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eip7685: Pass execution_requests_hash to is_valid_block_hash #3950

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eip7685: Pass execution_requests_hash to is_valid_block_hash #3950

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8f2cb7c
Pass execution_requests_hash to notify_new_payload
mkalinin Sep 30, 2024
a00d1fd
Apply suggestions by @ralexstokes
mkalinin Oct 1, 2024
69b7be5
Fix expression order in verify_and_notify_new_payload
mkalinin Oct 1, 2024
21fdd85
Pass execution_requests_hash only to is_valid_block_hash
mkalinin Oct 1, 2024
601631f
Send execution_requests to EE as a list of byte sequences
mkalinin Oct 3, 2024
6f4cc2b
Revert "Send execution_requests to EE as a list of byte sequences"
jtraglia Oct 7, 2024
ca62ad1
Fix hash computation
jtraglia Oct 7, 2024
3e3eec6
Delete trailing whitespace
jtraglia Oct 7, 2024
e02c2ee
Merge remote-tracking branch 'upstream/dev' into el-requests
jtraglia Oct 7, 2024
04b2a55
Compute requests hash in verify_and_notify_new_payload
jtraglia Oct 8, 2024
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1 change: 1 addition & 0 deletions pysetup/spec_builders/electra.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ class ElectraSpecBuilder(BaseSpecBuilder):
def imports(cls, preset_name: str):
return f'''
from eth2spec.deneb import {preset_name} as deneb
from eth2spec.utils.ssz.ssz_impl import serialize
'''

@classmethod
Expand Down
42 changes: 33 additions & 9 deletions specs/electra/beacon-chain.md
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
- [Constants](#constants)
- [Misc](#misc)
- [Withdrawal prefixes](#withdrawal-prefixes)
- [Execution layer triggered requests](#execution-layer-triggered-requests)
- [Preset](#preset)
- [Gwei values](#gwei-values)
- [Rewards and penalties](#rewards-and-penalties)
Expand Down Expand Up @@ -84,6 +85,7 @@
- [Modified `get_expected_withdrawals`](#modified-get_expected_withdrawals)
- [Modified `process_withdrawals`](#modified-process_withdrawals)
- [Execution payload](#execution-payload)
- [New `compute_execution_requests_hash`](#new-compute_execution_requests_hash)
- [Modified `process_execution_payload`](#modified-process_execution_payload)
- [Operations](#operations)
- [Modified `process_operations`](#modified-process_operations)
Expand Down Expand Up @@ -134,6 +136,14 @@ The following values are (non-configurable) constants used throughout the specif
| - | - |
| `COMPOUNDING_WITHDRAWAL_PREFIX` | `Bytes1('0x02')` |

### Execution layer triggered requests

| Name | Value |
| - | - |
| `DEPOSIT_REQUEST_TYPE` | `Bytes1('0x00')` |
| `WITHDRAWAL_REQUEST_TYPE` | `Bytes1('0x01')` |
| `CONSOLIDATION_REQUEST_TYPE` | `Bytes1('0x02')` |

## Preset

### Gwei values
Expand Down Expand Up @@ -930,20 +940,20 @@ class NewPayloadRequest(object):
execution_payload: ExecutionPayload
versioned_hashes: Sequence[VersionedHash]
parent_beacon_block_root: Root
execution_requests: ExecutionRequests # [New in Electra]
execution_requests_hash: Hash32 # [New in Electra]
```

#### Engine APIs

##### Modified `notify_new_payload`

*Note*: The function `notify_new_payload` is modified to include the additional `execution_requests` parameter in Electra.
*Note*: The function `notify_new_payload` is modified to include the additional `execution_requests_hash` parameter in Electra.

```python
def notify_new_payload(self: ExecutionEngine,
execution_payload: ExecutionPayload,
execution_requests: ExecutionRequests,
parent_beacon_block_root: Root) -> bool:
parent_beacon_block_root: Root,
execution_requests_hash: execution_requests_hash) -> bool:
"""
Return ``True`` if and only if ``execution_payload`` and ``execution_requests``
are valid with respect to ``self.execution_state``.
Expand All @@ -963,7 +973,7 @@ def verify_and_notify_new_payload(self: ExecutionEngine,
Return ``True`` if and only if ``new_payload_request`` is valid with respect to ``self.execution_state``.
"""
execution_payload = new_payload_request.execution_payload
execution_requests = new_payload_request.execution_requests # [New in Electra]
execution_requests_hash = new_payload_request.execution_requests_hash # [New in Electra]
parent_beacon_block_root = new_payload_request.parent_beacon_block_root
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if not self.is_valid_block_hash(execution_payload, parent_beacon_block_root):
Expand All @@ -974,9 +984,9 @@ def verify_and_notify_new_payload(self: ExecutionEngine,

# [Modified in Electra]
if not self.notify_new_payload(
execution_payload,
execution_requests,
parent_beacon_block_root):
execution_payload,
parent_beacon_block_root,
execution_requests_hash):
return False

return True
Expand Down Expand Up @@ -1090,6 +1100,20 @@ def process_withdrawals(state: BeaconState, payload: ExecutionPayload) -> None:

#### Execution payload

##### New `compute_execution_requests_hash`

*Note*: Computes commitment to the execution layer triggered requests data.
The computation algorithm is defined by [EIP-7685](https://eips.ethereum.org/EIPS/eip-7685).

```python
def compute_execution_requests_hash(execution_requests: ExecutionRequests) -> Hash32:
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Alternatively we can do:

def compute_execution_requests_hash(execution_requests: ExecutionRequests) -> Hash32:
    request_list = [execution_requests.deposits, execution_requests.withdrawals, execution_requests.consolidations]
    hash_list = []
    for index, requests in enumerate(requests_list):
        request_type = uint_to_bytes(uint8(index))
        hash_list.append(hash(request_type + serialize(requests)))

    return hash(b''.join(hash_list))

This allows to get rid of explicit type bytes in the spec and easy to extend in the future by adding requests to the flat list used for commitment computation

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I thought we wanted to get rid of these custom one-off hashing schemes that are just a mess to maintain over time?

deposit_bytes = DEPOSIT_REQUEST_TYPE + serialize(execution_requests.deposits)
withdrawal_bytes = WITHDRAWAL_REQUEST_TYPE + serialize(execution_requests.withdrawals)
consolidation_bytes = CONSOLIDATION_REQUEST_TYPE + serialize(execution_requests.consolidations)

return hash(deposit_bytes + withdrawal_bytes + consolidation_bytes)
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```

##### Modified `process_execution_payload`

*Note*: The function `process_execution_payload` is modified to pass `execution_requests` into `execution_engine.verify_and_notify_new_payload` (via the updated `NewPayloadRequest`).
Expand All @@ -1111,9 +1135,9 @@ def process_execution_payload(state: BeaconState, body: BeaconBlockBody, executi
assert execution_engine.verify_and_notify_new_payload(
NewPayloadRequest(
execution_payload=payload,
execution_requests=body.execution_requests, # [New in Electra]
versioned_hashes=versioned_hashes,
parent_beacon_block_root=state.latest_block_header.parent_root,
execution_requests_hash=compute_execution_requests_hash(execution_requests), # [New in Electra]
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)
)
# Cache execution payload header
Expand Down
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