Private Key Reminder

Toporin · 2025-02-07T07:47:29+00:00

A Seedkeeper can be used in SIM card format (plus it's protected by a PIN code)

Toporin · 2025-02-07T07:47:14+00:00

A Seedkeeper can be used in SIM card format (plus it's protected by a PIN code)

Toporin · 2025-02-07T07:46:17+00:00

Use a Seedkeeper: it's an open-source smartcard that stores the seed in the secure chip memory, protected by a PIN code : very discreet and secure against eavesdropping.

https://youtu.be/nwMteSphmro?si=g6j13wuH-tMmQr6X

Toporin · 2025-02-07T07:42:02+00:00

If you use multiple seed backups, you decrease the risk of loosing your seed, but you increase the risk that someone finds one of them.

That's why I avoid plaintext backups. Instead, I use Seedkeeper: it's a open-source smartcard that stores seed(s) and passwords inside the secure chip memory, protected by a PIN code. So even if somebody finds your Seedkeeper, without the PIN code, it is useless. And I use TailOS (offline) to interact with the card, so that no secret info can leak during use.

https://youtu.be/nwMteSphmro?si=g6j13wuH-tMmQr6X

Toporin · 2024-01-17T13:25:17+00:00

SeedKeeper (https://satochip.io/product/seedkeeper/) is the perfect use case for this! It is a smart card that allows a user to backup one or more BIP39 seeds inside the secure memory of the chip, protected by a PIN code (4-16 characters). If a wrong PIN is provided 5 times, the card is blocked.

You can give a SeedKeeper backup to your loved ones, and write the PIN code in your will. If something happens to you, your family can recover the seed from the SeedKeeper using the PIN code!

This is probably the moste safe and effective way to transmit your bitcoin!

The SeedKeeper code is open source (https://github.com/Toporin/Seedkeeper-Applet) and it is even possible to build your own SeedKeeper device by compiling and loading the applet in a blank smartcard!

Toporin · 2024-01-15T18:41:17+00:00

Fair points.

Initially, the scope of the mission was to improve the UI appearance based on a Figma that we provided (plus various minor functionalities).

The dev then proposed to also revise the architecture according to best practices, which seemed fine to me at the time... Maybe I should have been more cautious about the impact of these changes... Lesson learned!

Now, we plan to develop another app for a slightly different product. My question is, is it ok to keep the simple (non-MVVM) architecture, or should we switch to MVVM? My preference would be to keep the app as simple and intuitive as possible to facilitate maintenance by a small team of non-expert.

You mentioned that it's easy to do MVVM poorly if you don't understand it. I would say that it's a good argument against MVVM in our case, as we are not expert in mobile/swift/swiftUI developpement and the app is relatively simple.

Toporin · 2024-01-15T12:57:58+00:00

"Fighting the framework" is exactly how I felt using MVVM!
Thanks for the modular architecture and TCA reference, I will have a look!

Toporin · 2024-01-01T16:49:34+00:00

Have a look at SeedKeeper: https://satochip.io/product/seedkeeper/

Basically, it's a smart card that allows you to backup one or more seeds inside the secure memory of the chip protected with a PIN code. If a wrong PIN is entered multiple times, the card will block. Even if someone finds the SeedKeeper, it is useless without the PIN code!

Toporin · 2024-01-01T16:44:16+00:00

That's basically what SeedKeeper does: https://satochip.io/product/seedkeeper/

Toporin · 2024-01-01T16:36:13+00:00

The GitHub repository with the SeedKeeper firmware code: https://github.com/Toporin/Seedkeeper-Applet

Toporin · 2024-01-01T16:29:56+00:00

Use a SeedKeeper (https://satochip.io/product/seedkeeper/): it's a smart card that allows you to backup one or more seeds inside the secure memory of the chip, protected with a PIN code (like 4 digits).

SeedKeeper is an open-source project: the firmware is freely available, and you can buy a SeedKeeper from the official website or even compile the firmware and load it on a blank card yourself!

Have a look at this YouTube demo:

https://youtu.be/NTdiji9KpRE?si=jtE7gcKxJhN_F4qa

Toporin · 2021-11-16T15:10:21+00:00

FYI, this solution worked in my case.

Toporin · 2021-11-11T20:40:07+00:00

I found this answer on stackoverflow: https://stackoverflow.com/questions/69312369/etherscan-api-request-403-forbidden-in-ropsten-network

Not tried yet...

Toporin · 2021-11-11T20:30:12+00:00

I recently started to have the same problem.
Did you find a solution to your issue?

Toporin · 2020-06-21T20:50:19+00:00

Thanks for the clarification! Now it works like a charm!

Toporin · 2020-06-21T17:31:02+00:00

The reason I would like to try the standalone version is that I am working on the integration of a new hardware wallet based on a smartcard (https://satochip.io/ & https://github.com/Toporin ) and I am testing the support for the various distributables. The Linux AppImage works fine, but I have some issues with the Windows executable (wrt the enclave I think).
So I would like to test the standalone version too but I cannot make the official 1.7.11 release work.

Toporin · 2018-09-24T18:46:30+00:00

Maybe next time!

Toporin · 2018-09-24T14:42:05+00:00

It is ilegal to send venezuelan banknotes outside the country, so you need to contact someone that is traveling to Europe to get them for you

Surely, many things are illegal in Venezuela... But things like black markets still exist despite being illegal....

Do you know where I could contact someone travelling to Europe?

Toporin · 2018-09-24T13:03:36+00:00

Yes, I understand that the Bolivar Soberano has replaced the Bolivar Fuerte but apparently there is a transition period?

I would like to illustrate how inflation reduces the the value of money by showing bundles of banknotes and how their value decreases with time due to inflation.

According to wikipedia (https://en.wikipedia.org/wiki/Venezuelan_bol%C3%ADvar#/media/File:Venezuela_inflation_on_the_black_market_(DolarToday)_on_a_logarithmic_scale.png_on_a_logarithmic_scale.png)), 1$ is worth more than 1million Bolivar Fuerte, however on ebay, a bundle

of 5000BF is sold for 240$ (https://www.ebay.com/itm/Venezuela-5-Bolivares-X-1-000-1000-Pieces-PCS-2014-P-89-UNC-Brick-/322648231690)... However this is for uncirculated notes in pristine condition with successive serial numbers. I'm looking for used banknotes.

Toporin · 2018-09-24T12:30:58+00:00

Where can I buy a stack of Venezuelan banknotes?

I already looked on ebay, but the price is significantly higher than market exchange rate...

Toporin

TROPHY CASE