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fix(sequencer): use wall-clock timestamp for simulation when pipelining is disabled #21888

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Merged
alexghr merged 3 commits into from
Mar 23, 2026
Merged

fix(sequencer): use wall-clock timestamp for simulation when pipelining is disabled #21888

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0200a59
fix(sequencer): restore L1 block timestamp floor for eth_simulateV1
AztecBot Mar 23, 2026
a19f3be
fix(sequencer): use wall-clock timestamp for simulation when pipelini…
AztecBot Mar 23, 2026
bcbb8ce
fix: use L1 block timestamp + ethereumSlotDuration instead of getNext…
AztecBot Mar 23, 2026
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11 changes: 8 additions & 3 deletions yarn-project/sequencer-client/src/publisher/sequencer-publisher.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -821,9 +821,14 @@ export class SequencerPublisher {
attestationsAndSignersSignature: Signature,
options: { forcePendingCheckpointNumber?: CheckpointNumber },
): Promise<bigint> {
// Anchor the simulation timestamp to the checkpoint's own slot start time
// rather than the current L1 block timestamp, which may overshoot into the next slot if the build ran late.
const ts = checkpoint.header.timestamp;
// When pipelining, the checkpoint targets the next slot so its timestamp is in the future.
// Without pipelining, the checkpoint targets the current slot so its timestamp is in the past
// by the time we simulate (~24s of build time), causing eth_simulateV1 to reject it.
// In that case, use the latest L1 block timestamp + one ethereum slot, which is just ahead
// of L1 and still within the same L2 slot.
const ts = this.epochCache.isProposerPipeliningEnabled()
? checkpoint.header.timestamp
: (await this.l1TxUtils.getBlock()).timestamp + this.ethereumSlotDuration;
const blobFields = checkpoint.toBlobFields();
const blobs = await getBlobsPerL1Block(blobFields);
const blobInput = getPrefixedEthBlobCommitments(blobs);
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