# Cold Wallet Survey

[TOC]

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### OKEx security design protocol

- [link](https://www.okex.com/wallet-security)

### Ledger vault : properly secure cryptocurrencies exchanges
- [link](https://www.ledger.com/how-to-properly-secure-cryptocurrencies-exchanges/)( HSM based security architecture for exchanges )

### Coinpayments

- [What is the Vault](https://www.coinpayments.net/index.php?cmd=acct_balances&action=lock&coin=USDT.ERC20)
- `Lock for this many hours: 24 (Maximum: 56 hours)`

### Coinbase
- vault management :
1. Individual v.s Group (email verify)
- withdrwal :
1. Delay time : 48 hours
2. Unapproved vault withdrawals will be canceled in 24 hours
- [FAQ](https://help.coinbase.com/en/coinbase/getting-started/other/vaults-faq.html)

### Robinhood
- valut management :
1. Automatically stored in a mix of cold (offline) storage and hot (online) storage
2. Not mention proportion

### Bitfinex
- valut management :
- HSM
- Cold wallet v.s Hot wallet = 99.5 : 0.5
- [link](https://support.bitfinex.com/hc/en-us/articles/213892469-Bitfinex-Security-Features)

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## Details

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### Coinbase

> How do I withdraw funds from a vault?
To withdraw, just click on the vault in the Portfolio page and click the "withdraw" button in the top right.

> For a standard vault, once you enter the withdrawal details, a confirmation email will be sent to your inbox and to your secondary email inbox. **Once the details are approved there, the 48- hour waiting period will begin.**
>
> Note: Currently, it's only possible to create one withdrawal request at a time. You must wait for an existing withdrawal to complete, or cancel it, before making another.




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### Coinpayments



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## Reference

* https://github.com/magoo/Blockchain-Graveyard/tree/gh-pages