The market has been discussing the innovative L1-Sequenced sorting method known as Based Rollup for a long time. Recently, Puffer Finance has built a UniFi layer2 solution based on Based Rollup + native AVS verification system. What are your thoughts on this? Next, let me share my understanding:
1) Based Rollup essentially outsources the "sorting" function to the L1 mainnet, where the L1 Proposer directly packages the transactions submitted by Based Rollup when constructing blocks. This can solve the centralization problem of Sequencers that layer2 has been criticized for.
However, the issue is that Based Rollup can only perform sorting and cannot directly intervene in the off-chain consensus consistency of layer2. Simply put, if N Based Rollup layer2s emerge, everyone has a peer-to-peer relationship with the Ethereum mainnet, and if they are disconnected from Ethereum's single connection, achieving interoperability among these layer2s becomes quite unlikely.
Therefore, the idea behind the UniFi solution is to introduce AVS decentralized verification services, which provide "verification" services for transactions submitted to the mainnet beyond just "sorting."
AVS (Active Verification Service) is a verification service that relies on L1 verification nodes to provide additional security consensus. The Eigenlayer protocol has facilitated many AVS application scenarios, including Oracles, decentralized Sequencers, MEV, intent transactions, etc., essentially performing pre-confirmation preprocessing work.
The difference is that, like Eigenlayer, Puffer is also a node verification infrastructure within the Ethereum ecosystem, and Puffer can directly promote the implementation of Based Rollup based on its own AVS verification system.
This not only implements the new Based Rollup layer2 solution of UniFi but also practices the possibility of AVS providing security consensus for layer2. Additionally, based on the preprocessing mechanism provided by this Pre-Confirmation mechanism, it will become a unified interoperability center for the currently fragmented layer2s. In other words, the peer-to-peer relationship between layer2 and L1 can transform into a multi-point relationship between layer2 and the UniFi service package.
2) How is this done specifically?
Users initiate transactions on the UniFi layer2, and the transaction batches are directly submitted to the layer1 Proposer node for packaging. After sorting the transactions, the AVS nodes provide security consensus "verification" services, achieving a layer of "fast" pre-confirmation. This differs from traditional layer2 batch transactions, which require off-chain confirmation on layer2 before obtaining finality on the mainnet.
The entire process of UniFi layer2 only involves receiving and executing transactions, while other tasks such as sorting and verification are completed on the mainnet. For example, when a user withdraws on UniFi, they can receive quick confirmation, unlike OP-Rollup, which requires a 7-day challenge period.
To further optimize the finality speed, UniFi has developed a TEE + Multiprover dual verification architecture. This architecture isolates the verification process in a secure enclave of TEE (Trusted Execution Environment), allowing transactions to receive quick pre-confirmation from the TEE node cluster before waiting for L1 final confirmation, achieving millisecond-level consensus verification.
The introduction of TEE components not only fully utilizes the hardware computing power advantages of verification nodes but also provides a standardized security guarantee system for the AVS consensus mechanism, thereby establishing an efficient and reliable dual confirmation mechanism.
3) In this way, UniFi's layer2 solution abstracts two encapsulable services:
Decentralized Sequencer service, reusing L1 Validators to process transactions submitted by layer2 and responsible for sorting, which eliminates the current dependency of layer2 on centralized Sequencers.
Decentralized interoperability platform, where we treat the UniFi Rollup chain as the first service that commercializes the Puffer mainnet Proposer sorting node + AVS verification service. Theoretically, this component service can be combined with more layer2 chain applications. As more layer2s join the Rollup architecture constructed by UniFi, UniFi can serve as a trustless asset bridging channel between various layer2 chains, while also providing unified liquidity and application matching new services, allowing layer2 chains to achieve interoperability through UniFi.
That's all.
The essence of Based Rollup is essentially a new "Rollup AS A Service" service paradigm that relies more on the functions of the Ethereum mainnet (Proposer + AVS). It allows layer2 to enjoy more security and decentralization features of the Ethereum mainnet while enabling greater market implementation for the newly constructed encapsulated services of Based Rollup and AVS.
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