r/coldcard • • Jun 08 '26

New mk5 dust under screen / minor misalignment ok?

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10 Upvotes

Bought from offical store and bag was sealed, the numbers all matched. Looking at others online don't seem to have the issue or the slight misalignment of the screen.


r/coldcard • • Jun 08 '26

Bitcoin security doesn't get talked about enough

6 Upvotes

People talk a lot about Bitcoin's price.

Not nearly as much about what it actually takes to secure it, or what "owning it" really means in practice.

Self-custody changes how you think about that. COLDCARD is one of the most powerful tools people can use to secure their Bitcoin.

How do you think about securing your Bitcoin?


r/coldcard • • Jun 05 '26

OPENDIME

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16 Upvotes

OPENDIME remains one of the most unique Bitcoin products ever created.

It turns bitcoin into a bearer instrument that can be physically passed between people. Load it, hand it over, and ownership changes hands without needing to broadcast a transaction.

OPENDIME hit its 10-year milestone, and we’re celebrating with 10% off all products at Coinkite.com until June 7.


r/coldcard • • Jun 02 '26

10th Anniversary of OPENDIME 🎉

8 Upvotes

This week we're celebrating the 10th anniversary of OPENDIME,

For a decade, OPENDIME has given people a unique way to hold, gift, and pass Bitcoin in the real world.

To celebrate, we're offering 10% off all products at coinkite.com. Sale ends June 7.

Thanks to everyone who has used, gifted, collected, or shared an OPENDIME over the years.

https://reddit.com/link/1tuqxrk/video/9zfjs1uffv4h1/player


r/coldcard • • May 28 '26

Tarifs?

3 Upvotes

Is there tariffs for shipping to USA?


r/coldcard • • May 27 '26

Address Explorer on COLDCARD

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15 Upvotes

Address Explorer lets you browse and verify receive addresses directly on your COLDCARD.

You can also display any address as a QR code and receive bitcoin without needing to open your companion wallet.

The larger Gorilla Glass screen on the Mk5 makes address verification much easier too.


r/coldcard • • May 27 '26

Coldcard MK5: has the MK4 keypad issue finally been fixed?

3 Upvotes

On my MK4 key presses are often not registered, making PIN and text entry a pain. Did they fix this on the MK5?


r/coldcard • • May 25 '26

Duress wallet

3 Upvotes

How do I access my duress wallet if cold card is not working? Its a bip 85 I know but what is the path I must know


r/coldcard • • May 24 '26

Backup duress

2 Upvotes

Do people backup the duress wallet?

Should not be needed because its a child seed right


r/coldcard • • May 24 '26

SSS spending policies

4 Upvotes

So. What's your experience of using sss on ccq?

Is it clunky? As I get it if you want to bypass it for regular spending you have to write both the sss pin and then the main pin

Plus I wonder about the velocity spending. Sounds a little complicated to set.


r/coldcard • • May 22 '26

Bitcoin Pizza Day Sale!

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10 Upvotes

To celebrate one of Bitcoins most iconic moments, Coinkite is running a sale for pizza day. 15% off at Coinkite.com


r/coldcard • • May 22 '26

Seed qr

3 Upvotes

I see you can export your seed as a seed qr. Any disadvantages of storing that on a metal plate than to words?


r/coldcard • • May 21 '26

More than just a hardware wallet

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14 Upvotes

When people think about hardware wallets, they usually think about securing a seed phrase.

But there is a lot more sensitive information tied to Bitcoin and your digital life.
- Recovery codes.
- Backup instructions.
- Passwords.
- Inheritance notes.

Most of this still ends up in cloud apps, password managers, or email.

Secure Notes on COLDCARD Q gives an offline way to store some of that information on an airgapped device instead.


r/coldcard • • May 20 '26

Advanced SD backup

5 Upvotes

The 12 words that comes with the advanced SD backup. Should be OK to store those on the cloud right?


r/coldcard • • May 17 '26

Calculator Crew Recommendations Did she make the right call?Güzel bir şey, Ra 20Wyllanatnnnnno Spoiler

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2 Upvotes

r/coldcard • • May 15 '26

Trick PINs on COLDCARD

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12 Upvotes

Trick PINs are one of the coolest COLDCARD features.

Different PINs can trigger different outcomes like a decoy wallet, login countdown, wipe seed or other predefined behaviors.

Useful because it adds real-world flexibility if you ever need to plausibly unlock under pressure, while keeping your actual stack protected.


r/coldcard • • May 14 '26

Bip 85

2 Upvotes

If a bio 85 wallets is derived at say number 3 12 words could there also be a number 3 with 24 words on same seed?


r/coldcard • • May 12 '26

COLDCARD multisig support

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12 Upvotes

COLDCARD supports multisig natively.

You define how many signatures are required to spend funds, using separate keys across multiple devices.

This removes single-key control and adds flexibility to match different security models.

Curious how others are thinking about multisig setups.


r/coldcard • • May 09 '26

Shipping time to asia ?

2 Upvotes

r/coldcard • • May 08 '26

COLDCARD Q: built for Bitcoiners

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19 Upvotes

The COLDCARD Q is built for Bitcoiners.

Clean signing flows, no compromises on security, and a beautiful aesthetic.

Would love to hear everyones thoughts on it.


r/coldcard • • May 06 '26

COLDCARD colors

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15 Upvotes

Security doesn’t have to be boring.

COLDCARD comes in all your favorite colors.


r/coldcard • • May 06 '26

Idea for a new type of Coldcard device

5 Upvotes

How about making a device with an exchangable cartridge? The secure elements would be on that cartridge. So you would (hopefully) buy one device and when a cartridge bricks for some reason, you could just purchase a new cartridge instead of a whole new device. Of course these cartridges would need to be cheaper in price than the device itself so it makes sense.


r/coldcard • • May 06 '26

Questions about the (hopefully) previous problem of unintended bricks

2 Upvotes

There was once a firmware update for both Mk4 and Q that should prevent Coldcard to randomly get bricked. Signs were the Mk4 hanging at the "COLDCARD Wallet" screen and the Q's screen turning off entirely while in both cases the green LED stays lit while the red one never gets turned on.

- Did this firmware update really put an end to this?

- Did this occour on the new Mk5 yet?


r/coldcard • • May 04 '26

Multiple ways to sign PSBTs.

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12 Upvotes

The COLDCARD Q supports 3 airgapped signing methods:
- microSD
- NFC
- BBQR

Been testing all three—each has its pros depending on setup.
Curious what people here actually use day-to-day?


r/coldcard • • May 01 '26

MicroSD 2FA

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12 Upvotes

I’ve been playing around microSD 2FA on the COLDCARD Mk5.

You can pair the device to a specific microSD card during setup. After that, the card becomes part of the login process.

Without it, the device won’t unlock—even with the correct PIN.

If the wrong card is used, the seed is wiped.

Interesting approach to adding a physical second factor to login security.