# Reducing Costs Through Trust Assumptions At the heart of the Arbitrum protocol lies the requirement for all its nodes, including validators responsible for verifying chain accuracy and staking on correct outcomes, to access data from every Layer 2 (L2) transaction within the Arbitrum chain's inbox. Traditionally, achieving this data access involved posting data on Layer 1 (L1) Ethereum as calldata, incurring significant Ethereum gas fees, the primary cost factor in Arbitrum. However, AnyTrust introduces a fundamental change by delegating the storage and on-demand provision of data to an external entity called the Data Availability Committee (the "Committee"). Comprising N members, the Committee operates under the trust assumption that at least two members are honest. This assumption ensures data availability critical for the rollup protocol's proper functioning. Even if N-1 Committee members pledge access to certain data, the trust assumption guarantees that at least one entity must be honest, ensuring data availability until the specified expiration time. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.roguechain.io/rogue-protocol/rogue-chain/anytrust-revolutionizing-blockchain-infrastructure/reducing-costs-through-trust-assumptions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.