One of the safest way to store your bitcoin is using @Blockstream cold wallet nostr:nevent1qqstcxnkqrmv4zetmfjj4vadc3h737p6jmwqyna2gjmc9f6r8w4u5qsprpmhxue69uhhyetvv9ujuumwdae8gtnnda3kjctvqgsfy229w70e8lgtxavlz9t78k06yrel6fxyhreteafqet8kfxhhwmgrqsqqqqqpl73gp8