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fix: gloas from genesis

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- Fix forkchoice update sending zero-hash head to EL at genesis by reading
  latest_block_hash from state when the genesis bid hashes are all zeros
- Simplify genesis block construction — the genesis block body is empty per
  spec, remove the incorrect bid-copying logic and body root override in
  initialize_beacon_state_from_eth1
This commit is contained in:
Josh King
2026-04-27 23:26:29 +02:00
committed by Eitan Seri-Levi
parent effcd08223
commit 0078b6be89
2 changed files with 22 additions and 25 deletions
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28
consensus/state_processing/src/genesis.rs
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@@ -167,19 +167,12 @@ pub fn initialize_beacon_state_from_eth1<E: EthSpec>(
// Remove intermediate Fulu fork from `state.fork`.
state.fork_mut().previous_version = spec.gloas_fork_version;
// The genesis block's bid must have block_hash = 0x00 per spec (empty payload).
// Retain the EL genesis hash in latest_block_hash and parent_block_hash so the
// first post-genesis proposer can build on the correct EL head.
let el_genesis_hash = state.latest_execution_payload_bid()?.block_hash;
let bid = state.latest_execution_payload_bid_mut()?;
bid.parent_block_hash = el_genesis_hash;
bid.block_hash = ExecutionBlockHash::default();
// Update the `latest_block_header.body_root` so that it matches the body of the
// Gloas genesis block, which embeds `state.latest_execution_payload_bid` in its
// `signed_execution_payload_bid` field (see `genesis_block`).
let genesis_body_root = genesis_block(&state, spec)?.body_root();
state.latest_block_header_mut().body_root = genesis_body_root;
}
// Now that we have our validators, initialize the caches (including the committees)
@@ -191,25 +184,16 @@ pub fn initialize_beacon_state_from_eth1<E: EthSpec>(
Ok(state)
}
/// Create an unsigned genesis `BeaconBlock`.
/// Create an unsigned genesis `BeaconBlock` matching the genesis state.
///
/// Per spec, the genesis block body is empty (all default fields) except for Gloas,
/// where `body.signed_execution_payload_bid.message` is initialised from
/// `state.latest_execution_payload_bid` so that the first post-genesis proposer can
/// build on the correct execution layer head.
///
/// `state.latest_block_header.body_root` is set from this same block's body, so the
/// two must stay in sync.
/// Per spec, the genesis block body is empty (all default fields).
/// `state.latest_block_header.body_root` is set from `BeaconBlock::empty()`,
/// so this function must return the same empty block to keep roots consistent.
pub fn genesis_block<E: EthSpec>(
state: &BeaconState<E>,
_genesis_state: &BeaconState<E>,
spec: &ChainSpec,
) -> Result<BeaconBlock<E>, BeaconStateError> {
let mut block = BeaconBlock::empty(spec);
if let BeaconBlock::Gloas(ref mut gloas_block) = block {
let bid = state.latest_execution_payload_bid()?.clone();
gloas_block.body.signed_execution_payload_bid.message = bid;
}
Ok(block)
Ok(BeaconBlock::empty(spec))
}
/// Determine whether a candidate genesis state is suitable for starting the chain.