Get a cheap pc/laptop that never see the internet. Install a wallet via usb
But if you choose only that way then it can be unsafe.
Because if this pc stops working and you don't have any other backup then you already have lost the bitcoins.
At least 2-3 backups you should have, 1 usb, 1 paper wallet, 1 pc/laptop etc..
also the fact that everytime you need to spend your coins you would need to start up your laptop, meaning if you go outside and find a merchant that accepts bitcoin you wouldnt be able to pay them because your laptop would be at time.
the same logic applies for paper and usb wallets
, i like bitcoin but i dont like the fact that it needs to be locked away to be safe,
You won't walk on the streets with all of your bitcoins in your wallet I guess.
This is the reason why bigger mobile wallet providers offer a so called cold storage (XAPO wault, etc) next to your everyday spending wallet.
It's like you only take a little amount of cash in your leather wallet in your pocket, the rest of your money is in the bank, in the safe at home or in your pillow
In this case you can manage your everyday spending of your bitcoins from your mobile wallet with a lower balance and the rest of your BTC can be safe in cold storage or in phisical storage like Trezor.
But most secure in the sense not vulnerable from cyber attack or system crash.
To solve system crash, we must need multiple back ups.
To prevent attack or hacking, we must go with strong encryption with long multi-character set password.
If you want the most secure wallet, what you want is to have it on a offline computer. Does not get any better. And the wallet best suited to make signing transaction with a offline computer the easiest is Armory.
You just insert usb key, and let it guide you through the process of importing and signing the transaction with the offline computer.
It never connect online, so its the safest.
If you want to do cold storage using two computers at the moment Electrum is your better choice. It functions just like Armory with online/offline wallets. Armory 0.93.2 will
not work with the latest Bitcoin Core 0.11.1. Armory signs HighS while 0.11.1 mandates LowS.
I have used both Electrum and Armory for cold storage using two computers and have to tell you that Trezor is easier and cheaper. It works fine with latest Electrum 2.5.1. When working, Armory as a fully validating node does have a privacy advantage over Electrum because the Electrum server you use knows which addresses you are using. But Armory is no more secure than Trezor.
If Armory (or Bitcoin Core) ever supports Trezor that would be the ideal combination for privacy plus security. Until then I am fine using Trezor with Electrum 2.5.1. Heck, if you cannot afford $99 for a Trezor the Ledger Nano with Starter USB is only $40. Both are proven and work with your phone.
