Coinkite

Bitcoiners have been waiting for this. Our #BitcoinBlackFriday sale is LIVE 🔥 🔸 25% off when paying with BTC 🔸 20% off when paying with fiat 🔸 $50 off BLOCKCLOCK Mini While supplies last.

#COLDCARD Firmware Release 1.3.4Q & 5.4.4Mk4 🍄⏫ Read the complete release and upgrade here 📁

COINKITE Blog

COLDCARD Bitcoin Spending Policy Released

New COLDCARD Feature Release: Spending Policies!

🔐 Single-Sig Spending Policies & 📱2FA! You can now reconfigure your existing COLDCARD with a policy📑, so it will refuse to sign transactions that are too large, too frequent, or sent to an address not on your whitelist We have also found a way to support **2FA authentication** using the usual phone apps (RFC 6238). If that's enabled, you will not be able to spend using your #COLDCARD unless you also have your phone and provide the correct #GoogleAuthenticator 6-digit numeric code. Added file rename, Explorer is now offered for transactions of all sizes, NFC improvement, Added @BullBitcoin_, and many other fixes and improvements! Watch the full video ▶️

The REEEE-Coupling SALE is on! Something we don’t understand is happening with MaCrO and #Bitcoin weak hands are selling. So we are giving 20% OFF all of our products to help you #HODL for them. 🥬🙌

Coinkite Store – Get your Coinkite, Opendime and Coldcard product here!

Coinkite Store – Get your Coinkite, Opendime and Coldcard product here!

Get your Coinkite, Opendime and Coldcard product here!

Did you know #COLDCARD Q has a unique feature to store Secure Notes? This feature allows you to add/manage new notes encrypted by your coldcard master secret. Store those very important pieces of information and back it up with your Secure MicroSD Backup Import and Export even by QR! 🪄 Learn more

COLDCARD Documentation

Secure Notes & Passwords

Documentation, tutorials, and other resources for COLDCARD, the world

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Happy to announce the new @Spiral #HereComesBitcoin collaboration. All profits from this Grumpy Surfer #SATSCARD sales will be donated to #Bitcoin Education.

Coinkite Store – Get your Coinkite, Opendime and Coldcard product here!

SATSCARD™ HCB - Summer of Bitcoin

This is a collaboration with Spiral.xyz

Good morning! Did you know COLDCARD invented an easy and safe way to help prevent evil-maid and tampering attacks? We call it anti-phishing words, learn more here.

#COLDCARD Firmware Upgrade! ## SeedXOR 🌳XOR from Seed Vault (select other parts of the XOR from seeds in the vault). Restore geographically distributed SeedXOR without physically bringing the parts together 📸Seed XOR seeds can be scanned f/ SeedQR instead of typing them by hand ## Multisig 🔐Option for unsorted multisig [multi(…)] 📝JSON wrapped imports to provide custom `name` instead of the filename. Most useful for USB and NFC imports which have no filename 🔬Descriptor checksum is no longer required upon import ⛓️‍💥Create Airgapped (aka using CC as multisig coordinator) now works with BBQRs ## QR File Share 📁Same as NFC file share, allows user to share any file from SD card via QR/BBQr ## Optimizations and speed 🍄 #libsecp256k1 bumped to latest 0.5.0 (point multiplication algorithm speed up, etc) 🐇⚡️improvements in our signature grinding algo. Updated libsecp plus our optimizations yield 30% improvement in signing speed over previous version (15% in overall signing speed as signing is not the only part of it (validation, change checks, etc.)) ## Security 🧐Improve side-channel protection: libsecp256k1 context randomization now happens before each signing session And much more! Details here

COINKITE Blog

Performance and Fixes

New COLDCARD Release: Versions 5.4.0 (Mk4) and 1.3.0 (Q)

Tapscript is happening