u/Subject_Reward

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.

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.

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.

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?

Bitcoin’s price is volatile, which is nothing new to us Bitcoiners.

We’ve seen exchanges come and go, and a lot of people lose Bitcoin just by not self-custodying.

When I think of self-custody I think of holding your own keys and not relying on anyone else.

That’s why my go to is COLDCARD. It eliminates having to trust a third party. It’s widely considered one of the more secure hardware wallets for Bitcoin, and it’s made me appreciate how much peace of mind comes from keeping things simple and self-sovereign.

What finally made you take self-custody seriously?

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.

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.

OPENDIME turns 10: A Decade of Real, Physical Bitcoin.

To celebrate this milestone Coinkite is offering 10% off store wide.

https://blog.coinkite.com/OPENDIME-turns-10/

A lot of people assume self-custody means making everything way more complicated.

But honestly, once you use COLDCARD, you realize a secure setup can still be pretty straightforward.

It meets Bitcoiners wherever they’re at, whether you just want to safely hodl long term or you’re into using multisig, and advanced setups.

Feels like the “secure vs easy” tradeoff isn’t necessary.

Minimizing trust has always been the goal in Bitcoin.
Self-custody is what gets you closer to that, but not all setups are equal.

If you’re doing self-custody, it helps to keep things simple and grounded in first principles:
- prefer wallets with auditable code
- use wallets that support real seed phrase recovery
- stick to tools built on open standards

The goal isn’t complexity, it’s reducing the amount of trust you have to place in anything outside your control.

Don’t trust. Verify.

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.

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