http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/hardware-recovery-seed
Bitcoin engineer Jameson Lopp has looked into what material may withstand natural disasters, but showed the search wasn’t easy. CRYPTOTAG , a cryptocurrency security firm, believes to have found the answer: space graded titanium wallets, which can withstand almost anything. However you decide to store your cryptocurrencies remember that if you don’t control the keys, you don’t control the funds.