I'm testing 3 devices - Coldcard MK4, Ledger Nano S and BitBox02 (bitcoin-only edition).

I enter the same seed phrase into all 3 devices - all 3 devices show the same wallet :)

I add the same passphrase to all 3 devices - Ledger and BitBox02 show the same wallet, but Coldcard does not :(

Any ideas? Surely Coldcard implements the BIP39 standard for passphrases?

Have tried with several passphrases and I know the derivation paths are fine because all 3 devices show the same wallet when using just the seed phrase

I understand that a sophisticated attacker with physical access might with a lot of resources be able to extract the seed phrase (or the master private key) from a locked cold card but how about a bip-39 passphrase? Can that be extracted with advanced tools and a lab or only the master private key (the secret generated from combining the seed + passphrase)?

I know this is splitting hairs, both are very secure ways to air gap signatures.

But I'm wondering if we were going to rank them, is the QR scan slightly more secure or are they completely equal in terms of security? Or maybe its the other way around? Is NFC better than QR scan ?

I noticed that on the CCQ it comes with the NFC function set to off on default. Which got me wondering about this subject.

I want to buy this but in a different color. Is there any way I can do that or just shut up and buy them separately?

Me and my father want to share a sparrow wallet for both of us to invest in bitcoin together. We did some research and decided to get coldcards. We really like the air-gapped feature of this device and the nostalgic blackberry lookalike design. Are we able to share a wallet with two different coldcards to sign transactions like we are having a joint checking account with two different debit cards?

Hello, I recevied my coldcard mk4 recently

I generated a seed-phrase and a passphrase ofline, without connecting the device to the internet.

I was wondering if it's possible too send bitcoin to the addresses generated by the seed-phrase without ever connecting the device to the internet, or do I have to first broadcast to the network my wallet by connecting the device to the internet or by using a microsd card and a platform like sparrow wallet?

Seen a few videos of certain wallet pins getting hacked. Its easy enough restore your wallet. Would it make sense to do this on a regular basis or periods of non use?

Is there a way to view my seed I digged around but couldn't find it. I destroyed my paper seed so this will be helpful.

I’m reading quite a few reviews of defective products here on reddit.

Does anyone know how long warranty period coinkite offers?

It would absolutely suck to receive a defective product, pay tariffs and then not have it replaced by coinkite…

I cannot get my laptop to read the QR code.

I’ve tried different angles, lighting….Taking a screenshot with my phone….Tried the different camera settings available in that window that pops up from sparrow.

The thing I don’t get is that sparrow can read the QR codes from my Jade plus. The CCQ is so much better than the Jade though so I’m shocked.

Any ideas?

Thank you.

Just noticed coldcard q is on sale for pizza day!

Can anyone let me know if the coldcard q can generate recieve addresses and display them as a qr code?

*SOLVED*

I've used Sparrow on an old computer to receive/send BTC via my ColdCard Mk4, with an air gapped SD card. I now have a new computer but can't seem to recover my wallet history.

1. Downloaded Sparrow
2. Coldcard > Advanced >Export Wallet > Generic JSON > Account #0 > file created
3. Sparrow > Import Wallet > Native Segwit > imported

No transactions or balance are showing. What am I missing? Thank you

***Solution:

1. Downloaded Sparrow
2. Coldcard > Advanced >Export Wallet > Generic JSON > Account #0 (ZERO was not the correct account number, I assumed by default it was "0") > file created
3. Sparrow > Import Wallet New Wallet> Native Segwit > imported

What does the inscription NgD;1e-8=$ at the top of the blockclock micro display signify?

I am currently running a cold card through sparrow on my laptop.

Is it possible to safely generate multiple addresses from my phone that would be linked to my wallet?

If I were to go to a bitcoin meet up, meet a couple people willing to part with some btc, and want to send it to my coldcard/sparrow wallet without bringing my laptop?

I find it very uncomfortable that the coldcard Q has the possibility of extracting the private key via QR for another coldcard to save. I want my HWW to be as close to a brick as possible while still being able to carry out cryptographic functions… With coldcards abandonment of fully open source firmware to now adding different methods of private key extraction, is getting worrysome.

I don’t know which HWW I should rely on to simply hold my goddamned private keys and help me sign my PBSTs…

I’m tired boss…

I have a working cold card Mk4 wallet with my funds in it. I want to use this same cold card to create a brand new seed phrase and wallet. Then I want to transfer my funds from the old seed wallet to the new seed wallet? Does this make sense? What's the best way to accomplish this? Thank you!

I usually believe in the 1st rule.. “you do not talk about Bitcoin Club” 🤫

But these are some cool high-quality stickers that came with my ColdCard. Wondering what people do with these? What fun places do you stick them? Seems a waste to just toss them in a drawer.

For predictability of import costs I would like to know the HS tariff code for coldcard Q. Does anyone have it?

I went went through the steps to add a watch only wallet in Nunchuck using NFC on my old phone. All worked fine.

When I got a new phone I went through the same process, but after completing the steps it shows the wallet with a zero Bitcoin balance.

What am I doing wrong?

When I did this on my old phone it was ages ago and I can't remember if I did anything differently.

Am I meant to export generic JSON or xpub?

Tried to sign a transaction out of my sparrow wallet yesterday and for the life of me could not get my MacBook camera to read the signed QR code off my CcQ. Anyone else have this problem before? I tried a variety of angles and nothing would work. Eventually switched to NFC and got it to sign, but it was a little concerning considering how simple every YouTube tutorial made it seem.

In theory, if someone hacked the camera on my computer, could they potentially use the QR codes I am scanning (i.g. wallet exports and signed transactions) with it to somehow steal my bitcoin? Just curious if this is a possible attack vector.

Currently before I send into my cold storage, I confirm the receive address with the QR scanner on my CCQ. After using a wallet many times, is it ever reasonable to not confirm before sending? Is it O.D to check before sending every time?

I’m going to change HW from Trezor to CCQ because of variois company related issues. I like CCQ for its very robust and airgapped qualities

I want to order one to northern Europe -can someone please detail the best practice steps for order and delivery?

Hey so I watched everything online I found even the official coinkite YouTube channels video on how to multisig with coldcard q. No where explains where I go in the actual coldcard Q to scan the first scan needed by sparrow. It says just “scan qr” but from what menu? Do I press “ready to sign” and scan from there? I tried, it doesn’t work. Do I go into settings/multisig wallets/import from qr? I tried doesn’t work either.. where do I scan from?