Coinkite / COLDCARD primary-source snapshot
Fetched: 2026-05-01 UTC
1) Official Coinkite homepage
Source: https://coinkite.com/
Selected excerpts from the official site:
Coinkite is a leader in security and hardware manufacturer
Maker of some of the most iconic Bitcoin products, such as OPENDIME, COLDCARD, BLOCKCLOCK, SATSCARD, TAPSIGNER and SATSCHIP.
Additional signals from the source:
- The homepage is the clearest top-level source for understanding that Coinkite is a broader Bitcoin hardware-and-research company, not just the maker of one wallet
- The product lineup is important for categorization because it spans signing devices, bearer-style bitcoin products, backup products, data displays, and operator tooling
- The site also links to open-research and verification-adjacent properties, reinforcing the company’s unusually public research posture
2) Official COLDCARD homepage
Source: https://coldcard.com/
Selected excerpts from the official site:
COLDCARD is a Bitcoin-only hardware wallet made by Coinkite since 2017.
It stores private keys in dual secure elements, signs transactions fully air-gapped, and runs open-source firmware you can verify yourself.
Transactions are transferred via MicroSD card, NFC, or QR codes using the PSBT standard (BIP174).
Additional signals from the source:
- This page is the clearest current product-positioning source for the Bitcoin-only, airgapped, and dual-secure-element architecture
- The duress-PIN, Brick Me PIN, login-countdown, and BIP39-passphrase sections are useful because they show Coinkite treating coercion resistance as part of the product design rather than a marketing afterthought
- The same page also highlights airgapped setup, backup, firmware upgrades, and multisig setup, which makes COLDCARD look like an operational self-custody stack rather than a narrow signing dongle
3) Official docs portal
Source: https://coldcard.com/docs/
Selected excerpt from the official docs:
Here you will find our official documentation for the COLDCARD as well as community guides and plenty of other resources.
Additional signals from the source:
- The docs portal is a useful top-level source because it confirms Coinkite maintains an active documentation surface beyond product marketing
- Even this landing page signals the project is documentation-heavy and designed for ongoing operator / power-user workflows
4) Firmware repository
Source: https://raw.githubusercontent.com/Coldcard/firmware/master/README.md
Selected excerpts from the official repo:
Coldcard is an Affordable, Ultra-secure & Verifiable Hardware Wallet for Bitcoin.
To have confidence this source code tree is the same as the binary on your device, you can rebuild it from source and get exactly the same bytes.
Additional signals from the source:
- The firmware README is one of the strongest primary sources for categorization because it documents reproducible builds, tagged releases, the desktop simulator, and the broad code organization for real hardware and test environments
- The same repo also exposes Q/Mk shared code, immutable bootloader boundaries, and build instructions for both simulator and hardware targets, which indicates a serious public engineering surface
- Reproducible exact-byte verification is especially important because it materially differentiates Coinkite from hardware vendors that publish code without a clear verification path
5) Internal technical docs
Source: https://raw.githubusercontent.com/Coldcard/firmware/master/docs/README.md
Selected excerpts from the official repo:
These docs are meant for you hackers out there… but also for anyone who wants to understand why it’s safe to put your moneys into Coldcard.
Huge and detailed discussion of PIN codes and the security element that holds the secrets.
Additional signals from the source:
- This README is unusually revealing because it openly maps security-relevant documentation covering PIN design, encrypted backups, developer access, Seed XOR, limitations, and Bitcoin Core / Electrum usage
- The breadth of the docs suggests Coinkite should be cataloged as self-custody infrastructure with public operator education, not only as a hardware vendor
6) Hardware details repository
Source: https://raw.githubusercontent.com/Coldcard/firmware/master/hardware/README.md
Selected excerpts from the official repo:
This directory contains enough information for you to be able to build your own Coldcard from off-the-shelf parts.
We are sharing this information for the benefit of security researchers who wish to analyse the Coldcard more completely.
Additional signals from the source:
- The hardware README is especially important because it documents published schematics and BOM files for multiple COLDCARD revisions
- Coinkite explicitly frames these disclosures as research/testing material and withholds commercial reuse rights, which is an important nuance when assessing openness versus reproducibility
- Public hardware documentation of this depth is a strong signal that the company expects independent inspection of its security claims
7) CKBunker operator tooling
Source: https://coinkite.com/
Selected excerpt from the official site:
CKBunker is a python program that you run on a computer attached to a Coldcard. It will setup and operate the Coldcard in “HSM Mode” where it signs without a human pressing the OK key.
Additional signals from the source:
- This is an important clue that Coinkite’s product surface includes operator / automation workflows in addition to consumer self-custody
- It helps explain why the company is better understood as a Bitcoin security-hardware stack rather than a single retail-wallet product
Notes
- Coinkite / COLDCARD appears best cataloged as bitcoin hardware-wallet infrastructure / reproducible-firmware signing stack / self-custody security hardware / bearer-bitcoin device ecosystem.
- No canonical standalone whitepaper or litepaper surfaced in this pass.
- The most useful primary sources are the Coinkite homepage, the COLDCARD homepage, and the public firmware/docs/hardware repositories.