http://uwb25d43nnzerbozmtviwn7unn7ku226tpsjyhy5n4st5cf3d4mtflqd.onion/posts/tamper/index.html
Alternatively, if you have an Android smartphone (either GrapheneOS or a cheap one for intrusion detection ), you can use an app called Blink Comparison , which makes it less likely that you will miss something. It can be installed like any other app that doesn't require Google Services , i.e. not through F-Droid. The Blink Comparison app encrypts its storage to prevent an adversary from easily replacing the photos, and provides a helpful interface for comparing them.