The answer
Some metal backups withstand severe heat and crushing, but survival is not guaranteed by the material alone. Letter depth, hinges, loose tiles, enclosure and fire duration all matter.
What to do next
Choose a design with documented independent testing and store backups in separate secure locations. Test legibility after assembly using dummy words, never your real seed on a public test bench.
Trezor hardware wallets
Hardware wallet or backup product relevant to a self-custody question. Availability, supported assets and local eligibility must be checked before signing up or buying.
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Frequently asked questions
Is metal backup safer than paper in every situation?
It can resist water and heat better, but theft, exposure during assembly and an unreadable engraving are separate risks.