Learn how to use ckbunker with Coldcard HSM mode.

ckbunker is a program that you run on a computer attached to a Coldcard hardware wallet.

ckbunker will setup and operate the Coldcard HSM mode, where it signs without a human having to physically interact with the device.

The Coldcard implements a complex set of spending rules, called a policy - which cannot be changed once HSM mode is started.

ckbunker gives the end user immense flexibility to interact with Bitcoin safely and securely.


0:24 Setup Multi-Sig Policy
2:25 Sign Transaction
3:06 More Use Cases