.19-0ubuntu6.7 libncurses5:i386=5.9+20140118-1ubuntu1 libstdc++6:i386=4.8.4-2ubuntu1~14.04.1 lib32z1=1:1.2.8.dfsg-1ubuntu1 wget openjdk-8-jdk=8u72-b15-1~trusty1 git unzip && \
+    rm -rf /var/lib/apt/lists/* && \
+    apt-get autoremove -y && \
+    apt-get clean
+
+ENV ANDROID_SDK_FILENAME android-sdk_r24.4.1-linux.tgz
+ENV ANDROID_SDK_URL https://dl.google.com/android/${ANDROID_SDK_FILENAME}
+ENV ANDROID_API_LEVELS android-22
+ENV ANDROID_BUILD_TOOLS_VERSION 22.0.1
+ENV ANDROID_HOME /usr/local/android-sdk-linux
+ENV PATH ${PATH}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools
+RUN cd /usr/local/ && \
+    wget -q ${ANDROID_SDK_URL} && \
+    tar -xzf ${ANDROID_SDK_FILENAME} && \
+    rm ${ANDROID_SDK_FILENAME} 
+RUN echo y | android update sdk --no-ui -a --filter ${ANDROID_API_LEVELS}
+RUN echo y | android update sdk --no-ui -a --filter extra-android-m2repository,extra-android-support,extra-google-google_play_services,extra-google-m2repository
+RUN echo y | android update sdk --no-ui -a --filter tools,platform-tools,build-tools-${ANDROID_BUILD_TOOLS_VERSION}
+RUN rm -rf ${ANDROID_HOME}/tools && unzip ${ANDROID_HOME}/temp/*.zip -d ${ANDROID_HOME}
diff --git a/apkdiff/apkdiff.py b/apkdiff/apkdiff.py
new file mode 100755
index 000000000..82d6b474c
--- /dev/null
+++ b/apkdiff/apkdiff.py
@@ -0,0 +1,78 @@
+#! /usr/bin/env python
+
+import sys
+from zipfile import ZipFile
+
+class ApkDiff:
+
+    IGNORE_FILES = ["META-INF/CERT.RSA", "META-INF/CERT.SF", "META-INF/MANIFEST.MF"]
+
+    def compare(self, sourceApk, destinationApk):
+        sourceZip      = ZipFile(sourceApk, 'r')
+        destinationZip = ZipFile(destinationApk, 'r')
+
+        if self.compareManifests(sourceZip, destinationZip) and self.compareEntries(sourceZip, destinationZip) == True:
+            print "APKs match!"
+        else:
+            print "APKs don't match!"
+
+    def compareManifests(self, sourceZip, destinationZip):
+        sourceEntrySortedList      = sorted(sourceZip.namelist())
+        destinationEntrySortedList = sorted(destinationZip.namelist())
+
+        for ignoreFile in self.IGNORE_FILES:
+            while ignoreFile in sourceEntrySortedList: sourceEntrySortedList.remove(ignoreFile)
+            while ignoreFile in destinationEntrySortedList: destinationEntrySortedList.remove(ignoreFile)
+                    
+        if len(sourceEntrySortedList) != len(destinationEntrySortedList):
+            print "Manifest lengths differ!"
+        
+        for (sourceEntryName, destinationEntryName) in zip(sourceEntrySortedList, destinationEntrySortedList):
+            if sourceEntryName != destinationEntryName:
+                print "Sorted manifests don't match, %s vs %s" % (sourceEntryName, destinationEntryName)   
+                return False
+
+        return True
+            
+    def compareEntries(self, sourceZip, destinationZip):
+        sourceInfoList      = filter(lambda sourceInfo: sourceInfo.filename not in self.IGNORE_FILES, sourceZip.infolist())
+        destinationInfoList = filter(lambda destinationInfo: destinationInfo.filename not in self.IGNORE_FILES, destinationZip.infolist())
+        
+        if len(sourceInfoList) != len(destinationInfoList):
+            print "APK info lists of different length!"
+            return False
+
+        for sourceEntryInfo in sourceInfoList:
+            for destinationEntryInfo in list(destinationInfoList):
+                if sourceEntryInfo.filename == destinationEntryInfo.filename:
+                    sourceEntry      = sourceZip.open(sourceEntryInfo, 'r')
+                    destinationEntry = destinationZip.open(destinationEntryInfo, 'r')
+
+                    if self.compareFiles(sourceEntry, destinationEntry) != True:
+                        print "APK entry %s does not match %s!" % (sourceEntryInfo.filename, destinationEntryInfo.filename)
+                        return False
+
+                    destinationInfoList.remove(destinationEntryInfo)
+                    break
+                
+        return True
+
+    def compareFiles(self, sourceFile, destinationFile):
+        sourceChunk      = sourceFile.read(1024)
+        destinationChunk = destinationFile.read(1024)
+
+        while sourceChunk != "" and destinationChunk != "":
+            if sourceChunk != destinationChunk:
+                return False
+
+            sourceChunk      = sourceFile.read(1024)
+            destinationChunk = destinationFile.read(1024)
+
+        return True
+
+if __name__ == '__main__':
+    if len(sys.argv) != 3:
+        print "Usage: apkdiff <pathToFirstApk> <pathToSecondApk>"
+        sys.exit(1)
+
+    ApkDiff().compare(sys.argv[1], sys.argv[2])
diff --git a/build.gradle b/build.gradle
index d7259f0f4..c251f6107 100644
--- a/build.gradle
+++ b/build.gradle
@@ -163,7 +163,7 @@ android {
         minSdkVersion 9
         targetSdkVersion 22
 
-        buildConfigField "long", "BUILD_TIMESTAMP", System.currentTimeMillis() + "L"
+        buildConfigField "long", "BUILD_TIMESTAMP", getLastCommitTimestamp() + "L"
         buildConfigField "String", "TEXTSECURE_URL", "\"https://textsecure-service.whispersystems.org\""
         buildConfigField "String", "USER_AGENT", "\"OWA\""
         buildConfigField "String", "REDPHONE_MASTER_URL", "\"https://redphone-master.whispersystems.org\""
@@ -249,6 +249,18 @@ tasks.whenTaskAdded { task ->
     }
 }
 
+def getLastCommitTimestamp() {
+    new ByteArrayOutputStream().withStream { os ->
+        def result = exec {
+            executable = 'git'
+            args = ['log', '-1', '--pretty=format:%ct']
+            standardOutput = os
+        }
+
+        return os.toString() + "000"
+    }
+}
+
 def Properties props = new Properties()
 def propFile = new File('signing.properties')