darkfi/doc/src/spec/contract/dao/model.md

Model

Let $\t{Bulla}$ be defined as in the section Bulla Commitments.

Let $ℙₚ, 𝔽ₚ, \mathcal{X}, \mathcal{Y}, \t{𝔹⁶⁴2𝔽ₚ}$ be defined as in the section Pallas and Vesta.

DAO

The DAO contains the main parameters that define DAO operation:

• The proposer limit $L$ is the minimum number of governance tokens of type $τ$ required to create a valid proposal on chain. Note this minimum can come from multiple token holders.
• Quorum $Q$ specifies the absolute minimum number of tokens required for before a proposal can be accepted.
• The approval ratio $A^\%$ is a tuple that specifies the minimum theshold of affirmative yes votes for a proposal to become accepted.
• The public key $PK$ serves a dual role for both encrypted notes, and as a key to authorize accepted proposals to be executed. This key may be shared widely with all DAO members or within a privileged group.

Define the DAO params $$ \begin{aligned} \t{Params}\t{DAO}.L &∈ ℕ₆₄ \ \t{Params}\t{DAO}.Q &∈ ℕ₆₄ \ \t{Params}\t{DAO}.A^\% &∈ ℕ₆₄ × ℕ₆₄ \ \t{Params}\t{DAO}.τ &∈ 𝔽ₚ \ \t{Params}_\t{DAO}.\t{PK} &∈ ℙₚ \end{aligned} $$ where the approval ratio $\t{Approval}^\% = (q, d)$ defines the equivalence class $[\frac{q}{d}]$ of fractions defined by $q₁d₂ = q₂d₁ ⟺ [\frac{q₁}{d₁}] ~ [\frac{q₂}{d₂}]$.

{{#include ../../../../../src/contract/dao/src/model.rs:dao}}

$$ \t{Bulla}\t{DAO} : \t{Params}\t{DAO} × 𝔽ₚ → 𝔽ₚ $$ $$ \t{Bulla}\t{DAO}(p, b\t{DAO}) = \t{Bulla}(ℕ₆₄2𝔽ₚ(p.L), ℕ₆₄2𝔽ₚ(p.Q), ℕ₆₄2𝔽ₚ(p.A^\%), p.τ, \mathcal{X}(p.\t{PK}), \mathcal{Y}(p.\t{PK}), b_\t{DAO}) $$

Proposals

Auth Calls

Let $\t{FuncId}$ be defined as in Function IDs.

Let $\t{BLAKE2b}$ be defined as in BLAKE2b Hash Function.

Define $\t{AuthCall} = (\t{FuncId}, 𝔹^*)$. Each authorization call represents a child call made by the DAO. The auth data field is used by the child invoked contract to enforce additional invariants.

{{#include ../../../../../src/contract/dao/src/model.rs:dao-auth-call}}

Define $\t{Commit}\t{Auth} : \t{AuthCall}^* → 𝔽ₚ$ by $$ \t{Commit}{\t{Auth}^*}(c) = 𝔹⁶⁴2𝔽ₚ(\t{BLAKE2b}₆₄(\t{Encode}(c))) $$ which commits to a Vec<DaoAuthCall>.

Proposal

Define the proposal params $$ \begin{aligned} \t{Params}\t{Proposal}.C &∈ \t{AuthCall}^* \ \t{Params}\t{Proposal}.t₀ &∈ ℕ₆₄ \ \t{Params}\t{Proposal}.D &∈ ℕ₆₄ \ \t{Params}\t{Proposal}.φ &∈ 𝔽ₚ \ \t{Params}\t{Proposal}.\t{DAO} &∈ \t{Bulla}(\t{DAO2𝔽ₚ}(\t{Params}\t{DAO})) \ \end{aligned} $$

{{#include ../../../../../src/contract/dao/src/model.rs:dao-proposal}}

$$ \t{Bulla}\t{Proposal} : \t{Params}\t{Proposal} → 𝔽ₚ⁵ $$ $$ \t{Bulla}\t{Proposal}(p) = (\t{Commit}{\t{Auth}^*}(p.C), ℕ₆₄2𝔽ₚ(p.t₀), ℕ₆₄2𝔽ₚ(p.D), p.φ, p.\t{DAO}) $$

Vote Nullifiers

Additionally for proposals, we keep track of nullifiers for each token weighted vote for or against a proposal.

Let $\t{PoseidonHash}$ be defined as in the section PoseidonHash Function.

Let $\mathcal{C}$ be the coin params, and $C$ be the coin commitment as defined in Money Contract.

Let $P$ be a proposal bulla as in the section Proposal.

Define $\t{Nullifier}\t{Vote} : 𝔽ₚ × 𝔽ₚ × 𝔽ₚ → 𝔽ₚ$ as follows: $$ \t{Nullifier}\t{Vote}(\mathcal{C}.s, C, P) = \t{PoseidonHash}(\mathcal{C}.s, C, P) $$

Blockwindow

Time limits on proposals are expressed in 4 hour windows. Since proofs cannot guarantee which block they get into, we therefore must modulo the block height a certain number which we use in the proofs.

{{#include ../../../../../src/contract/dao/src/lib.rs:dao-blockwindow}}

which can be used like this

{{#include ../../../../../src/contract/dao/src/entrypoint/propose.rs:dao-blockwindow-example-usage}}