Unity Cloud Build webhook artifact md5sum incorrect

Hello,
I'm downloading a build via the json that comes through via webhook. Webhook json reports a "md5sum" of

xUEMssO+Xkmv6yw78U/y9Q==

whereas PHP and other md5 generators report the checksum as

c5410cb2c3be5e49afeb2c3bf14ff2f5

. The file size is correct and the file itself is OK. What is the "md5sum" property in the json's articfacts/files/md5sum actually for? Because it's not the file...

Here's the json:

Code (csharp):

1. {
2.   "buildNumber": 5,
3.   "buildStatus": "success",
4.   "buildTargetName": "Default Android GearVR",
5.   "cleanBuild": false,
6.   "lastBuiltRevision": "3dd49b6761361fac40a241b210721e3730ba801a",
7.   "links": {
8.     "api_self": {
9.       "href": "/api/orgs/virtual-reality-rehab-inc/projects/unitycloudbuildtesting/buildtargets/default-android-gearvr/builds/5",
10.       "method": "get"
11.     },
12.     "api_share": {
13.       "href": "/api/shares/Zy-DXkw3zE",
14.       "method": "get"
15.     },
16.     "artifacts": [
17.       {
18.         "files": [
19.           {
20.             "filename": "Default Android GearVR.apk",
21.             "href": "https://storage.googleapis.com/unitycloud-build-user-svc-live-build/2473928866007%2Ff27be5f6-db91-424e-9838-81d096bc6912%2Fdefault-android-gearvr-5%2FDefault%20Android%20GearVR.apk?GoogleAccessId=signurl-sa%40unity-cs-cloudbuild-prd.iam.gserviceaccount.com&Expires=1543934186&Signature=C2SVB63oSmjwCRWziIUS3RMbO1cOX1mU7RHTXCXr4L3IRy9Um1aajYSQcXjB2UFwP65o3LX0uNJOu1p5%2FWoUVoNVcFBAmQPoIxO9%2B1APBdXhSi2uibfOUodd2nIdINKfG0Z6neYvWKXl%2Fyp%2B%2BzkbesA3KJI%2B%2BIuL8lQiySSBncenaICfIXCqtSN4KED874%2FlDf8BbHkZMmOClRdBkazyGtUbHk%2FmMUOnKU36fHYfTFqxd50gzOZiIM%2BzcEWFYVP0CzyLaqPUB097zFyDSKdoXg1qM71WGnljyXm3%2BkuyA3aMw6aJCLHDXjcUW%2BeepKbOiYKOxAWsQQPOOT47hMaT4g%3D%3D&response-content-type=application%2Foctet-stream&response-content-disposition=attachment%3B%20filename%3Dvirtual-reality-rehab-inc-unitycloudbuildtesting-default-android-gearvr-5.apk",
22.             "md5sum": "xUEMssO+Xkmv6yw78U/y9Q==",
23.             "resumable": false,
24.             "size": 12612804
25.           }
26.         ],
27.         "key": "primary",
28.         "name": ".APK file",
29.         "primary": true,
30.         "show_download": true
31.       }
32.     ],
33.     "dashboard_download": {
34.       "href": "https://developer.cloud.unity3d.com/build/orgs/virtual-reality-rehab-inc/projects/unitycloudbuildtesting/buildtargets/default-android-gearvr/builds/5/download/",
35.       "method": "get"
36.     },
37.     "dashboard_download_direct": {
38.       "href": "https://developer.cloud.unity3d.com/build/orgs/virtual-reality-rehab-inc/projects/unitycloudbuildtesting/buildtargets/default-android-gearvr/builds/5/download/direct/",
39.       "method": "get"
40.     },
41.     "dashboard_log": {
42.       "href": "/build/orgs/virtual-reality-rehab-inc/projects/unitycloudbuildtesting/buildtargets/default-android-gearvr/builds/5/log",
43.       "method": "get"
44.     },
45.     "dashboard_project": {
46.       "href": "/build/orgs/virtual-reality-rehab-inc/projects/unitycloudbuildtesting",
47.       "method": "get"
48.     },
49.     "dashboard_summary": {
50.       "href": "/build/orgs/virtual-reality-rehab-inc/projects/unitycloudbuildtesting/buildtargets/default-android-gearvr/builds/5/summary",
51.       "method": "get"
52.     },
53.     "dashboard_url": {
54.       "href": "https://developer.cloud.unity3d.com",
55.       "method": "get"
56.     },
57.     "share_url": {
58.       "href": "https://developer.cloud.unity3d.com/share/Zy-DXkw3zE/",
59.       "method": "get"
60.     }
61.   },
62.   "local": false,
63.   "orgForeignKey": "redacted",
64.   "platform": "android",
65.   "platformName": "Android",
66.   "projectGuid": "redacted",
67.   "projectName": "UnityCloudBuildTesting",
68.   "scmType": "git",
69.   "startedBy": "redacted"
70. }

The APK build is available here:
https://www.naplandgames.com/vrrbuildtest/UnityCloudBuildTesting/Default_Android_GearVR_20181204_failed.apk

Thanks!

 

Nevermind. I love how twice in 2 days I've answered my own question as soon as I post
For anyone else stumped: The "md5sum" is base64... All is well.