Security that ignores human behavior isn’t security.
Design matters.
Bitkey
What does “safety” actually mean in bitcoin self-custody?
Bitkey Product Lead Jonathan Pollack explains why security alone isn’t enough — and how usability and privacy are just as critical to keeping your bitcoin safe.
Full conversation with Simply Bitcoin: https://t.co/49JDjp7NQm
Chain Code Delegation has now been assigned BIP 89 — a big step forward for private collaborative custody in bitcoin.
With privacy fully rolled out in the Bitkey app, customers who update now benefit from the first implementation of this emerging standard.
A big moment for the ecosystem — and for self-custody.
GitHub
BIP 89: Chain Code Delegation for Private Collaborative Custody by jurvis · Pull Request #2004 · bitcoin/bips
We propose a new BIP for Chain Code Delegation, a collaborative custody technique that involves privileged participants (delegatee) withholding BIP...
Bitkey now has another top-tier buy partner.
US customers can now buy bitcoin with Strike and move it straight into your Bitkey wallet in one smooth flow.
Another step toward seamless bitcoin experiences.
You can now buy a Bitkey without giving up your home address.
Ship to thousands of pickup points across the U.S. — FedEx, Walgreens, Kroger, Dollar General, and more.
Pay with bitcoin, pick up privately, and stay in control.
Bitkey: Self-custody bitcoin wallet
Learn about Bitkey privacy in Bitkey Basics
We’re wrapping up 2025 with 0% fees on bitcoin buys when you pick Cash App in Bitkey — now through the end of the year.
The banks might be holidazed (how many are we at now?) but bitcoin never rests. Happy stacking.
Terms apply: 
Bitkey x Cash App: 0%-Fee Bitcoin Buys
A bitcoin wallet to own your private keys. Bitkey includes an app, hardware wallet, and recovery tools in case you lose your phone, or hardware, or...
With Chain Code Delegation, Bitkey is the first multi-sig wallet that gives you recovery and security without giving up your privacy.
By implementing Chain Code Delegation, Bitkey becomes the first private collaborative multisig wallet — what you do with your keys is your business, simplifying self-custody is ours.
Not our keys. Not our business.
Not our keys. Not our business.
Bitkey: Self-custody bitcoin wallet
Not our keys, not our business
How Bitkey used Chain Code Delegation to create the first private collaborative bitcoin wallet.
Starting today, Bitkey users can enjoy the safety ...
Across the Block ecosystem, brands like Cash App, Square, Spiral, Proto, and Bitkey are helping make bitcoin more open, accessible, and usable.
From payments and mining to self-custody and education, we’re proud to be part of a global network building financial freedom for everyone. 🌍
Watch Ivy Galindo's story and see how bitcoin is changing lives: 
Bitcoin
Bitcoin
Discover how Block advances bitcoin—Cash App and Square payments, Bitkey self-custody, and Proto mining—expanding access for millions worldwide