Research Area: EIP-7886 based Custom Gas Token

[tynes]

With EIP-7886, it becomes possible to charge for gas in any token using a smart builder because the coinbase address (sequencer) is charged for inclusion costs upfront.

Since the sequencer fee vault is hardcoded as the coinbase, it would mean that a certain amount of ether would need to be present in there to provide liquidity, as it would be deducted to pay for the entire gas of a block at the beginning of the block state transition function. The block builder can then include transactions that pay it in any currency and would just need to be smart enough to manage liquidity of ether so that it can continue to process blocks.

[zhiqiangxu]

If I'm understanding correctly, this design of CGT is purely on L2（the gas token is a L2 ERC20 token), so quite different from the previous design which is purely on L1(the gas token is a L1 ERC20 token), is it right?