Think in threat models, not tips: famous hacks dissected, a 15-minute audit checklist, SIM-swap and address-poisoning defense labs, multisig safe setup, an

Course Information

Course Instructor

The W3D Team Author

Independent research on blockchain decentralization. Scores and methodology are maintained by the W3D Team.

1 · Core Lessons (CC-BY)

Famous Hacks: DAO, Ronin, Poly Network

Objective: internalize the three hack archetypes that keep repeating — so you recognize the next one wearing new clothes.

Audit Checklist for Beginners

Objective: run a 15-minute safety check on any protocol before depositing — the same screen professionals run first.

Lab: SIM-Swap Defense

Objective: close the two non-crypto attack paths that drain the most real users: phone-number takeover and history poisoning.

Lab: Multisig Safe Setup

Objective: build a 2-of-3 multisig on testnet that survives losing any single key — the professional standard for serious holdings.

Recovery Without a Seed

Objective: understand every non-seed recovery path honestly — what saves you, what exposes you, and what’s marketing.