I didn't think it was wif format because he mentioned A-F Letters only and isn't wallet import format base58?
If its hexadecimal then standard would be 64 characters
Right, but good tips
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Not exactly 64, no.
The key itself is 64 but there is a prepended version byte and 4 extra bytes of checksum at the end. This adds 5 x 2 = 10 hex chars. I'm not sure how you get to 80 but I'm trying to figure it out :)
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