What is the image encoding method?

I would like to download the database and print the pictures in it. However, the image JSON encoding mode is unknown. How to solve it please？
I/WM-WorkerWrapper: Worker result SUCCESS for Work [ id=63175d63-456b-4b8e-8605-d16370611b88, tags={ AttachmentUploader, co.tinode.tindroid.AttachmentHandler } ]
D/Tinode: out: {"pub":{"content":{"ent":[{"data":{"val":"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
D/Tinode: in: {"ctrl":{"id":"114054","topic":"usr9I7MaS84QPE","params":{"seq":14},"code":202,"text":"accepted","ts":"2021-05-10T07:24:42.055Z"}}
tinode / tindroid

What is the image encoding method? #159
