Where do you keep your coins ?
Do you have 70 wallets?
If not, you do not really own the coins; it´s all about the private key.
yeahh, most of them in the exchanges.. i have been thinking about a trezor, nano S... but it seems that they only support a few coins.. at least i have seen there is new firmware that makes trezor compatible with all ERC-20 tokens.. so maybe i buy one to give it a try.
btw, where do you store them?¿