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docs(prover): explain why header.state_root replaces morph_diskRoot #956

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Merged
chengwenxi merged 1 commit into from
May 18, 2026
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docs(prover): explain why header.state_root replaces morph_diskRoot #956

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4 changes: 4 additions & 0 deletions prover/crates/executor/host/src/execute.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,9 @@ impl HostExecutor {
let block = query_block(block_number, provider)
.await
.with_context(|| format!("query_block failed for block {block_number}"))?;
// Post-MPT migration (PR #886), the L2 state trie is a standard Ethereum MPT, so
// `header.state_root` is authoritative and replaces the previous custom `morph_diskRoot`
// RPC field. The root is re-derived locally below and checked against this value.
let post_state_root = block.header.state_root;

// layer2 chain id
Expand All @@ -49,6 +52,7 @@ impl HostExecutor {
let prev_block = query_block(prev_block_number, provider)
.await
.with_context(|| format!("query_block failed for prev block {prev_block_number}"))?;
// Same rationale as `post_state_root`: header state_root is the MPT root.
let prev_state_root = prev_block.header.state_root;

let tx_count = block.transactions.len();
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