COLDCARD
@COLDCARDwallet
Followers
50,337
Following
21
Media
1,068
Statuses
14,735
Sleep at Night Technology! Ultra-secure Hardware Wallet for #Bitcoin The only dedicated air-gapped. Backup on SEEDPLATE f/ @Coinkite
Bitcoin
Joined December 2017
Don't wanna be here?
Send us removal request.
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Pinned Tweet
#COLDCARD
Q final tease before we start shipping🔥🔥🔥🔥🔥
Are you ready for this?
Volume up 🎧
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We are giving away lots of COLDCARD for
#Proofofkeys
randomly. No need to like or RT any of our posts.
Watch out. You could get a reply. 🎉
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Once you've set up your calculator and you're ready to give it a try, receiving
#Bitcoin
on your air-gapped COLDCARD with Sparrow Wallet will most likely be the next step. Be sure to bookmark this ⤵️
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🚨 BREAKING: BIDEN SIGNS EXEC ORDER TO END THE FED, REPORTEDLY
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Starting now, 15% off Mk4 with promo "noKYCwSE".
Security, privacy, air-gap, with the appropriate amount of tin foil hat.
Enjoy while it lasts!
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Don’t wait for your
#Bitcoin
HODL to 10x before getting your security right 🔐
Oftentimes, Number Go Up very fast.
Setup your COLDCARD, etch your SEEDPLATE, and test your backup!
Learn how on all these tutorial videos
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Starting today customer records will be blanked after 120 days of activity auto-magicaly🧙♂️ (i.e. since shipping)
It's a very big DB, we don't want to be marked as spammers so the email notification roll-out will take a couple weeks
Subject: Protecting Your Privacy: Data Blanked
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COLDCARD doesn't need a cloud PIN server.
Hardware wallets shouldn't need servers.
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Get 15% off COLDCARD with promo code FCKFTX for the next 24hrs, pay with bitcoin for an extra 5% off!
Get your
#Bitcoin
off exchanges. NOW.
Self Custody. No excuses.
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Unlike other wallets, COLDCARD purposely doesn't offer a desktop or mobile companion app, because you greatly increase security and privacy incentives by splitting this into two vendors.
We recommend the use of Electrum, Sparrow, Nunchuk and other clients.
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Everything has attack surface, nothing is infallible.
The reason so many sleep at night with COLDCARD is because we KISS 😘
Bitcoin only, extreme paranoid attention to detail, I/O simplicity with PSBT, no client software/app, clear cases, no bullshit…
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Tag a friend who has a Trezor or Ledger and we will randomly select 10 to receive a COLDCARD upgrade from us 🫡
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The Q1 is the higher-end COLDCARD that you've always dreamed about:
✅ full QWERTY keyboard
✅ larger LCD screen
✅ real QR scanner
✅ same security model as the Mk4 CC, with dual multi-vendor secure elements
Coming at the end of 2023:
Can't wait to get one!!
Coinkite Launches Its New Flagship Bitcoin Hardware Wallet Coldcard Q1 via
@namcios
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We’ve removed Litecoin on this last Upgrade. As much as it was a free feature (same signature), we’ve decided to only maintain Bitcoin.
Firmware 2.1.3 🍄⏫
"m/?/?/" to "m/_/_/", Some bkup files hit restore error [<6%] Existing files 'll read correctly now.P2SH-P2WPKH change outputs incorrectly flagged as fraudulent.Wanted redeem script, but should be witness script P2WSH change outputs
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Only one HWW in the market tells you where to shoot/drill 🫡
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COLDCARD Mk4 Firmware 5.2.0 release 🍄⏫
TL;DR: First
#bitcoin
Singing-Device to store MULTIPLE seeds 🎉. Switch between them effortlessly. Ideal for custodians (think Grandma's stash), devs, experiments, and secure key handling (e.g., TAPSIGNER backups).
- New:
#SeedVault
-…
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#Bitcoin
is over 1 Trillion. To commemorate, we will give away 3 COLDCARDs to the best boat accident memes. Post bellow.
