Protocol parameters

These are the parameters of the Sundial L2 protocol and ledger. For the node’s own settings, see Node configuration.

Consensus parameters

Parameter	Meaning
`event_wait_duration`	Wait added to the upper bound of an event-creating transaction’s validity interval to give an L1 event its inclusion time
`maturity_duration`	Minimum time a header waits in the state queue before merging. Also the challenge period of a resolution claim.
`registration_duration`	Wait before a registered operator can activate
`required_bond`	The operator bond in ADA. Equals `fraud_prover_reward` plus `slashing_penalty`.
`fraud_prover_reward`	Part of a forfeited bond paid to the fraud prover
`slashing_penalty`	Part of a forfeited bond paid to the settlement L1’s treasury
`inactivity_slashing_penalty`	Part of an operator’s bond slashed when it is retired for inactivity
`shift_duration`	Length of an operator’s shift
`max_inactivity_between_block_commitments`	Longest period without a block commitment before an operator can be struck
`user_events_negligence_timeout`	Longest period an operator can ignore a user event slated for its shift
`new_shift_inactivity_grace_period`	Grace period of a newly appointed operator
`max_inactivity_strikes`	Strikes after which an operator is partially slashed and retired
`max_validity_range_length`	Longest validity range of a scheduler advance, a state queue initialization or a block commitment
`max_tokens_allowed_in_deposits`	Most distinct tokens, ADA included, in a deposit
`escape_hatch_block_age`	Age of the last queued block beyond which the escape hatch can trigger
`escape_hatch_trigger_duration`	Longest validity range of a trigger transaction
`emergency_duration`	Length of the emergency period
`emergency_required_bond`	Bond that a registration must post during the emergency period
`emergency_grace_period`	Time after the emergency period in which reduced-bond operators can retire or top up
`emergency_retirement_penalty`	Part of an under-bonded operator’s bond claimed by whoever retires it after the grace period
`da_multisig_threshold`	Quorum threshold of the certified availability backing

Design ranges

For a network that secures value:

Parameter	Design range
`event_wait_duration`	2 to 4 minutes
`maturity_duration`	3 to 7 days
`registration_duration`	1 day
`required_bond`	50,000 to 200,000 ADA
`fraud_prover_reward`	30% to 50% of `required_bond`
`slashing_penalty`	50% to 70% of `required_bond`
`shift_duration`	1 hour

Constraints

These hold in every configuration:

required_bond = fraud_prover_reward + slashing_penalty.
emergency_required_bond is less than required_bond and greater than slashing_penalty, so that a slashed reduced-bond operator still leaves a reward for the prover.
escape_hatch_block_age exceeds max_inactivity_between_block_commitments plus new_shift_inactivity_grace_period, so that ordinary inactivity is handled by strikes before the escape hatch can open.
max_validity_range_length doesn’t exceed event_wait_duration, so that every event a block must include was already on L1 when the operator built the block.
maturity_duration is above 24 hours, twice the depth at which Cardano nodes reject forks.

Ledger parameters

Parameter	Value	Use
`min_fee_a`	44 lovelace per byte	Minimum fee. Same as Cardano’s `minFeeA`.
`min_fee_b`	155,381 lovelace	Minimum fee. Same as Cardano’s `minFeeB`.
`coins_per_utxo_byte`	The settlement L1’s value	Minimum UTXO value
Network ID	`1` when the node’s network is `Mainnet`, otherwise `0`	Separates the L2 ledger from the L1 and from other instances

The minimum fee of a transaction is min_fee_a × size + min_fee_b, where size is the byte size of its CBOR encoding.

Networks

Network	Settlement L1	Network ID	Genesis funds and faucet
`Preprod`	Cardano Preprod testnet	0	Seeded from genesis wallets. The faucet can be enabled.
`Preview`	Cardano Preview testnet	0	Seeded from genesis wallets
`Custom`	A local or emulated L1	0	Seeded from genesis wallets
`Mainnet`	Cardano mainnet	1	Not seeded. Faucet disabled.

The reference testnet settles on Preprod.

Node API

SDKs

Operator reference

Protocol reference

Consensus parameters

Design ranges

Constraints

Ledger parameters

Networks

​Consensus parameters

​Design ranges

​Constraints

​Ledger parameters

​Networks

Consensus parameters

Design ranges

Constraints

Ledger parameters

Networks