"Titanium Engraver"

Paper can burn, ink can fade. Therefore, this character doesn't trust paper to store their Seed Phrase. They buy expensive titanium plates and a set of steel stamps. They spend the weekend hammering away, engraving their 24-word password onto metal that is claimed to be fireproof, rustproof, and nuclear explosion-proof. Their house may be destroyed by disaster, but they are confident that the iron plate under the rubble will still safely store their wealth.