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Latest release: 2.3.15 ( 4th October 2021 ) 🔍 Last analysed 10th November 2021 . Custodial: The provider holds the keys Not functioning anymore
4.2 ★★★★★
319 ratings
10 thousand
4th April 2019

As the provider of this product holds the keys, verifiability of the product is not relevant to the security of the funds!

As part of our Methodology, we ask:

Is the product self-custodial?

If the answer is "no", we mark it as "Custodial: The provider holds the keys".

A custodial service is a service where the funds are held by a third party like the provider. The custodial service can at any point steal all the funds of all the users at their discretion. Our investigations stop there.

Some services might claim their setup is super secure, that they don’t actually have access to the funds, or that the access is shared between multiple parties. For our evaluation of it being a wallet, these details are irrelevant. They might be a trustworthy Bitcoin bank and they might be a better fit for certain users than being your own bank but our investigation still stops there as we are only interested in wallets.

Products that claim to be non-custodial but feature custodial accounts without very clearly marking those as custodial are also considered “custodial” as a whole to avoid misguiding users that follow our assessment.

This verdict means that the provider might or might not publish source code and maybe it is even possible to reproduce the build from the source code but as it is custodial, the provider already has control over the funds, so it is not a wallet where you would be in exclusive control of your funds.

We have to acknowledge that a huge majority of Bitcoiners are currently using custodial Bitcoin banks. If you do, please:

  • Do your own research if the provider is trust-worthy!
  • Check if you know at least enough about them so you can sue them when you have to!
  • Check if the provider is under a jurisdiction that will allow them to release your funds when you need them?
  • Check if the provider is taking security measures proportional to the amount of funds secured? If they have a million users and don’t use cold storage, that hot wallet is a million times more valuable for hackers to attack. A million times more effort will be taken by hackers to infiltrate their security systems.
The product cannot be independently verified. If the provider puts your funds at risk on purpose or by accident, you will probably not know about the issue before people start losing money. If the provider is more criminally inclined he might have collected all the backups of all the wallets, ready to be emptied at the press of a button. The product might have a formidable track record but out of distress or change in management turns out to be evil from some point on, with nobody outside ever knowing before it is too late.

But we also ask:

Is the product still supported by the still existing provider?

If the answer is "no", we mark it as "Not functioning anymore".

Discontinued products or worse, products of providers that are not active anymore, are problematic, especially if they were not formerly reproducible and well audited to be self-custodial following open standards. If the provider hasn’t answered inquiries for a year but their server is still running or similar circumstances might get this verdict, too.

Help spread awareness for build reproducibility

Please help us spread the word discussing the risks of centralized custodians with BlockBank  via their Twitter!

Do your own research!

Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.

If you find something we should include, you can create an issue or edit this analysis yourself and create a merge request for your changes.

The Analysis 

Update 2021-11-03: This app is no more.

Google Play

Self described:

BlockBank is a non-custodial utility wallet that combines the power of decentralized and centralized technology.

Buy Crypto: A simple, secure and fast way to buy Bitcoin and crypto.

Keep your private key secure: with simple features like PIN lock, fingerprint recognition, wallet backup and email verification.

The app has many other features related to DeFi and staking.

The Site

Barely two minutes into Blockbank’s site, we were contacted by support through the embedded chat’s browser notification. We engaged with a conversation with them and they asserted that V2 will be non-custodial. We then asked for links to their source code if it was open source. They replied that they’d have to consult their developers for that. We were able to locate their github page, but it was not directly linked from their site.

Terms of Use

Many provisions in Blockbank’s Terms seem to point to a custodial service.

Termination related clauses, under Section 4:

We reserve the right to suspend, restrict or terminate your access to any or all of our Services and to deactivate your account, including without limitation


In the event that we decide to suspend, restrict or terminate your access to our Services in accordance with the provisions of this Clause 2, we will (to the extent that it is not unlawful for us to do so) provide you with adequate notice of such termination of Services. Suspensions from the use of our Services will be reversed only as soon as reasonably practicable once the reasons for refusal no longer exist. We are under no obligation to execute any suspended, reversed or terminated transactions at the same price or on the same terms.

We do not guarantee that any specific content, component and/or feature will always be available on the BlockBank.ai Wallet App Services.

Concerning the App’s Functions:

The BlockBank.ai Application gives you interactive access to your Digital multi protocol Asset Wallet, including allowing you to perform one or more of the following actions:
(a) view the balance and Transaction History of your Digital Asset Wallet;
(b) send and receive digital assets within the app.

View the market cap of the top 100 tokens;
(c) access news in one location;
(d) view the market cap of the top 100 tokens.

Concerning Open Source

We may make (but are not obligated to make) the source code for the software we develop available for download as open source software. You agree to be bound by, and comply with, any license agreement that applies to this open source software. You will not indicate that you are associated with us in connection with your use, modifications or distributions of this open source software.

Blockbank’s “Lightpaper”

Blockbank has a lightpaper which can be accessed here.

BlockBank consists of 4 main components:

  • a centralized custodial wallet,
  • a non-custodial web 3 wallet,
  • complete banking tech stack service,
  • banking and true AI (Robo Advisory).

The App

We tried the Blockbank app. Upon installation, we were greeted by this message:

Welcome to blockBank
BlockBank is a multi-protocol utility wallet that combines the power of decentralized and centralized technology in a simple and secure application.

BlockBank’s vision is to create an all-in-one crypto application that simplifies the user experience without compromising security, privacy, or decentralization. We aim to combine the best of Defi and DeFi worlds in one place, incorporating AI technology to bring financial empowerment to clients.

Blockbank has the user private keys encrypted with a pin code and secured through biometrics.


  1. Username
  2. Email (Needed in case user forgets pin)
  3. Pin
  4. First Name
  5. Last Name
  6. Phone (for sms verification)

The next step is to backup the wallet accessible via the pin. Encryption used is AES 256-bit. Password for backup file. The backup is stored in a txt file locally.

Tapping on ‘Settings’ opens a menu with the following sub-menus:

  • Backup
  • Restore
  • Private Keys

Selecting ‘Private Keys’ opens a menu with a gallery of 12 coins. Bitcoin is included. Selecting Bitcoin opens a prompt for the Pin. Inputting the Pin gives access to the private key. We tried importing the Blockbank private key to a third-party bitcoin wallet and we’ve managed to create a “watching-only wallet”


We reached out to Blockbank via their onpage chat support.


This was a difficult app to review and we would be open to correction and/or clarification, particularly if Blockbank would reply to our queries. On one hand, the app claims to be non-custodial, and provides the user with the private key, the ability to backup and restore the wallet. However, importing the private key to another wallet, we were only able to create a “watching only” wallet. Furthermore, the Blockbank wallet app backup can only be used with another Blockbank wallet app. Now this becomes problematic especially since it is stated in the terms of use that:

We do not guarantee that any specific content, component and/or feature will always be available on the BlockBank.ai Wallet App Services

This clause falls under termination. You may have the backup or the private key, but if you don’t have access to the app - because let’s say, your account was suspended, then this is a custodial service and therefore not verifiable

Note: With that said, we are willing to change our verdict upon further guidance by the Blockbank team.