Calculate payload_id locally

[SozinM]

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Name	Status	Preview	Comments	Updated (UTC)
rollup-boost	⬜️ Ignored (Inspect)	Visit Preview		Jun 17, 2025 1:13pm

[avalonche]

isn't there an existing function in alloy that calculates this?

[0xOsiris]

isn't there an existing function in alloy that calculates this?

This was taken from Reth I believe: https://github.com/paradigmxyz/reth/blob/671f0fe566a4906a582027e2781c52b1e2bf3104/crates/optimism/payload/src/payload.rs#L330

This impl could change. imo we should expose this in Reth if we want this logic, and upstream. Also what we are benefiting by including this logic other than incurred latency on FCU's?

[0xKitsune]

Agreed with @0xOsiris, what is the motivation for this change? Is there a reason that we are calculating the payload id locally here?

[SozinM]

Hi @0xKitsune @0xOsiris @avalonche sorry for no context :)
We had race condition linked to builder sending first flashblock faster then return FCU answer, this was causing missing flashblocks.
I've copied this function for now, but reth already merging PR to expose this function, so once we update to needed release we will use this function from reth. paradigmxyz/reth#16931