6
votes
Accepted
What is the difference between PSBT support in Coldcard and Trezor?
The Coldcard handles PSBT directly and natively. A PSBT can given to the device by writing it to a microSD card and inserting the card into the device. It will be able to load the PSBT and process it ...
- 72.2k
5
votes
Need help moving funds from legacy address, Coldcard won't sign psbt
It sounds like you imported only the xpub without the information that identifies where the xpub came from. This information, known as origin information, contains the fingerprint of the master key ...
- 72.2k
3
votes
Accepted
Why these 2 pubkeys start equal?
The encoding of an xpub contains multiple pieces of data:
A 4-byte fixed prefix that results in the "xpub" prefix after encoding
Depth in the tree (0 for all master xpubs, 1 for children ...
- 110k
3
votes
Accepted
What does bitcoin.org mean when they say about Coldcard Wallet "the final software was not built deterministically like Bitcoin Core"?
Some security sensitive pieces of software like Tor, Debian and Bitcoin use deterministic builds to increase the safety of binaries for end users. Typically a piece of software will be built from ...
- 15.5k
3
votes
What is an extended fingerprint (xfp) and how does it differ from an xpub?
The fingerprint of a public key is defined in BIP 32 as the first 4 bytes of the RIPEMD160 hash of the SHA256 hash of the public key. The fingerprint of a particular xpub can be gotten from that xpub, ...
- 72.2k
3
votes
Is multisig wallet simply a combination of many singlesig wallets?
There seems to be some variation in the question on wallet vs address. In any event a multisig address is simply a script created by m-of-n public keys (not addresses or wallets). When you build a raw ...
- 5,676
2
votes
Should different brands of hardware wallets be used in multisig setups?
The compelling reason to use different brands in a multisig setup is supply chain risk. Let's say you had a 3-of-5 multisig/threshold setup using brands A, B, C, D and E. A preinstalled vulnerability ...
- 15.8k
1
vote
Need Coldcard CLI doc clarification
Based on the behaviour of their test suite, it should sign with the key at m/5', and not attempt to coerce it into a prefix for a standard path.
- 17.3k
1
vote
Coldcard sparrow
The security of your coins relies on having being able to produce a random number within a large range of possible numbers. A large range is required so that it is infeasible for someone to search the ...
- 72.2k
1
vote
How do you import an air-gapped created multisig wallet from Coldcard to Electrum?
I do not own coldcard devices but this tutorial goes through the whole process of creating a multisig wallet with Electrum.
When you open Electrum for the first time it will ask you to select a wallet ...
- 404
1
vote
Accepted
When using a hardware wallet, how do I know that the change address is one that I own?
Generally payment addresses and change addresses are drawn from separate key derivation chains (cfr. BIP32, which suggests using derivation paths ending in .../0/* for payment addresses and .../1/* ...
- 110k
1
vote
Is multisig wallet simply a combination of many singlesig wallets?
My pre-understanding is that multisig wallet is simply a combination of many singlesig address.
Is my understanding multisig correct?
Not exactly.
If we think of addresses as a locks a single-sig ...
- 1,438
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