We’ve just seen a prototype of the Bitcoin hardware wallet that Jack Dorsey’s Block (the [company formerly known as Square](https://www.theverge.com/2021/12/1/22812752/square-changing-name-block-jack-dorsey-cash-app-tidal-crypto-spiral)) is working on, a device to help people “safely own and manage their Bitcoin,” [according to the company](https://wallet.build/how-the-wallet-works/). Block’s hardware lead, Jesse Dorogusker, tweeted an image showing several devices on Wednesday, all seemingly including fingerprint readers and USB-C charging ports — both things Block said its hardware wallet would include [in a blog post last month](https://wallet.build/march-update/).

Dorsey announced his company’s work on the crypto wallet in June 2021, and since then, we’ve gotten a few details on it. The company said the hardware wallet would be just one component in its crypto storage system and that it would have a corresponding mobile app for...