> For the complete documentation index, see [llms.txt](https://docs.sanko.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sanko.xyz/sanko/sanko-overview/anytrust-and-the-data-availability-committee.md).

# AnyTrust and the Data Availability Committee

<figure><img src="/files/jYVEggulBK2D4Ce7BUX8" alt=""><figcaption><p>Sanko's initial Data Availability Cohort</p></figcaption></figure>

Sanko achieves subcent transaction fees in part by significantly reducing the costs associated with posting transaction data – the largest cost component for most optimistic rollups.

Sanko adopts a minimal trust assumption in the form of the Data Availability Committee – a cohort of validators responsible for storing transaction data and providing it on demand. Rather than posting full data blocks, Committee members post Data Availability Certificates (DACerts) containing the hash of a data block, an expiration time, and proof that a sufficient number of Committee members have signed the pair attesting to the validity of the block.&#x20;

Sanko assumes that at least two Committee members are honest; thus, if the Committee has N members and N – 1 promise to provide access to transaction data, at least one of the promisers will provide data as needed to ensure the proper functioning of the chain.

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