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COLDCARD won't let you do this. It has fee size sanity checks!
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We were trying to add Ethereum to COLDCARD, but we couldn’t find out and self validate the current ETH supply.
Sticking to Bitcoin only ™
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We would like to introduce the new Self Custody Ad Campaign.
Unfortunately It didn’t get ready in time for the Super Bowl.
Proud of only hiring Canadian actors.
Check it out:
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The term 'crypto' is short for 'cryptography'
It's unfortunate that it has now become synonymous with scams
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Featuring a QWERTY keyboard for easier BIP-39 passphrase entry and with dedicated keys for:
💳 NFC
📡 QR scanning
🔦Flashlight button
🎛️ Menu selection
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Best Garry meme learning how to self custody with a COLDCARD wins a BLOCKCLOCK micro.
Go 👇
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Good morning!
Did you know COLDCARD created these 2 words as part of the login to prevent phishing.
What does this mean?
Well if someone attempts to replace your COLDCARD with a fake to steal your PIN.
You’d know! Because they would not know which words to display before…
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Announcing Coldcard 𝗠𝗸𝟯🔒
✅Next gen Secure Element 608A
✅SE set brick after 13 failed PINs
✅New MCU +memory for complex txns & things like CT
✅Hardened against side-channel attacks (Common-mode chokes, ferrite beads, pwr sup bypassing
✅Epoxy on SE
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Quick reminder that for your safety and privacy we blank customer webstore data after 120 days.
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Presenting the all-new Glow-In-The-Dark Mk4, specially created to radiate in the depths of darkness of your coldest caverns of storage. Make your reservation now:
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Feature. Not a bug.
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Coldcard 3.2.1 Firmware Release 🍄⏫
-Major Multisig Improvements! Now tracks derivation path for each co-signer;Blocks multiple instances of same XFP;Show Ypub/Zpub...
-
#Payjoin
PSBT BIP78
- And many-many more things, a literal wall of text.
-Learn more
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Coinkite store deletes your personal identifiable information after 120 days.
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In device Address Explorer is coming to
@COLDCARDwallet
sooner thanks to
@hodlwave
! PR just waiting for review.
You hear it right, you can check all the addresses fully cold in the comfort of your heardware wallet and never trust the computer or phone wallet 🔥🔥🔥
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COLDCARD 4.0.0 Firmware Release🍄⏫
-Bitcoin Core’s “libsecp256k1”+Optmzd SHA256
-Pure-assembly AES256-CTR (faster USB)
-24th-Word Calculated
-Secure Cloning/Migrating
-Deterministic/Reproducible builds
-HSM/CKBunker Updates
-Much more (ie rnd 7z name)
-
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Pumped to announce our new COLDCARD tutorial videos!
We've commissioned the amazing
@KISBitcoin
to create them.
The videos will be rolled out as they are created. Here are the first 3:
1. Setup COLDCARD Nickname
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Need more warehouse ppl!
Nothing like having inventory, but not able to pack fast enough for unexpected demand spike. 💅
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On this day in 2017, Bitcoiners ended the Blocksize War✌️
By successfully deploying a software upgrade through a user-activated soft fork
#UASF
, they made it clear that users (ie nodes) control the rules of the Bitcoin network—not miners or companies
Visit…
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Gary should use a COLDCARD and self custody
#bitcoin
instead of tweeting about ETFs all day.
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10,000,000 sats for the first one who figures out how SIM swap a COLDCARD PIN login as designed.
@bob_unlimited11
not good enough. You probably need multisig. and to understand opsec risks. You need protection against sim swapping.
Its not that simple, especially with large amounts.
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Say hello to the Mk4 HARDCASE - a branding-free, water-resistant case with a sleek black design and custom foam inserts for your calculator.
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Bitcoiners are simple people
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Do you work in Canadian independent media?
If you need a hardware wallet we are setting some COLDCARD aside for free.
