Bitcoin’s streak of breaking its own record price has been relentless for the past few months, with the cryptocurrency climbing over $15,000 this week, from having been less than $800 this time last year. This unprecedented growth – nearly 10 times its value since the start of 2017 – has brought Bitcoin squarely into mainstream attention.

Though the debates over the currency being in a bubble continue to have voices from all directions, what’s clear is that those with a big stake with Bitcoin need to be safer than ever with their digital investment. After all, it’s real money that’s at stake. Bitcoin wallets have faced multiple hacks in the past, so it’s worth going the extra step to secure your funds.

The most convenient way to store Bitcoins is by using an online wallet, which allows you to quickly transfer money in and out of the wallet, or turn Bitcoins into alternative cryptocurrencies such as Ethereum, Monero, Litecoin, and others. But the safest option is known as ‘cold storage’, which stores your Bitcoins offline away from any Internet access. This is all the more important if you’ve got large amounts of Bitcoin.

Here’s how to set up cold storage for your Bitcoin wallet:

1. Paper Wallet
The easiest way to take your Bitcoins offline is by using paper and a printer. Yes, really. You’ll also need a website that allows you to create an offline Bitcoin address, such as Bitcoin.com or Bitaddress.org. Follow these steps to create a Bitcoin paper wallet:

Head to the Bitcoin.com paper wallet or the Bitaddress.org page.
Save the page locally to your computer as an HTML file.
Next, close the page and disconnect your computer from the Internet.
Open up the saved local version of Bitcoin.com paper wallet or Bitaddress.org.
Follow the instructions on the page to create a new Bitcoin address.
Once you’ve a pair of keys and QR codes, print the page. Make sure your printer is not connected to the Internet for added security.
You can now use the new public address/ QR code to transfer Bitcoins from another online wallet.

The printed page is the most valuable piece of document for your Bitcoin investment. You should ideally store the printed page in a water and fire-proof container, such as a safe. If that’s not an option, create multiple versions of it and give it for safekeeping with trusted family, in the case of damage to your version. You could also laminate the page for protection.
2. BitKey
While taking your computer and printer offline is a good security measure, it’s not as safe as using a clean operating system. BitKey is basically a free bootable Linux distro that you can write to a USB drive or CD-ROM. Plus, it can run live from computer’s memory (RAM) so you can eject the drive/ disc once it’s running.

BitKey comes pre-installed with multiple software options: Electrum Bitcoin client, WarpWallet (more on that later), and Bitcoin paper wallet among others. It also has built-in network, printer, and wireless managers so you can use it for all necessary Bitcoin purposes. Creating a paper wallet with BitKey is safer than using your existing OS.

Here’s how to create a bootable USB/CD with BitKey:
Head to the BitKey website to download the OS image.
Click the Download button, and get the 64-bit version.
Choose between USB and CD-ROM. The latter is safer since they are read-only by default. For USB sticks without write protection, it’s advisable to remove them after boot.
Burn a CD with your favourite program, or use a utility such as UNetbootin to write the BitKey ISO to a USB drive.
Boot into BitKey by using your computer’s advanced boot function (varies from F8-F12 depending on motherboard manufacturers).

If the boot is successful, you can use BitKey to create a paper wallet, and you can even use the Electrum client to create an offline wallet. BitKey provides three operation modes – cold-offline, cold-online, and hot-online – which define whether the computer is offline and air-gapped.

It also decides how convenient the process will be. Choose cold-offline in BitKey for maximum security and least convenience, and hot-online for lesser security and more convenience. You can only prepare transactions in cold-online, though. Follow the three links to figure out which method works for you best.
Read more: https://techtip.com.ng/store-bitcoin-offline-cold-storage/

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Different strokes for different folks. Cold storage mechanisms actually differ depending on the manufacturer.

However, one thing is common among all, which is the fact that they all store your coin offline without the internet. Essentially, they are highly secure hardware devices.

This article explains in-depth - https://blog.bitmama.io/what-is-a-cold-storage-wallet/