🛡️POA Consensus Model

In the PoA model, a fixed set of validators ,…,vn​} is authorized to propose and validate blocks.

Let:

𝑇 = Total number of validators

𝑞 = Quorum threshold

Δ = Network delay

𝐵𝑖 = Block proposed by validator 𝑣 𝑖

A block 𝐵𝑖 is finalized if:

$$i=1 ∑ T ​ 1 signed(B i ​ ) ​ ≥q$$

Where 1 signed ( 𝐵𝑖) = 1 if 𝑣𝑖 signed block 𝐵𝑖, and 0 otherwise.

Fast finality : Typically 𝑞=[2/3𝑇]

Block Time : BlockTime≈Δ+ϵ, where 𝜖 is the validator processing delay