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Questions tagged [coldcard]

Coldcard is an open source hardware wallet built by Coinkite. A hardware wallet (or hardware signer) generates, stores and signs with cryptographic keys.

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What is the difference between PSBT support in Coldcard and Trezor?

The 10x Security Bitcoin Guide says that the only two hardware wallets support BIP174 (partially signed Bitcoin transactions, or PSBT). However, this Reddit thread says that "You can use PSBT ...
Sergei Tikhomirov's user avatar
4 votes
2 answers
635 views

Need help moving funds from legacy address, Coldcard won't sign psbt

I'm in needs of help moving funds from an legacy address, single sig: I exported my Coldcard's xpub to Bluewallet. Bluewallet derived an address from that xpub onto which I received funds. ...
honeypotGhost's user avatar
4 votes
1 answer
2k views

What is an extended fingerprint (xfp) and how does it differ from an xpub?

Coldcard requires the xfps of all of its cosigners to be able to verify and sign multisig transactions. Providing the coldcard with just the xpubs is not enough, which I believe to mean that the xfp ...
paddy's user avatar
  • 195
3 votes
0 answers
366 views

Verify Receive and Change Addresses

I run a coldcard with Electrum and Electrum-Personal-Server. As I understand it, we use hardware wallets because we don't trust our laptops. However, I've only been able to verify the sending ...
McMurdo's user avatar
  • 31
2 votes
1 answer
123 views

What does bitcoin.org mean when they say about Coldcard Wallet "the final software was not built deterministically like Bitcoin Core"?

I am looking at hardware wallets to store my Bitcoins, and Coldcard Wallet Mk3 seems like a great option. However, at looking at info about it at bitcoin.org, it says that the software is not built ...
Ander Aristondo's user avatar
1 vote
2 answers
402 views

Is multisig wallet simply a combination of many singlesig wallets?

I’m trying to create a multisig wallet for the first time. My pre-understanding is that multisig wallet is simply a combination of many singlesig address. So for example I have 3 existing singlesig ...
bbnn's user avatar
  • 247
1 vote
1 answer
45 views

Why these 2 pubkeys start equal?

I generated a seed into my coldcard, wrote down its pubkey: xpubABCDEFGHIKL--------------------------------------------------- then I erased everything and generated a new seed, and wrote down its ...
Guerlando OCs's user avatar
1 vote
1 answer
268 views

Should different brands of hardware wallets be used in multisig setups?

Is there genuinely a compelling reason to use different brands of hardware wallets in multisig setups? I am contemplating using a series of Coldcard hardware wallets in a multisig setup but some ...
Guru Josh's user avatar
  • 171
1 vote
0 answers
153 views

How to best practice restoring a wallet in bitcoin core

I have a test wallet in bitcoin core that I want to play around with and get comfortable with before I move my btc from blockstream green wallet. I primarily use that wallet because so far it has been ...
Anders Kitson's user avatar
1 vote
1 answer
807 views

Is it possible to use Electrum to create a multisig wallet with a trezor and an airgapped coldcard?

I set up a 2-of-3 multisig using Electrum, a Trezor, and a Coldcard. During testing, I ran into issues using the Coldcard to sign. My approach: (On Electrum) File -> New/Restore -> Multi-signature ...
paddy's user avatar
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0 votes
1 answer
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Coldcard sparrow

I experienced what the user on Reddit here experienced. Any idea why this happens ? https://www.reddit.com/r/coldcard/comments/17epqk8/040_bitcoin_taken_instantly_from_my_coldcard/ Doesn’t look like ...
caliGeek's user avatar
  • 103
0 votes
1 answer
186 views

How do you import an air-gapped created multisig wallet from Coldcard to Electrum?

I went through the process of creating a 3/5 multisig with coldcard, air gapped. I generated an electrum wallet file, but now I'm struggling to figure out how I use electrum to import the multisig ...
karns's user avatar
  • 135
0 votes
1 answer
101 views

When using a hardware wallet, how do I know that the change address is one that I own?

When signing a transaction on my coldcard, I see a change address that is not listed (at least on the first 30 addresses) on my coldcard. I believe coldcard would only allow me to sign a transaction ...
Guerlando OCs's user avatar
0 votes
0 answers
33 views

Sparrow Wallet - PostMix Tab

How do you load the postmix tab in Sparrow wallet. The documentation makes little to no sense on how to load the postmix tab
caliGeek's user avatar
  • 103
0 votes
1 answer
312 views

Transferred coin from Ledger Live to Sparrow

I transferred my bitcoins from Ledger Live Wallet to Cold Card. When I launch Sparrow, it shows the spent amount from ledger live and the coins received to their respective addresses. Is it expected ...
caliGeek's user avatar
  • 103
0 votes
1 answer
247 views

How can I recover funds recovery from coldcard?

I recently bought a Coldcard mk4 and did some tries to understand how it works. I moved a tiny amount to test it but now I can't recover it. What I think happened is: I exported the wallet created ...
difismak's user avatar
0 votes
2 answers
412 views

Sent funds to ColdCard BIP 32 address, how can I transfer them out to a different address?

The Setup I purchased a genuine ColdCard, verified its authenticity, set it up, backed up my key and all that good stuff. I then wanted to transfer some BTC from an exchange but I was being paranoid ...
BearsEars's user avatar
  • 111
0 votes
1 answer
881 views

Setting Up Multisig Correctly

I'm looking into setting up a multisig setup using Sparrow, and wanted to see if anyone can find any flaws in my set up, and potentially accessing my funds if I lose a key. set up = 2 of 3 Key store 1 ...
Paranoid BTC Novice's user avatar
0 votes
1 answer
250 views

Is this scheme for multisig audit of Trezor + Coldcard ok?

My plan is to make a multisig between coldcard and trezor. I want to audit and verify that I indeed own the 2 keys of these wallets, using a raspberry pi zero (no wifi/bluetooth by definition) on a ...
Gatonito's user avatar
0 votes
1 answer
157 views

Can I generate multisig addresses directly in the coldcard?

According to coldcard's multisig video tutorial: https://www.youtube.com/watch?v=OMpZ5heLsRg I need to export the 3 xpubs and then create a multisig wallet in each coldcard using these 3 xpubs. Then ...
Guerlando OCs's user avatar
0 votes
2 answers
742 views

My first bitcoin transaction with core and coldcard

I use coldcard and bitcoin core 0.20.1. I have checked how to do it with HWI at https://github.com/bitcoin-core/HWI/blob/master/docs/bitcoin-core-usage.md. It appears more complex than needed. With ...
Cucco's user avatar
  • 3