Avail “Data-Driven Bridge” Interpretation: How to Help L2 Rollup Stacks Enable Validium and Volition Modes?

Avail, a modular blockchain project on Polygon, has launched a “Data Proof Bridge” that can transform L2 solutions into Validiums, Volitions, and even independent ecosystems, while making L3 solutions economically viable. The Avail team has written an analysis and interpretation of the efficiency and security of this solution.

The issue of data availability cost not only affects the economic feasibility of L2 solutions, but also hinders their ability to expand and serve a larger user base. Avail’s “Data Proof Bridge” builds a direct link between L2 Rollup data and L1 Rollup data through Avail’s off-chain data availability layer. This transformation is significant. Firstly, it allows L2 solutions to operate at a lower cost, making them more attractive to developers and users. Secondly, by eliminating the need for on-chain data availability, these solutions can achieve a higher level of scalability.

In the absence of an off-chain data availability layer, building and operating L3 solutions becomes an economically challenging task. Typically, L3 solutions collect transactions to form execution proofs, which are then forwarded to their L2 counterparts, but this design creates a huge economic burden. Avail’s “Data Proof Bridge” introduces a transformative solution to this economic challenge, allowing L3 Rollups to evolve into L3 Validiums. In this mode, L3 Rollups no longer need to send both proofs and data to L2 at the same time. Instead, they can directly publish data to Avail and only send proofs to L2.

How L2 Validiums work on Ethereum: 1) Data publishing: L2 solutions publish transaction data or state differences as data blocks to Avail; 2) Proof creation: Avail’s block header contains two types of proofs. Avail’s vast majority of validators sign on the chain containing the block header using the GRANDBlocking protocol to achieve final validation of the block header; 3) Authentication bridging: The “Data Proof Bridge” forwards the authenticated Merkle Root from Avail to a specific cross-chain bridge contract on Ethereum as proof of consensus for data availability by Avail validators; 4) Optimistic validation: The waiting period begins, during which proofs are considered valid unless challenged; 5) Final validation on Ethereum: L2 submits execution proofs corresponding to the transaction data or state differences that caused the state transition.

Reference: https://blog.availproject.org/data-attestation-bridge/

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