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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| dip: 3 | ||
| title: Introduce EIP-1559-like Mechanism to Reform the Network Fee Market | ||
| authors: Darwinia Network | ||
| discussions-to: https://github.com/orgs/darwinia-network/discussions/1163 | ||
| status: Final | ||
| type: Economic | ||
| created: 2023-12-14 | ||
| --- | ||
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| # DIP-3 | ||
| ## Abstract | ||
| This DIP suggests implementing `EIP-1559`-like mechanism within the Darwinia Network to transform its fee structure. | ||
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| Under this proposal, all transaction fees would be burned, while tips would be awarded directly to block authors. | ||
| This aligns with our future inflation strategy, motivates collators, and paves the way for practical applications of *RING*. | ||
| The result is a more predictable, sustainable, and user-centric ecosystem. | ||
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| Before Darwinia adopts the new inflation model, this DIP will make minor adjustments to the inflation mechanism to prevent the reissuance of burned assets. | ||
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| ## Rationale | ||
| ### Reasons | ||
| 1. By adopting `EIP-1559`, which replaces the gas auction system with a base fee plus a priority fee, | ||
| users will benefit from more predictable transaction costs while also reducing network congestion during peak times. | ||
| This improvement serves both individual users and the network overall. | ||
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| ### Future Objectives | ||
| 1. To align with our upcoming inflation model, | ||
| the burning mechanism of `EIP-1559` for part of the transaction fees is consistent with Darwinia's strategy to revamp its inflation system. | ||
| This approach aims to maintain long-term token value stability and promote sustainable development of the network. | ||
| 2. To better balance responsibilities and rewards within the relay chain-parachain structure, where collators play a more indirect role in security, | ||
| it's logical to adjust block production incentives to reflect their updated contribution to consensus maintenance and network protection. | ||
| 3. To enhance utility for *RING*, introducing tangible use cases is essential. | ||
| Doing so encourages wider token engagement within network activities and increases their practical value. | ||
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| ### References | ||
| - https://eips.ethereum.org/EIPS/eip-1559 | ||
| - https://darwinia.network/Genepaper_v3.pdf | ||
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| ## Specification | ||
| ### Transaction Fee Adjustment | ||
| Integrate this within `DealWithFees` and pass the struct to `pallet-transaction` to enable the updated transaction fee model. | ||
| ```rs | ||
| impl pallet_transaction_payment::Config for Runtime { | ||
| type OnChargeTransaction = | ||
| pallet_transaction_payment::CurrencyAdapter<Balances, DealWithFees<Runtime>>; | ||
| .. | ||
| } | ||
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| /// EIP-1559 like configuration. | ||
| /// | ||
| /// Burn the base fee and allocate the tips to the block producer. | ||
| pub struct DealWithFees<R>(core::marker::PhantomData<R>); | ||
| impl<R> frame_support::traits::OnUnbalanced<pallet_balances::NegativeImbalance<R>> | ||
| for DealWithFees<R> | ||
| where | ||
| R: pallet_authorship::Config + pallet_balances::Config, | ||
| { | ||
| fn on_unbalanceds<B>( | ||
| mut fees_then_tips: impl Iterator<Item = pallet_balances::NegativeImbalance<R>>, | ||
| ) { | ||
| // substrate | ||
| use frame_support::traits::Currency; | ||
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| if fees_then_tips.next().is_some() { | ||
| if let Some(tips) = fees_then_tips.next() { | ||
| if let Some(author) = <pallet_authorship::Pallet<R>>::author() { | ||
| // Tip the block producer here. | ||
| <pallet_balances::Pallet<R>>::resolve_creating(&author, tips); | ||
| } | ||
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| // Burn the tips here. (IMPOSSIBLE CASE) | ||
| } | ||
| } | ||
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| // Burn the base fee here. | ||
| } | ||
| } | ||
| ``` | ||
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| ### Inflation Adjustment (Darwinia Only) | ||
| First, create the issuance map for Darwinia as outlined in the Darwinia Gene Paper. | ||
| ```rs | ||
| // Generate the issuing map. | ||
| // | ||
| // Formula: | ||
| // ``` | ||
| // unissued * (1 - (99 / 100) ^ sqrt(years)); | ||
| // ``` | ||
| // | ||
| // Use `I95F33` here, because `2^94 > TOTAL_SUPPLY * 10^18`. | ||
| fn issuing_map() -> Vec<Balance> { | ||
| let ninety_nine = I95F33::from_num(99_u8) / 100_i128; | ||
| let max = 10_000_000_000_u128; | ||
| let mut supply = 2_000_000_000_u128; | ||
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| (1_u8..=100) | ||
| .map(|years| { | ||
| let sqrt = transcendental::sqrt::<I95F33, I95F33>(years.into()).unwrap(); | ||
| let pow = transcendental::pow::<I95F33, I95F33>(ninety_nine, sqrt).unwrap(); | ||
| let ratio = I95F33::from_num(1_u8) - pow; | ||
| let unissued = max - supply; | ||
| let to_issue = | ||
| (I95F33::checked_from_num(unissued).unwrap() * ratio).floor().to_num::<Balance>(); | ||
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| supply += to_issue; | ||
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| to_issue * UNIT | ||
| }) | ||
| .collect() | ||
| } | ||
| ``` | ||
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| Calculate the session issuance amount based on the previously calculated map. | ||
| ```rs | ||
| /// Calculate the issuing of a period. | ||
| /// | ||
| /// Use `U94F34` here, because `2^94 > TOTAL_SUPPLY * 10^18`. | ||
| pub fn issuing_in_period(period: Moment, elapsed: Moment) -> Option<Balance> { | ||
| let years = (elapsed / MILLISECS_PER_YEAR) as usize; | ||
| let to_issue = ISSUING_MAP[years]; | ||
| let to_issue_per_millisecs = U94F34::checked_from_num(to_issue)? / MILLISECS_PER_YEAR; | ||
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| Some(to_issue_per_millisecs.checked_mul(U94F34::checked_from_num(period)?)?.floor().to_num()) | ||
| } | ||
| ``` | ||
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| ## Copyright | ||
| Copyright and related rights waived via [CC0](../LICENSE). |