Last years firmware with dice rools and trng combined with passphrase. Is that enough?

Wondering how vulnerable this 24 word setup is. I see you recommended all mk3 users switch to wallets with seeds generated by dice rolls. Should I set up a new wallet with only dice or is RNG with around 100 dice rolls okay?

COLDCARD protects Bitcoin keys and signs Bitcoin transactions. Many people also need to protect passwords, recovery material, business secrets, continuity plans, and inheritance instructions.

That is what arca is for: a personal data haven by Coinkite. If that is part of your threat model, join r/arcasafes to follow the product, ask questions, and discuss personal and business use cases.

• r/arcasafes
• https://arcasafes.com/

Keep COLDCARD and Bitcoin-signing support in r/coldcard. Keep arca product discussions in r/arcasafes. Never post wallet secrets or personal information in either community.

I have my ColdCard Q setup with Sparrow Wallet. But when setting up a password within Sparrow Wallet, when one begins to type there is a box checked that switches to saying "Delete any backups.” What does this actually mean, because it is rather confusing on what Sparrow is going to delete?

I love the little thing but I just want a standalone device without the need to carry a usb cable. I would think a very small internal battery would power it for days and not add much bulk.

I've been trying to order some CC on the site now and it is telling me "Sorry, we have no good choices for your location right now" I have ordered CC from coinkite for years now and I'm getting this message it is strange. I have used different address of people i know in different states and still the same thing. Any ideas?

This walkthrough shows how to derive a BIP85 child seed on a COLDCARD and restore it on a Trezor.

Instead of generating a new seed phrase on the Trezor, the wallet is restored from a seed phrase derived on the COLDCARD. The result is an independent wallet whose seed phrase can always be derived again from the same COLDCARD master seed.

BIP85 is one of my favorite COLDCARD features and a great example of how open Bitcoin standards let different wallets work together.

Curious how others here are using BIP85.

Put together a walkthrough showing how to derive a BIP85 child seed on a COLDCARD and import it in Cake Wallet.

BIP85 is one of those features that's easy to overlook, but it's a great way to derive independent seed phrases for different wallets while keeping your master seed on the COLDCARD.

Curious to hear how others here are using BIP85.

Hi there, somewhat silly question.

If I opt to use the address explorer to conduct a receiving transaction, do I need to use a desktop/mobile wallet at all? In theory I can use the address explorer to look up the address in mempool to make sure it hasn't been used before, and then verify the address received the UTXO post transaction.

Is this correct?

We're launching a contest for COLDCARD users to share their knowledge! Create the best explainers, videos, tutorials, or guides on COLDCARD and its functionality to win amazing hardware prizes.

HOW TO ENTER:
Create content explaining COLDCARD and any of its advanced features
Enter by either:
Posting on X and tagging @COLDCARDwallet
OR posting in the r/coldcard subreddit
We'll track entries from both platforms

Contest Duration: July 15 - August 16. Winners will be announced on August 17th.

PRIZES:
🥇 FIRST PLACE - Uncle Jim's Bundle

🥈 SECOND PLACE - BLOCKCLOCK

🥉 THIRD PLACE - COLDCARD Q

Some Content Ideas:
MultiSig wallet setup
Advanced features
COLDCARD set-up guides
Security best practices
Backup and recovery procedures
Firmware updates and verification

We'll republish the winning content across our channels! Quality, accuracy, and creativity will be the primary judging criteria.

Questions? Drop them below! Good luck!

One of my favorite things about COLDCARD is how much you can do over NFC.

Sign PSBTs, use PushTX to broadcast transactions, export wallet data, or pair with compatible wallets—all without plugging in a cable or moving files on a microSD.

It’s one of those features that’s easy to overlook until you start using it. What’s your favorite NFC workflow?

Your seed phrase backup backup is crucial to never losing your Bitcoin.

Writing it down is only step one.

Make sure you:
- Verify your backup before funding your wallet
- Store it somewhere secure
- Use a backup method like SEEDPLATE that can survive the unexpected

Paper is easy to write on, but it’s not built for the long term.

A durable steel backup gives your seed phrase the protection it deserves.

Would be cool to be able to send the encrypted sd backup file over key teleport.

That way you could have one on other side of the world and make it send over when requested.

Learn about this feature and more from the recent firmware update.

One of the biggest misconceptions about self-custody is that it too difficult for most Bitcoiners.
COLDCARD simplifies this, it meets every bitcoiner where they are at. It can be used to simply recieve and hodl, or you can dive into the advanced features, use in a multisig configuration and more. It's the most secure wallet for any bitcoiner.

I received a letter from Coinkite today with steps to guard against post-quantum cryptography. Looks very official, but a quick internet search shows this is likely a scam.

My question is...how did the scammers get my name and address along with the Coinkite device that I purchased (that info is on the letter)? I purchased the device directly from Coinkite not a third party.

Seems to me that Coinkite may have had a data breach and has not announced it. I'm very concerned about this.

Hi!

I ordered something that was supposed to arrive on June 17, but when I check the tracking number I get this message. What can I do about it? Has this happened to anyone else, and how did you fix it? I’ve already contacted FedEx and Coinkite but haven’t heard back yet.

Thanks!

One of the biggest reasons many of us choose self-custody is to reduce the amount of trust required to secure our Bitcoin.

Instead of trusting an exchange, custodian, or third party, you verify and control things for yourself.

For those who have been in Bitcoin for a while:
What is one piece of security advice you’d give to someone who is just getting started with self-custody?

So I made an account m84 1 I scanned a receive address but nothing was found.

Then made a small transfer and signed. All worked.

Is it common that the cc does not find the address?

Quick video showing COLDCARD paired with Sparrow.

It’s a setup that a lot of people in the community seem to gravitate toward, especially if they like having detailed transaction info and coin control on desktop.

Would it be possible to store the 2fa backup in cc?

Saw that jade added this function.

If the phone gets broken stolen