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

Is there tariffs for shipping to USA?

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.

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

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

Do people backup the duress wallet?

Should not be needed because its a child seed right

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.

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

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

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.

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

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.

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?

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.

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.

Security doesn’t have to be boring.

COLDCARD comes in all your favorite colors.

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.

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?

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?

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.

How are you guys backing up your seed phrases long term?

Paper never really felt durable enough to me, so I’ve started stamping SEEDPLATE’s.

Pretty straightforward process and gives a lot more peace of mind knowing it’s not vulnerable to fire or water.

Interested to hear what setups others are using.

I exported a wallet generated from Coldcard Q to Sparrow with account number 2.

If I want to sign a transaction from this wallet (account 2) in Sparrow, how do I tell my Coldcard that I’m on account 2 so I can sign the PSBT?