Best cold wallets? Of course my first consideration was nostr:nprofile1qqsd0hut8c2pveuk4zkcws9sdap8465am9dh9cp8d2530yssuflcracpp4mhxue69uhkummn9ekx7mqprpmhxue69uhhyetvv9ujuumwdae8gtnnda3kjctvh2e48x bitkey, but open to recommendations.