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Coinkite®: @OPENDIME, 1st & only #Bitcoin bearer instrument. @COLDCARDwallet ultra-secure open hardware wallet @theBLOCKCLOCK @TAPSIGNER est. block 141,000

Bitcoin
Joined May 2013
Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)Photo by Coinkite (@Coinkite)
COLDCARD Q uses a dedicated QR scanner module connected internally over a simple two-wire serial link. It can ingest addresses, PSBTs, wallet data, and supported seed formats without USB. coldcard.com/docs/coldcard-q…
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Happy 18yrs #BitcoinWhitePaperDay 📃 For the next 24hrs enjoy 15-20% off many products of our store including #COLDCARD, #BLOCKCLOCK, #SEEDPLATE and #TAPSIGNER store.coinkite.com/store
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Coinkite retweeted
Keep TAPSIGNER. Tap it to sign. Hand SATSCARD over when the bitcoin should travel with the card. Two cards, two jobs.
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For long-term holders who want verifiable firmware and true air-gap signing.

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COLDCARD is a Bitcoin-only signing device. It does not require a COLDCARD account or mandatory companion app. Pair it with compatible wallet software and keep the signing key offline. coldcard.com/mk5
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Coinkite retweeted
Software accumulated a fire debt. Till now the limits of human review let bugs,brittle dependencies and untested assumptions pile up like dry brush. AI security review has now ignited an ecosystem-wide burn. Destructive,but it'll clear the backlog. Software will emerge stronger
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Coinkite retweeted
AWWWWOOOOOOOGAAAAAAA 9.8 severity use-after-free vulnerability in the kernel’s IPv4 TCP stack just landed Time to patch! ubuntu.com/security/CVE-2026…
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My top three HWS in order, explained. I intentionally left out DIY to keep this simple so the DIY people don't need to come at me but I respect you 👍 1. COLDCARD Q @Coinkite - My prized possession. I play with the Q all the time, becoming more obsessed as time goes on. The Q immediately makes most other hardware irrelevant IMO considering all the features and functionality, especially not requiring a companion app for initial setup. There really is something special about the full QWERTY keyboard... I have never regretted buying a CC and features are still being added 🐦‍🔥 2. Frostsnap @FrostsnapTech - By far the best multi sig option there is, as SIMPLE as it gets. Perfect when you don't only have yourself to think about as long as they are geographically distributed properly. These devices give me the same excitement as the Q even though I use them much less. You don't have to worry about internal batteries. They appear as single sig regardless of how many are used. The setup, signing and restoration are magical. Seriously love these things... ❄️ 3. Blockstream Jade Plus @BlockstreamJade - I gave Blockstream a hard time for months after the release of the Jade Plus because of my issues with the camera but that was eventually fixed after 2 or 3 firmware updates. The Jade does not actually force you to use an app although most people are probably better off hosting their own oracle when they can for better reliability. I enjoy the simple, small, lightweight form factor while still incorporating some features like a passphrase, BIP 85, OTP, and stateless which most people don't realize is an option. I do occasionally use liquid too so it's great for that. The oracle is not perfect but I respect @Blockstream for doing something different. The alternative theme options scores the Jade some Aura points. I do feel bad for attacking Blockstream so much in the past so hopefully they will appreciate it still being in my top 3 😇
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Coinkite’s standard data-retention practice is to blank customer records after 120 days, retaining only email and country. Customers can request earlier blanking after delivery. Our August notice explains the current legal-preservation exception: blog.coinkite.com/update-on-…
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I joked about CatCard being the “ColdCard x Mt Gox collab” but after spending weeks going down a self custody research rabbit hole I like this more and more especially as part of a multi-vendor/sig setup. @MagicalTux isn’t getting enough credit for this one, but it’s pretty impressive.
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Multi-vendor multi-sig users today having combined each of these gems into a 3-of-5
"the password you are attempting to use was part of a data breach are you sure you want to continue using it?" drone strike my house man i don't care anymore
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Coinkite retweeted
Authenticity systems have tradeoffs. Remote check is convenient, but concentrate trust & attacker incentives in one key. #COLDCARD chose distributed verification: local checks w/ a clear case, matched bag number, verified firmware & GENUINE|CAUTION LEDs blog.coinkite.com/understand…
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Coinkite retweeted
Keep your seed offline and safe from hacks. Dual secure elements protect every key.

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Authenticity systems have tradeoffs. Remote check is convenient, but concentrate trust & attacker incentives in one key. #COLDCARD chose distributed verification: local checks w/ a clear case, matched bag number, verified firmware & GENUINE|CAUTION LEDs blog.coinkite.com/understand…
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Coinkite retweeted
A clear case is not decoration. It lets you inspect a COLDCARD for a component swap or implant. The tamper-evident bag, anti-phishing words, dual Secure Elements and verified firmware add independent checks. That’s defense in depth. coldcard.com/docs/physical-n…
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Press 2 at the OK TO SEND? screen to open Transaction Explorer. Step through every input being spent and every destination or change output instead of approving from a summary alone. coldcard.com/docs/ready-to-s…
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Coinkite retweeted
Monday, Oct. 12, 2026 update: We remain locked out of @COLDCARDwallet and are still waiting for @X to restore our access.
We are investigating how a post containing a phishing link was published from this account. It has since been deleted. Do not visit or interact with that link. COLDCARD’s only official website is coldcard.com. This account has used offline 2FA with tightly restricted access since 2017. We have contacted @X and are reviewing all account access. We will share further verified updates here.
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Monday, Oct. 12, 2026 update: We remain locked out of @COLDCARDwallet and are still waiting for @X to restore our access.
We are investigating how a post containing a phishing link was published from this account. It has since been deleted. Do not visit or interact with that link. COLDCARD’s only official website is coldcard.com. This account has used offline 2FA with tightly restricted access since 2017. We have contacted @X and are reviewing all account access. We will share further verified updates here.
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Coinkite retweeted
I’m still running @COLDCARDwallet What else can people do? there is no peer. Update and roll your dice.
COLDCARD is a Bitcoin-only signing device. It does not require a COLDCARD account or mandatory companion app. Pair it with compatible wallet software and keep the signing key offline. coldcard.com/mk5
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Coinkite retweeted
COLDCARD now supports #Codex32 Shamir backups for existing BIP-39 and passphrase wallets. Choose your threshold. Same addresses. No coins moved. In 5.6.3 and 1.5.3Q. Save 10% when paying with Bitcoin. Learn more blog.coinkite.com/shamir-bac…
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