# <center><i class="fa fa-edit"></i> 4.2 Hot and Cold Storage</center>
###### tags: `Blockchain`
The following notes are taken from [Coursera](https://www.coursera.org/learn/cryptocurrency/home/week/2)

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Hot Storage:
- Online
- Convenient
- Risky
- Hot secret keys and cold addresses

Cold Storage:
- Offline
- Archive
- Safer
- Cold secret keys and hot addresses

Payments go grom hot to cold storage; separate keys

:::danger
**Problem:**
How can hot wallet learn new addresses if cold wallet is offline
:::

:::success
**Solution:**
In contrast to Regular Key Generation:

Hiearchial Wallet:
:::

### How to Store Cold Info
1. Info store in device, decide locked in safe
2. "Brain Wallet": encrypt info under passphrase that user remembers
3. Paper Wallet: print info on paper, lock paper
4. In "tamperproof" device: device signs but won't reveal

Security of keys are as good as these devices