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cip title author discussions-to status type category created license
64
New Transaction Type: Celo Dynamic Fee v2
Gastón Ponti (@gastonponti)
Final
Standards Track
Ring 0
2023-07-10
Apache 2.0

Simple Summary

Create a new EIP-2718 Transaction Type that will act as eip1559 transaction but including the feeCurrency field for paying in a different currency.

Abstract

This CIP proposes to create a new EIP-2718 Transaction Type 0x7b, which will have the same functionality as the CIP-42, but removing the gatewayFee and the gatewayFeeRecipient fields (already deprecated in the CIP-57). This new transaction is encoded as follows: 0x7b || rlp([chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, accessList, feeCurrency, signatureYParity, signatureR, signatureS])

Motivation

In the Espresso Hard Fork EIP-2718 was introduced. We also added a new transaction type 0x7c, which is the CeloDynamicFee transaction from EIP-1559, with the ability to be paid in a different currency. This transaction type was added as part of CIP-42.

In our pursuit to be closer to Ethereum and become an L2, we are deprecating the full node incentives (CIP-57), which will make the CIP-42 a transaction that will maintain two unused fields (the gatewayFee and gatewayFeeRecipient). This CIP aims to give a pruned alternative that eventually will allow us to deprecate CIP-42 transactions without losing any functionality and allow a smoother transition to L2.

Specification

Definitions

  • TransactionType 123 ⇒ 0x7b. See EIP-2718
  • || is the byte/byte-array concatenation operator
  • feeCurrency is the address of the whitelisted currency to be used to pay for gas

As of FORK_BLOCK_NUMBER, a new EIP-2718 transaction is introduced with TransactionType 123.

The EIP-2718 TransactionPayload for this transaction is 0x7b || rlp([chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, accessList, feeCurrency, signatureYParity, signatureR, signatureS]).

The signatureYParity, signatureR, signatureS elements of this transaction represent a secp256k1 signature over keccak256(0x7b || rlp([chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, accessList, feeCurrency])).

The EIP-2718 ReceiptPayload for this transaction is rlp([status, cumulativeGasUsed, logsBloom, logs]) before the L2 migration and rlp([status, cumulativeGasUsed, logsBloom, logs, baseFee]) afterwards. The baseFee field has been added to allow calculating the effectiveGasPrice field even after the block state has been pruned.

Rationale

The creation of this new transaction type will maintain functionality that we already have and will also allow us to prune our codebase in the L2 migration. That future migration will require to reduce differences to Ethereum as much as we can to reduce the complexity added for proof creations in either scenario (optimistic and zk), for example the future removal of the transaction added in the CIP-42 plus reverting the celo legacy transaction, to be exactly the same as the legacy in Ethereum. Also, it will give us the opportunity to prune our codebase and make it more maintainable.

Backwards Compatibility

As every new transaction type, this needs to be added as part of a fork, and as it is a new transaction type, it shouldn’t change any actual behaviour.

Implementation

An implementation suggestion is available at celo-org/celo-blockchain#2170

Security Considerations

This contains the same considerations as the CIP-42.

License

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