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Randao Accessor

Access historical prevrandao values onchain by submitting RLP-encoded block headers and validating them against block hashes. When accessing blocks older than the previous 256 blocks, extra witness data is required to validate against Axiom's block hash cache.

Generating inputs

To generate RLP-encoded block headers, you'll need access to an Ethereum execution RPC. See the getBlockWithRLP function in test/util/rlp.ts for an example of how to fetch block data and how to encode the data into RLP format.

A witness can be generated using the Axiom SDK when accessing older blocks. See Reading Historic Block Data for more information.