This are real receipts I collected recently from various places of K(ie|yi)v and Odess?a cities: McDonalds, grocery shops, bus companies, other small businesses.
There is a common feature on all these receipts that should catch reverse engineer's attention, while it's almost invisible to laymen. (And this is not QR code.)
What is this? What can you say about it? What caught my attention in these ordinary pieces of (thermal) paper? Why I decided to make a RevEng challenge out of it?
What maximum information can you extract of it? Even newbies should try this challenge.
All receipts in Ukrainian, but no Ukrainian language knowledge is required. Also, any knowledge about Ukraine as country is not needed as well.
More receipts like these. I put many of them (>10) for reason.
As usual, if you want to check your ideas, you can just ask me by email: dennis at yurichev dot com. You can use temporary/anonymous/throwaway/sock puppet email(s): I don't care. You can ask for hints.
Also, discord users will get access to a highly elitist private discord channel (irony here) '1-challenge-solved'.
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Some time ago (before 24-Mar-2025) there was Disqus JS script for comments. I dropped it --- it was so motley, distracting, animated, with too much ads. I never liked it. Also, comments didn't appeared correctly (Disqus was buggy). Also, my blog is too chamberlike --- not many people write comments here. So I decided to switch to the model I once had at least in 2020 --- send me your comments by email to blog at yurichev dot com (don't forget to include URL to this blog post) and I'll copy&paste it here manually.
Let's party like it's ~1993-1996, in this ultimate, radical and uncompromisingly primitive pre-web1.0-style blog and website.