I think Keystone's products look very attractive, but the numbers of reviews and Google Play downloads are too small.
Bitbox02 is good too, but it also faces the problem of too few users.
I wish these two products can receive more attentions and have more users.

According to the number of app downloads on Google Play Store, the data published by the official websites of various wallets, and the number of reviews on Amazon, I estimate that only Ledger, Trezor, and Safepal have 1 million users. Among them, only Trezor is open source. This indicates that users lack the necessary knowledge, or are ignorant.
The number of users of other brands is particularly small. I estimate that the number of OneKey users is less than 300,000, the BitBox users is less than 100,000, and the Keystone users is less than 30,000. If a company's annual sales is less than 100,000, is its profit enough to maintain the operation? With too few users, the supervision will be insufficient, and it will not be safe.

谢谢赐教！如果我只有50万人民币要出金，去一趟香港成本显得太高了些。
币安币商赚差价，通常只有0.1-0.5%的利润，这可以推测出：币商银行卡被冻结（公安冻结那种）的概率小于0.1%吗？如果大于这个概率，币商岂不是要亏本？

当然，如果有大钱（几百万），去香港办银行卡就有必要了。

现在有什么办法通过合规平台转入香港银行卡吗？

您好，请教：
     1. 如果不贪便宜，选择币安C2C交易量大，注册时间长的币商出金，被冻结的概率能小于1%吗？
     2. 这个策略合适吗？我使用8-10张银行卡（非工资卡）小额出金，出金后放在银行卡10-15天，如果没事，取现金，然后集中存到我老婆的银行卡。
     3. 向币安的币商买U，是不是完全没被冻结的风险？这种情况人民币是流出的。
     4. 一般情况下，银行卡被公安冻结后，钱还能要回来的概率有多大？
     5. 还有什么更好的出金门道吗？

请高人指点！

您好，请教：
     1. 如果不贪便宜，选择币安C2C交易量大，注册时间长的币商出金，被冻结的概率能小于1%吗？
     2. 这个策略合适吗？我使用8-10张银行卡（非工资卡）小额出金，出金后放在银行卡10-15天，如果没事，取现金，然后存到我老婆的银行卡。

I noticed that the trading amount of DAI on Binance and OKex is very very small. Will there be a problem of low liquidity if I hold DAI?

That's true for any hardware wallet. So, think twice before you do something you might later regret. If in doubt, ask questions before, not before making a mistake.
[/quote]

Thank your suggestions.
I placed an order for OneKey, now own three different brands of hardware wallets: Trezor One, Bitbox02, and OneKey Classic. I will take care of the OneKey's open source nature and reputation, and will immediately disable it if anything bad happens.

Compared to OneKey, DKBit98 may prefer Keystone, perhaps because Keystone is air-gapped.
However, in terms of user base, OneKey (with 50k downloads on Google Play) is significantly larger than Keystone (with 5k downloads).

Storing BTC can using multi-signature wallets, which provide a highest secure guarantee. However, for storing altcoins, only single-signature wallets are available. Currently, there are a few well-known open-source wallets for altcoins, including Trezor, BitBox, OneKey, Keystone, and KeepKey.

Originally, I only intended to use Trezor as it has the most user and the most open-source nature. I came across various user reviews of hardware wallets on the website https://www.trustpilot.com/review/  and found that Trezor had the most stolen customers (= 12). Although it is widely believed that user responsibility led to these thefts, but a single mistake could wipe me out. So I chose diversifying my altcoins in 3 hardware wallets.

I want to buy three different brands of hardware wallets to diversify my altcoin storage. Currently I have TREZOR ONE and BITBOX02, both were purchased directly from the official website. It's hard to choose the third option, as both onekey and keystone not passed the  of open source testing of WalletScrutiny. Is there any problem with the open source nature of OneKey at present? Can I trust that it is completely open source?

Using a passphrase, I am not very worried about being stolen after physical acquisition. Two worried things: 1. It cannot be hacked remotely. 2. It must be sufficiently open source to allow the community to fully review it.

