Stay safe out there.

If you use a Coldcard, review these findings from our Engineering and Security teams to see whether you may be affected.

Block Engineering Blog

Predictable RNG Fallback and 32-Bit Reseed in COLDCARD Firmware

How a disabled hardware-RNG path and 32-bit reseed constrain entropy in affected COLDCARD firmware and expose generated secrets.

Turns out most people use a bitcoin wallet the same way they'd use any wallet: To hold their own money and spend it on their own terms. Our new report with Global Digital Finance and Block, in partnership with TRM Labs and Coinbase, shows this in the data — and it's why we're building Bitkey for you: True ownership of your money, no middleman holding your keys. Report link below ↓

This is about as cheap as buying bitcoin gets. Pick @Cash App in Bitkey and you'll pay zero trading fees and zero spread, so more of your money turns into sats.

Meet the new Bitkey. No seed phrase. Multisig by default. Built-in inheritance. And now, with 100% more screen. See what's new:

Bitkey

Meet the new Bitkey

Today we're introducing a new Bitkey.