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go-ethereum/docs/upgrade.md

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Upgrade Notes

Prague / EIP-2935

  • The history storage contract is predeployed only in the developer genesis.
  • For other networks, the contract is deployed at Prague activation by the system call during block processing and state access.
  • Nodes upgrading after Prague will perform a one-time backfill of recent parent hashes into the ring buffer. If historical headers are pruned or unavailable, missing slots are skipped and only available hashes are filled.
  • If you maintain a custom genesis and want predeployment, add an account entry for HistoryStorageAddress with Nonce: 1 and Code: HistoryStorageCode.