Advisory Groups

This page is written on behalf of the Parameters Committee, the information contained is subject to change and amendment by the committee chairs at any time and should be used at your own risk

The Parameter Committee has grouped the protocol parameter changes by type, allowing different thresholds to be set for each group.

We are not, however, restricting each protocol parameter governance action to be contained within one group. In case where a governance action carries updates for multiple parameters from different groups, the maximum threshold of all the groups involved will apply to any given such governance action.

The network, economic and technical parameter groups collect existing protocol parameters that were introduced during the Shelley, Alonzo and Babbage eras. In addition, we introduce a new governance group that is specific to the new governance parameters that will be introduced by CIP-1694.

The network group:

• maximum block body size (maxBBSize)

• maximum transaction size (maxTxSize)

• maximum block header size (maxBHSize)

• maximum size of a serialized asset value (maxValSize)

• maximum script execution units in a single transaction (maxTxExUnits)

• maximum script execution units in a single block (maxBlockExUnits)

• maximum number of collateral inputs (maxCollateralInputs)

Economic group:

• minimum fee coefficient (minFeeA)

• minimum fee constant (minFeeB)

• delegation key Lovelace deposit (keyDeposit)

• pool registration Lovelace deposit (poolDeposit)

• monetary expansion (rho)

• treasury expansion (tau)

• minimum fixed rewards cut for pools (minPoolCost)

• minimum Lovelace deposit per byte of serialized UTxO (coinsPerUTxOByte)

• prices of Plutus execution units (prices)

The technical group:

• pool pledge influence (a0)

• pool retirement maximum epoch (eMax)

• desired number of pools (nOpt)

• Plutus execution cost models (costModels)

• proportion of collateral needed for scripts (collateralPercentage)

The governance group:

• governance voting thresholds ($P1$, $P{2a}$, $P{2b}$, $P3$, $P4$, $P{5a}$, $P{5b}$, $P{5c}$, $P{5d}$, $P6$, $Q1$, $Q{2a}$, $Q{2b}$, $Q4$)

• governance action maximum lifetime in epochs (govActionLifetime)

• governance action deposit (govActionDeposit)

• DRep deposit amount (drepDeposit)

• DRep activity period in epochs (drepActivity)

• minimal constitutional committee size (ccMinSize)

• maximum term length (in epochs) for the constitutional committee members (ccMaxTermLength)