We’ve stopped all sales and are processing full refunds for any orders placed last week or later.
All clients were notified about the bug this Saturday.
Please note: we have never sold MK3 or earlier devices.
ColdHodl
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First official Coldcard reseller in Europe
If you generated the seed using an Mk3 on version 4.0.1 (March 2021) or any subsequent version URGENT ACTION IS REQUIRED!
Seeds generated on Mk4, Q and Mk5 before the fixed firmware releases are also affected. UPDATE AND SEED REGENERATION IS REQUIRED!
COLDCARD Documentation
Upgrade Firmware
Download, verify, install, and confirm current COLDCARD firmware.
Important security advisory regarding older Mk3 units.
Note for COLDHODL customers: We have never sold the Mk3 or any earlier models.
COINKITE Blog
Coldcard Security Advisory
Funds from affected COLDCARD seeds are at risk if the seed lacks 50 independent, private dice rolls and the wallet lacks a strong, unique BIP-39 pa...
No customs. No import duty. Just an air-gapped sovereignty, delivered straight to your European doorstep. 🔒🇪🇺
coldhodl.com
The Ultimate Flex: Carrying your entire generational wealth across an international border inside your head using 12 memorized words.
Generational wealth used to be built on land and factories; now it’s built on keeping a piece of paper out of the laundry.
Address hijacking is a real threat on compromised PCs.
COLDCARD lets you verify bitcoin addresses directly on the device display. Zero middleman risk.
Get yours in Europe: https://coldhodl.com/
You don't need a 50-step trading strategy; you just need patience and cold storage.
No keys, no coins. Simple.
Get your COLDCARD shipped fast within Europe - no customs, no friction. 🇪🇺
Visit coldhodl.com today! 🔒
If you can reset your password via email, you don't own the asset - you’re just borrowing permission.
Fast delivery anywhere in Europe 🇪🇺
Get your official hardware wallet without the hassle of overseas shipping: https://coldhodl.com/
Early Bitcoin had a hidden "panic button".
Satoshi built an Alert Key that could remotely force all Bitcoin nodes worldwide into "Safe Mode." If a major bug hit, the key could freeze wallet transactions network-wide to protect funds.
It was permanently deleted in 2016.
Most people think there will be exactly 21 million bitcoin. But because the code rounds down fractions of a satoshi during halvings, the true maximum supply is: 20,999,999.9769 BTC.
So the shortfall from 21 million is:
0.0231 BTC = 2,310,000 satoshis
Did you know? COLDCARD's translucent case isn't just for looks. It lets you visually inspect the circuit board to ensure hackers didn't physically tamper with the device during shipping.
The ultimate gift for your future self? Peace of mind.
Secure your bitcoin offline with a @COLDCARDwallet hardware today: coldhodl.com
A hardware wallet doesn't store Bitcoin; it isolates your private keys from the internet. The actual funds live on the Bitcoin network, secured by thousands of nodes worldwide.
You didn't just buy the hardest money in human history just to let a random European fintech startup hold your private keys.🤦
If your crypto wallet supports 4,000 different coins, that’s not a secure vault - that’s a portable casino terminal. 🎰
“Government is the only institution that can take a valuable commodity like paper, and make it worthless by applying ink.”
Ludwig von Mises
🇪🇺 European HODLers: Stop waiting weeks for overseas shipping and dodging unpredictable import duties. Get your COLDCARD shipped directly from within the EU.
Premium security, zero customs friction. Fast, secure, local: coldhodl.com
