BAC-L2-DOT-104Polkadot
Validators, nominators and NPoS
How nominated proof of stake distributes stake across validators, and why that distribution is an optimisation target rather than an accident.
- Level
- L2 — Appchain developer
- Duration
- 4 h
- Track
- Polkadot
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Describe an era's cycle: selection, reward, slashing
- 02Explain the goal of levelling stake across validators
- 03Compute a slash's effect on a validator and its nominators
Guided lab
Nominate on a test network, follow a full era and verify the reward computation.
Independent lab
Analyse a public network's stake distribution and identify its risk concentrations.
Security angle
Equivocation slashing: reproduce the conditions of an accidental double-sign in the lab.
Assessment
Stake-distribution analysis, marked on method rather than conclusion.