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fix Merkle proof generator

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Potuz 2024-07-08 13:32:33 -03:00
parent 93aa7d6bee
commit 9274a66199
5 changed files with 25 additions and 11 deletions
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1
presets/mainnet/eip-7732.yaml
View File

@ -7,4 +7,3 @@ PTC_SIZE: 512
# 2**2 (= 4)
MAX_PAYLOAD_ATTESTATIONS: 4
KZG_COMMITMENT_INCLUSION_PROOF_DEPTH_EIP7732: 13
KZG_GENERALIZED_INDEX_PREFIX: 486

1
presets/minimal/eip-7732.yaml
View File

@ -7,4 +7,3 @@ PTC_SIZE: 2
# 2**2 (= 4)
MAX_PAYLOAD_ATTESTATIONS: 4
KZG_COMMITMENT_INCLUSION_PROOF_DEPTH_EIP7732: 13
KZG_GENERALIZED_INDEX_PREFIX: 486

12
pysetup/spec_builders/eip7732.py
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@ -13,6 +13,16 @@ class EIP7732SpecBuilder(BaseSpecBuilder):
from eth2spec.electra import {preset_name} as electra
'''
@classmethod
def sundry_functions(cls) -> str:
return '''
def concat_generalized_indices(*indices: GeneralizedIndex) -> GeneralizedIndex:
o = GeneralizedIndex(1)
for i in indices:
o = GeneralizedIndex(o * bit_floor(i) + (i - bit_floor(i)))
return o'''
@classmethod
def hardcoded_custom_type_dep_constants(cls, spec_object) -> Dict[str, str]:
return {
@ -20,8 +30,6 @@ from eth2spec.electra import {preset_name} as electra
'MAX_PAYLOAD_ATTESTATIONS': spec_object.preset_vars['MAX_PAYLOAD_ATTESTATIONS'].value,
'KZG_COMMITMENT_INCLUSION_PROOF_DEPTH_EIP7732':
spec_object.preset_vars['KZG_COMMITMENT_INCLUSION_PROOF_DEPTH_EIP7732'].value,
'KZG_GENERALIZED_INDEX_PREFIX':
spec_object.preset_vars['KZG_GENERALIZED_INDEX_PREFIX'].value,
}
@classmethod

8
specs/_features/eip7732/builder.md
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@ -73,6 +73,10 @@ def get_blob_sidecars(signed_block: SignedBeaconBlock,
sidecars: List[BlobSidecar] = []
for index, blob in enumerate(blobs):
proof = compute_merkle_proof(
blob_kzg_commitments,
get_generalized_index(List[KZGCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK], index),
)
proof += compute_merkle_proof(
block.body,
get_generalized_index(
BeaconBlockBody,
@ -81,10 +85,6 @@ def get_blob_sidecars(signed_block: SignedBeaconBlock,
"blob_kzg_commitments_root",
),
)
proof += compute_merkle_proof(
blob_kzg_commitments,
get_generalized_index(List[KZGCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK], index),
)
sidecars.append(
BlobSidecar(
index=index,

14
specs/_features/eip7732/p2p-interface.md
View File

@ -36,7 +36,6 @@ This document contains the consensus-layer networking specification for EIP7732.
| Name | Value | Description |
|------------------------------------------|-----------------------------------|---------------------------------------------------------------------|
| `KZG_COMMITMENT_INCLUSION_PROOF_DEPTH_EIP7732` | `13` # TODO: Compute it when the spec stabilizes | Merkle proof depth for the `blob_kzg_commitments` list item |
| `KZG_GENERALIZED_INDEX_PREFIX` | `486` # TODO: Compute it when the spec stabilizes | Generalized index for the first item in the `blob_kzg_commitments` list |
### Containers
@ -63,8 +62,17 @@ class BlobSidecar(Container):
```python
def verify_blob_sidecar_inclusion_proof(blob_sidecar: BlobSidecar) -> bool:
# hardcoded here because the block does not include the commitments but only their root.
gindex = GeneralizedIndex(KZG_GENERALIZED_INDEX_PREFIX + blob_sidecar.index)
inner_gindex = get_generalized_index(
List[KZGCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK],
blob_sidecar.index
)
outer_gindex = get_generalized_index(
BeaconBlockBody,
"signed_execution_payload_header",
"message",
"blob_kzg_commitments_root",
)
gindex = get_subtree_index(concat_generalized_indices(outer_gindex, inner_gindex))
return is_valid_merkle_branch(
leaf=blob_sidecar.kzg_commitment.hash_tree_root(),