Oreolek 👾archivebox is a very useful tool to keep receipts
you give it a URL and it makes a snapshot: two HTMLs, WARC file, PDF, full page screenshot, then sends it to archive.org to be 100% sure. It's too easy to fake a screenshot, but this is a compelling pile of evidence.
it's not for a regular user, though: piping URLs to console commands isn't a common knowledge. But I hope someone will make a service or something.
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