When a webpage changes, disappears, or gets disputed, screenshots alone can be hard to trust. A receipt bundle is a small folder of artifacts you can generate yourself (captured HTML/PDF, hashes, timestamps, and reproducible notes) so someone else can verify what you saw.
Typically: the fetched page body (or a PDF), a SHA-256 hash of each file, the exact URL, the timestamp, and a short “how to reproduce” note. The key property is that another person can rerun the same steps and compare hashes.
Is this the same as the Wayback Machine?
No. The Wayback Machine is a great public archive, but a receipt bundle is something you can generate immediately and share directly (for example, in a bug report) with hashes that are trivial to verify.
Do I need special tools?
No. You can build a basic bundle with a browser and a hashing tool. The video demonstrates one workflow; the important part is being explicit about inputs (URL), outputs (files), and verification (hashes).