Curriculum·J306 Smart Contract Risk for Non-Developers·96 min
The rug taxonomy
By the end of this lesson you can
- →Classify an exit scam by the mechanism that executes it, not by the story around it
- →Map which categories the J306-01 and J306-02 checks catch, and which they miss
- →Compute the base rate you are drawing from when evaluating new tokens
- →Treat a liquidity lock expiry as a dated deadline rather than as a safety property
Junior · account required
This lesson opens with The base rate, measured.
Orientation and Freshman are open to everyone, no account needed. From Sophomore onward we ask you to sign in, because progress through the later levels only means anything if it is tracked against a record.
It is free. We do not sell the list and there is nothing to buy at the end of it.
Sources and review
- https://www.coindesk.com/markets/2021/12/17/defi-rug-pull-scams-pulled-in-28b-this-year-chainalysis
- https://coincodex.com/article/13190/users-lost-77-billion-to-crypto-scams-in-2021-according-to-chainalysis-report
- https://deepstrike.io/blog/rug-pull-statistics
- https://www.thecoinrepublic.com/2025/01/01/how-squid-games-success-led-to-one-of-biggest-rug-pulls-in-2021/
Confidence medium·Volatility medium·Reviewed 2026-08-06·Owner unassigned
Contested
Marked medium confidence because scam classification methodology varies between analysts and between years, and the two figures used here come from different reports covering different periods. The derived total of about 2.06 million launches follows arithmetically from the reported 74,037 and 3.59 percent and is presented as such.
J308-02 owns governance as an attack surface, including vote buying, delegation concentration and treasury capture. This lesson names the governance rug as a category and defers the mechanics. Keep the split.