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https://www.youtube.com/watch?v=DJLR1DswfhA
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Here's some more reading from a Dutch site
https://www.martinvrijland.nl/en/news-analyses/breaking-digitale-qr-code-rantsoenering-aanstaande-eerst-gas-dan-brandstof-en-voedsel/
^^ and read harry_1234's comment under it
already exist