Not all blockchains carry the same security properties, and the wallet you choose to interact with one can either extend or undermine the protections the network provides. In this module, you'll compare the security models of public, private, and wallet-based blockchain architectures so you can evaluate which combination of design choices fits a given use case's risk profile.

Blockchain architectures generate a wide and varied set of security threats, and without a structured approach to finding them, it is easy to build mitigations for the risks you can see while missing the ones that will actually be exploited. In this module, you'll apply the STRIDE threat modeling framework to a blockchain use case, from mapping the attack surface through a data flow diagram to classifying threats by impact and probability and reverse-engineering documented crypto attacks for their mitigation logic.

The security controls you rely on do not protect a blockchain application on their own; you have to design, test, and verify them deliberately before anything reaches production. In this module, you'll implement the four core security layers of a production blockchain architecture: identity and access management, public key infrastructure, smart contract auditing, and penetration testing.

The frameworks and controls you have built across this course do not become useful until you can reach for them as a coherent whole, not as four separate checklists. In this module, you'll consolidate the security domains you've worked through into a unified architecture perspective and leave with a clear picture of where to take your practice next.