We can’t guarantee that we will have enough, but we will try.
Email support at coinkite dot com
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COLDCARD doesn’t need to phone home for its security, no hardware wallet should phone home.
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There is no need to contact us about data deletion anymore. This will be automated going forward.
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COLDCARD is the right kind of security, for the appropriate level of paranoia.
#Bitcoin
is too precious.
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We are humble ECC Calculator makers dear leader Brandeu, all praise your infinite wisdom.
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Next level USB P.P.E. Tin-Foil Mode is here.
Checkout
#COLDPOWER
our new Power-only (NO DATA) USB Adapter for your
@OPENDIME
or
@COLDCARDwallet
.
Uses standard 9-volt battery!
Pre-order now
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Happy birthday, Bitcoin! Today marks the official anniversary of the mining of the Genesis Block, the very first block on the blockchain 🎂
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Permanently disable NFC on your COLDCARD by scraping the little gold trace shown here ⤵️
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📣Coinkite only holds 6 months of support tickets, which are deleted automatically. It doesn't require KYC for support
Our store only holds 120 days of customer data, which is also anonymized/purged automatically. You can also buy under nym, pay with bitcoin and ship to a POBOX
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Quick reminder that we can delete any information on your request. Just email support
@coinkite
.com, to expedite send with subject DATA DELETION and include you last invoice ID on the subject.
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Dear Customers,
Thanks for ransacking our inventory this last month, and obliterating the 7 days.
We have cranked up production and are getting orders out, even with the CV locks downs.
Love,
Coinkite Team.
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With USB-C providing 100mA at 5 volts and 3 AAA batteries available as alternatives, the Q1 offers flexibility and convenience in powering options. It can be used in either air-gapped or wireless modes to meet your specific needs. The power wire can also be removed.
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Early-bird discount now available on reservations:
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Bitcoin Security Guide - A simple and secure setup for your Bitcoin Self Custody
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Firmware Upgrade 3.1.8🍄⏫
-SPEEDier Input⚡️
-No Shitcoins Added™
-New Setting: Delete PSBTs
-Current XFP fingerprint on "Ready To Sign"
-File names f/ SD Card now sorted
-Can now show SHA256 for SD files
-BIP85 support on Mk2♥️
-PSBT improved error msgs
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anyone else would like to see this happen?
@COLDCARDwallet
need a default “boot to calculator mode” with a full function add/sub/mult/div… obfuscation isn’t security, but it would add utility while HODL
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Easily drag and drop PSBT files for signing by emulating a 4MB USB stick on your phone using your COLDCARD. Just connect them together using a cable adapter and go to Settings > Hardware On/Off > Virtual Disk
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#COLDCARD
Firmware 5.1.3 released 🍄⏫
- New Feature: Batch sign multiple PSBT files. Advanced/Tools -> File Management -> Batch Sign PSBT
- Enhancement:
@SparrowWallet
dded as an individual export option (same file contents)
- Enhancement: change key origin information export…
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#Coldcard
Firmware v2.1 is out! ☢️🦡🥳🎉
✅ PSBT Multisig! Export/import for Air-gapped creation
✅
@WasabiWallet
Skeleton & Air-gapped
✅ Endian change on XFP presentation
✅
@ElectrumWallet
PSBT Multisig support (PR)
✅ public.txt xpub export improved
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A visual aid on the MK4 helps you find exactly where to drill/shoot your calculator for permanent disposal
#ShootThese
@COLDCARDwallet
I have a bricked coldcard. Funds moved and all fine. Is there a proper way to destroy this thing?
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The QR scanner on the Q1 is equipped with bright LED lights to enhance scanning performance in any lighting conditions. The data is decoded by the dedicated module using a simple and secure 2-wire serial port connection, minimizing the risk of malicious data infiltration.
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Did you know
@Coinkite
is an independent company?
Self funded old school business helping people secure bitcoin for over 10 yrs!
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Did you know that you can run a COLDCARD simulator on your desktop?
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