https://armantheparman.com/dicev1/
Here is a nice one. You should have an airgapped computer for the sha-256 checksum and verifying the entropy and xpub.
Do you trust an airgapped computers sha-256 ...
Ideally, whatever signing software/hardware you ultimately use with your seed would offer to add a checksum to entropy that you provide for you (some do; some don't).
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