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Opti sync: how to apply latestValidHash when payload is INVALID #2954

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Aug 3, 2022
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Opti sync: how to apply latestValidHash when payload is INVALID #2954

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4893f9e
Handling `latestValidHash` in opti-sync
mkalinin Jul 27, 2022
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Add ToC
hwwhww Jul 27, 2022
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Merge pull request #2956 from ethereum/opti-sync-toc
hwwhww Jul 28, 2022
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djrtwo Aug 1, 2022
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18 changes: 18 additions & 0 deletions sync/optimistic.md
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Expand Up @@ -163,6 +163,24 @@ the merge block MUST be treated the same as
an `INVALIDATED` block (i.e., it and all its descendants are invalidated and
removed from the block tree).

### How to apply `latestValidHash` when payload status is `INVALID`

Processing the `INVALID` payload status by consensus engine
depends on the value returned in `latestValidHash` parameter.
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The general approach is as follows:
1. Consensus engine MUST identify `invalidBlock` as per definition in the table below
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2. `invalidBlock` and all its descendants MUST be transitioned from `NOT_VALIDATED` to `INVALIDATED`
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| `latestValidHash` | `invalidBlock` |
|:- |:- |
| Execution block hash | The *child* of a block with `body.execution_payload.block_hash == latestValidHash` in the chain containing a block with payload in question |
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| `0x00..00` (all zeroes) | The first block with `body.execution_payload != ExecutionPayload()` in the chain containing a block with payload in question |
| `null` | Block with payload in question |

When `latestValidHash` is a meaningful execution block hash but consensus engine
can't find a block satisfying `body.execution_payload.block_hash == latestValidHash`,
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consensus engine SHOULD behave the same as if `latestValidHash` was `null`.

### Execution Engine Errors

When an execution engine returns an error or fails to respond to a payload
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