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cip title author discussions-to status type category created requires license
42
Modification to EIP-1559
Joshua Gutow <@trianglesphere>
Final
Standards Track
Ring 0
2021-08-11
EIP-2718 Typed Transaction Envelopes - https://eips.ethereum.org/EIPS/eip-2718
Apache 2.0

This specifies modifications to EIP-1559 for Celo.

Simple Summary

Users pay basefee + tip with the tip going to the validator and basefee to the community fund (governance proxy) instead of paying gas_price with basefee going to the community fund and gas_price - basefee going to validators.

Abstract

This CIP specifies how EIP-1559 should be modified and implemented on Celo. In particular, the gas price minimum (also known as the basefee) should be kept the same, but the gas price should be split into max_priority_fee_per_gas and max_fee_per_gas and the effective gas price should be paid as specified in EIP-1559.

Motivation

Celo implemented part of EIP-1559 at launch. The implementation sets a gas price minimum through smart contract logic, but continues to keep a single gas price field. Thus transactions on Celo behave like legacy Ethereum transactions post London. Implementing the basefee and tip system will enable users to more reliably include their transactions at a lower and more predictable price.

Specification

EIP-1559 should be implemented on Celo with the following modifications:

  1. The block header shall not be modified
  2. The base_fee_per_gas shall be calculated by calling getGasPriceMinimum to the GasPriceMinimum smart contract.
  3. The basefee or gas_price_minimum shall be paid to the community fund (governance proxy contract) if it exists or refunded to the sender if not.
  4. There shall be a typed transaction with the code 0x7c that has the following format: 0x7c || rlp([chain_id, nonce, max_priority_fee_per_gas, max_fee_per_gas, gas_limit, feecurrency, gatewayfeerecipient, gatewayfee, destination, amount, data, access_list, signature_y_parity, signature_r, signature_s]). This will be in addition to the type 0x02 transaction as specified in EIP-1559.

Rationale

This brings only the portions of EIP-1559 that have not been implemented to Celo. This is required to continue to maintain compatibility with Ethereum.

Backwards Compatibility

Legacy transactions will continue to work and will still be included in blocks.

EIP-1559 compatibility issues also apply with the exception that the Celo block header is not changing. One EVM modification is that the GASPRICE opcode will now refer to the effective_gas_price (basefee+tip) not the amount paid to the validator.

Test Cases

TODO

Implementation

EIP-1559 has been fully implemented in go-ethereum. On Celo the basefee is already set via the gas price minimum contract, however this CIP has not yet been implemented.

Security Considerations

This contains the same set of security considerations as EIP-1559. One additional consideration is that this CIP reduces the amount of fees paid to the validators.

License

This work is licensed under the Apache License, Version 2.0.