https://github.com/kevincharm/randao-accessor

Access historical prevrandao values onchain
https://github.com/kevincharm/randao-accessor

ethereum randao rlp solidity

Last synced: about 5 hours ago
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Access historical prevrandao values onchain

• Host: GitHub
• URL: https://github.com/kevincharm/randao-accessor
• Owner: kevincharm
• License: mit
• Created: 2023-07-15T18:23:59.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2023-07-15T18:24:11.000Z (over 1 year ago)
• Last Synced: 2024-04-14T13:46:02.378Z (7 months ago)
• Topics: ethereum, randao, rlp, solidity
• Language: Solidity
• Homepage:
• Size: 191 KB
• Stars: 3
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
```diff

- THIS CODEBASE HAS NOT BEEN AUDITED

```

# 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](https://docs.axiom.xyz/developers/reading-historic-block-data).

## 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](https://www.npmjs.com/package/@axiom-crypto/core) when accessing older blocks. See [Reading Historic Block Data](https://docs.axiom.xyz/developers/reading-historic-block-data) for more information.