谢谢大牛解答！

研究了好久了，没得什么特别好的办法。打算还是存在硬件钱包里，尽量不取出来。
开源硬件钱包学习了也有好久了，目前买了trezor one 和bitbox02，在等待和考虑要不要买keystone，目前无法确认它是否足够开源。

顺便提醒一下国内的朋友，闭源钱包不要再买了，比如ledger, safepal, imkey(imtoken)。这些我都买过，当垃圾丢了。
因为它的代码是不公开的，理论上如果在代码上留后门，分分钟偷你没商量。
目前支持山寨币的，最开源的就是trezor one 和bitbox02，国内有keystone和onekey, 但后2种安全性比不上前2个。

I want to have 3 different brands of open source hardware wallets to store altcoins and spread risk.
I currently use the Trezor One and just placed an order for the BitBox02. And need a third one of different brand.
I have noticed that Keystone 3 pro uses an embedded system, not the previous Android OS.
I am not sure that whether Keystone 3 will be open source like Trezor Safe 3 or Bitbox02?
Or just wait a few months?

I have carefully reviewed the stolen comments and have difficulty confirming the true reason for the theft. I am not a professional, but I believe that there is no problem with the firmware of the Trezor and the Trezor Suite, only the hardware may have problems. If a backdoor is left on a small amount of hardware, ordinary users and professionals cannot detect it. Of course, if the Trezor firmware can effectively eliminate the harm of fake hardware wallets, it can only be stolen due to user errors.

It is a fact that there are many cheaters in China, so I don't want to buy Keystone and Onekey, even though it is free shipping (I am Chinese). But don't underestimate the Europeans, too.

The high probability is that the user's own problem caused the theft. Having professionals to answer questions can make newbies feel ease.  o_ e_ l_ e_ said:"Just one incident can wipe me out."  It's better to be cautious.

You may be right. I found user reviews of different wallets on the bitbox website. see https://bitbox.swiss/bitbox02/#compare and https://www.trustpilot.com/review/bitbox.swiss
I compared several kinds of wallets and recorded the theft situation myself, as follows:

Trezor,     User score: 3.5,  Number of reviews: 405,   Number of stolen users: 12, Some details: Robert in AU, 160,000$ stolen; Curtis in US, 100,000$ stolen; Donald in US, 60,000$ stolen; Voodoo in AU, 0.4BTC stolen.
Ledger,    User score: 2.8,  Number of reviews: 1559, Number of stolen users: 12, Some details: Di in IT, 1 eth stolen; Ale in AU, 0.33BTC stolen.
Keepkey,  User score: 2.4,  Number of reviews: 290, Number of stolen users: 1, Some details: Gennady, 5000$ stolen.
BitBox,     User score: 4.9,  Number of reviews: 547, Number of stolen users: None
Keystone, User score: 4.2,  Number of reviews: 47,   Number of stolen users: None
Onekey,   User score: 3.5,  Number of reviews: 56,   Number of stolen users: None

Thank you very much, o_ e_ l_ e_ o！ Thank you for your advice.
I seen that video, and known that the fingerprint U disks were not unbreakable.
So the handwritten documents corresponding to the unencrypted files on the USB drive, will not be stored at my home (off site backup).

I divided the seed phrase and passphrase into two parts, one handwritten and the other stored on USB drives. If the files in the fingerprint U disks are not encrypted, then I do not need to remember any passwords to recover the wallet data. If I have three fingerprint-encrypted USB drives, and check whether they work properly every year. Then the probability will be very very low that they will all be unusable at the same time? Your method: seed phrase and passphrase were backed up on physical non-digital media. Please tell me, what is the difference between yours and mine?

Some wallet data are handwritten on papers and stored with multiple copies (5-6 copies); remainder wallet data is stored with electronic format, which are stored on 3-4 encrypted USB drives and 2-3 emails. There are unencrypted files in the two fingerprint U disks, but the corresponding handwritten files are not stored in my home. The encryption file production is completed on offline isolated computers.

The most terrible thing is that the U disk is broken. I currently have 3 encrypted USB drives and plan to buy one more. In addition, I have added another preventive measure. Finally, email encryption is the last way to open files.