Bitcoin-only security
No altcoin dashboard. No custody account. Coinkite products are built for people who hold and verify bitcoin themselves.
Bitcoin Security and Fun Devices
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Made in Canada
Coinkite is a leader in Bitcoin security and hardware, est. block 141,000.
Maker of some of the most iconic Bitcoin products, such as OPENDIME, COLDCARD, BLOCKCLOCK, SATSCARD, TAPSIGNER and SATSCHIP.
Don't Trust–Verify
Maker of some of the most iconic Bitcoin products, such as OPENDIME, COLDCARD, BLOCKCLOCK, SATSCARD, TAPSIGNER and SATSCHIP.
Don't Trust–Verify
Security and self-custody tools
What is Coinkite?
Coinkite is a Canadian Bitcoin hardware company founded in 2012. It makes tools for self-custody: COLDCARD signing devices, OPENDIME physical Bitcoin bearer devices, BLOCKCLOCK displays, NFC cards, SATSCHIP chips, steel seed backups, and arca, a personal data haven for critical secrets.
Air-gapped workflows
COLDCARD signing flows keep private keys on the device while transactions move through offline-friendly workflows.
Physical Bitcoin tools
OPENDIME, SATSCARD, TAPSIGNER, and SATSCHIP turn key handling into physical objects you can hold, gift, tap, verify, or embed.
Coinkite product guide
Start with the job you need done: sign, gift, tap, display, back up, safeguard critical secrets, or power a device offline.
Coinkite FAQ
Who makes COLDCARD?
COLDCARD is made by Coinkite, a Canadian Bitcoin hardware company founded in 2012.
Is Coinkite Bitcoin-only?
Yes. Coinkite focuses on Bitcoin self-custody hardware, physical Bitcoin tools, and related security products.
What is OPENDIME?
OPENDIME is a small USB stick that can hold bitcoin as a sealed physical bearer instrument.
What is TAPSIGNER?
TAPSIGNER is an NFC card that stores a Bitcoin private key and signs mobile wallet transactions with a tap.
- Best for
- Bitcoin hardware wallet self-custody
- Helps by
- Signs transactions while keeping private keys offline.
Full-keyboard COLDCARD for offline Bitcoin signing.
COLDCARD Q adds a QWERTY keyboard, larger screen, QR scanner, MicroSD, USB-C, and NFC options for self-custody workflows.
- Best for
- Bitcoin hardware wallet self-custody
- Helps by
- Signs transactions while keeping private keys offline.
Verifiable, Bitcoin-only signing device.
COLDCARD Mk5 signs Bitcoin transactions while private keys stay on the device, away from networked computers.
- Best for
- Critical secrets and recovery paths
- Helps by
- Keeps encrypted secrets resilient across places, people, and time.
A physical digital safe for critical secrets.
arca is a personal data haven for seed words, recovery codes, passwords, instructions, and files that must not depend on one phone, cloud account, or person.
- Best for
- Physical Bitcoin bearer gifts and hand-to-hand transfers
- Helps by
- Lets bitcoin move like a sealed physical bearer instrument.
Physical bitcoin you can pass hand to hand.
Load it, verify it, and pass it along. The private key stays sealed until someone breaks the seal to spend.
BLOCKCLOCK® mini
- Best for
- Bitcoin data display
- Helps by
- Shows block height, price, and other Bitcoin network data.
Our second Bitcoin Data Display.
Track #bitcoin price, see blocks as they are published and connect Opendimes to display balance, fiat value, and deposit QR.
BLOCKCLOCK® micro
- Best for
- Bitcoin data display
- Helps by
- Shows block height, price, and other Bitcoin network data.
Our smallest Bitcoin Data Display.
Track the bitcoin block height, price, and other metrics right on your desk!
SEEDPLATE®
- Best for
- Seed phrase backup
- Helps by
- Stores seed words on steel for durable backup.
Write seed words on steel, not paper.
A 2mm steel backup plate for 24-word or compact 12-word seed phrase storage.
TAPSIGNER®
- Best for
- NFC mobile wallet signing
- Helps by
- Stores a Bitcoin private key on a card and signs by tap.
A Bitcoin private key on an NFC card.
Tap with a compatible mobile wallet to sign transactions while the key stays on the card.
SATSCARD™
- Best for
- Reusable Bitcoin cards
- Helps by
- Gives Bitcoin users a cash-like NFC card experience.
Reusable physical bitcoin cards.
SATSCARD brings the OPENDIME bearer-instrument idea to an NFC card with multiple slots for reuse.
SATSCHIP™
- Best for
- Bitcoin art and authentication
- Helps by
- Embeds a Bitcoin private key into artwork or physical objects.
A Bitcoin key you can embed in art.
The chip binds a private key to a physical work so the buyer can verify the piece and control the key after sale.
COLDPOWER™
- Best for
- Air-gapped COLDCARD power
- Helps by
- Powers low-power USB devices from a 9-volt battery without USB data.
Power COLDCARD without a computer USB port.
Run low-power USB devices from a standard 9-volt battery when you want power, not data.
CKBunker
- Best for
- COLDCARD HSM signing workflows
- Helps by
- Operates COLDCARD in HSM mode for policy-controlled signing.
Run COLDCARD HSM signing from a policy-controlled machine.
CKBunker sets up and operates COLDCARD in HSM mode so approved transactions can be signed without pressing OK each time.
Websites
BitcoinTreasuries.net
Track bitcoin held by companies, funds, ETFs, governments, and other entities.
Updated in one place for treasury researchers and Bitcoin market watchers.
Bitcoin.holiday
Remember the dates that shaped Bitcoin,
from the white paper and halvings to exchange failures, protocol milestones, and community holidays.
BitcoinMemes.info
Bitcoin memes for every occasion.
We've collected them all and aggregated them in one place. Browse, share, and contribute your own.
Bitcoin.review
Catch up on Bitcoin updates and commentary
from Coinkite and the wider Bitcoin community.
BitcoinBounties.org
A collection of bounties for #Bitcoin projects.
The #Bitcoin bounty list for devs.
BitcoinBinary.org
Reproducible build proofs for Bitcoin projects.
Check whether released binaries match the source code they claim to come from.
Blockwatch.live
Turn Bitcoin price and block data into a display feed,
including Opendime balances, fiat values, and deposit QR codes on small screens.
BitcoinBlackFriday.org
Find Bitcoin Black Friday deals
from wallets, services, merchants, and builders across the community.
BinaryWatch.org
Fetch and monitor public Bitcoin binaries,
with alerts when tracked binaries change.
Checkmsg.org
Validate Bitcoin signed messages
including ASCII armor and whitespace edge cases.
Open research for the Bitcoin community
Active experiments, tools, and research notes for safer self-custody.
