# Based Rollup: A New Frontier in Ethereum Expansion

Based Rollup is opening new possibilities for Ethereum (ETH) expansion. This approach is gaining attention as it preserves network effects while maintaining composability, which allows smart contracts and protocols developed in different environments to interact and build on each other.

According to a report by TAIKO’s Yunger, Based Rollup is still in its definition stage, with the most basic approach being ‘total anarchy.’ This method, mentioned by Vitalik Buterin, is the first rollup adopted by TAIKO. However, it comes with trade-offs, including inefficiencies due to parallel block proposals.

Currently, TAIKO’s model lacks safeguards against failed block proposals by proposers. To address this, revert protection from L1 needs to be implemented. Revert protection prevents proposers from being frontrun by rejecting multiple proposeBlock calls.

Nevertheless, the total anarchy approach has additional issues. Without a predefined next proposer, no pre-confirmation can be generated. This impacts interoperability and interaction frequency with L1.

# Approaches to Resolve Network Issues

## Auction Method

This method selects the next proposer through an on-chain auction. Once a winner is announced, they can build L2 blocks and propose them to L1. While this is effective for selecting L2 proposers, it has little impact on composability with L1. Enhanced connectivity with L1 requires L1 validators to delegate building rights to the auction winner.

## Opt-In L1 Proposer

In this approach, L1 proposers selectively participate in Based Rollup through a gateway. L1 proposers can build L1 and L2 blocks simultaneously, achieving atomic composability. Proposers must deposit collateral in the gateway, which is burned if they fail to include user transactions in the block.

# Spectrum of Based Rollup

### Current Version: Based Rollup

In TAIKO’s current version, L2 blocks are built locally, and anyone can propose them to L1. Composability depends on L2 block time, which varies based on the time needed to accumulate L2 fees to cover L1 costs. Atomic composability is not present.

### ‘Highly Based’ Rollup

In this approach, all L2 transactions and blocks are sequenced and built on L1. This offers no logical or technical scalability advantages and remains a theoretical concept.

### Based Rollup with Opt-In L1 Proposer

L1 proposers participate through a gateway, offering full composability and pre-confirmation between L1 and L2. This represents the future of Based Rollup and is slated for implementation in TAIKO’s next version. However, limited proposer participation could reduce composability and vitality.

The different approaches to Based Rollup vary in composability and user experience. Higher composability, based on the L1 block time (around 12 seconds), enhances synchronization between L1 and L2. Lower composability increases L2’s independence and loosens its connection with L1.

Based Rollup is evolving to expand Ethereum’s potential while maintaining network interoperability.