BAC-L0-FOUND-109
Consensus families and finality
Proof of work, proof of stake, BFT: what each family buys, at what price, and what "finalised" means in each case.
- Level
- L0 — Foundation
- Duration
- 3 h
- Track
- Foundation
- Maintainer
- Developer Curriculum Architect
Learning objectives
- 01Compare probabilistic and deterministic finality
- 02Relate proposer selection to the security model
- 03Identify the reorganisation condition in each family
Guided lab
Observe a reorganisation on a probabilistic-finality test chain, then on a BFT chain.
Independent lab
Write a note comparing the security assumptions of three real protocols.
Security angle
51% attack, double-sign slashing, nothing-at-stake: three answers to the same question.
Assessment
Comparative note assessed on the rigour of the stated assumptions.