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fix: get dc sidecar

This commit is contained in:
Agnish Ghosh 2024-07-05 15:56:03 +05:30
parent fab427d65f
commit 086d3f1fdc
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GPG Key ID: 7BDDA05D1B25E9F8
1 changed files with 9 additions and 15 deletions
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22
beacon_chain/spec/eip7594_helpers.nim
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@ -215,18 +215,12 @@ proc get_data_column_sidecars*(signed_block: deneb.SignedBeaconBlock |
electra.SignedBeaconBlock,
blobs: seq[KzgBlob]):
Result[seq[DataColumnSidecar], cstring] =
var
sidecar: DataColumnSidecar
blck = signed_block.message
signed_beacon_block_header = compute_signed_block_header(signed_block)
cellsAndProofs: seq[KzgCellsAndKzgProofs]
kzg_incl_proof: array[4, Eth2Digest]
blck.body.build_proof(
11.GeneralizedIndex,
kzg_incl_proof).expect("Valid gindex")
for blob in blobs:
let
computed_cell = computeCellsAndProofs(blob)
@ -249,7 +243,7 @@ proc get_data_column_sidecars*(signed_block: deneb.SignedBeaconBlock |
for j in 0..<int(MAX_BLOB_COMMITMENTS_PER_BLOCK):
proofs[i].add(cellsAndProofs[i].proofs[j])
var sidecars: seq[DataColumnSidecar]
var sidecars: newSeqOfCap[DataColumnSidecar](NUMBER_OF_COLUMNS)
for columnIndex in 0..<NUMBER_OF_COLUMNS:
var column: DataColumn
@ -260,16 +254,16 @@ proc get_data_column_sidecars*(signed_block: deneb.SignedBeaconBlock |
for rowIndex in 0..<blobCount:
kzgProofOfColumn[rowIndex] = proofs[rowIndex][columnIndex]
sidecar = DataColumnSidecar(
var sidecar = DataColumnSidecar(
index: ColumnIndex(columnIndex),
column: column,
kzgCommitments: blck.body.blob_kzg_commitments,
kzgProofs: kzgProofOfColumn,
signed_block_header: signed_beacon_block_header,
kzg_commitments_inclusion_proof: kzg_incl_proof
)
signed_block_header: signed_beacon_block_header)
blck.body.build_proof(
kzg_commitment_inclusion_proof_gindex(columnIndex),
sidecar.kzg_commitment_inclusion_proof).expect("Valid gindex")
sidecars.add(sidecar)
ok(sidecars)
# Helper function to `verifyCellKzgProofBatch` at https://github.com/ethereum/c-kzg-4844/blob/das/bindings/nim/kzg_ex.nim#L170
@ -327,12 +321,12 @@ proc verify_data_column_sidecar_kzg_proofs*(sidecar: DataColumnSidecar): Result[
# https://github.com/ethereum/consensus-specs/blob/5f48840f4d768bf0e0a8156a3ed06ec333589007/specs/_features/eip7594/p2p-interface.md#verify_data_column_sidecar_inclusion_proof
func verify_data_column_sidecar_inclusion_proof*(sidecar: DataColumnSidecar): Result[void, string] =
# Verify if the given KZG commitments are included in the beacon block
let gindex = 11.GeneralizedIndex
let gindex = kzg_commitment_inclusion_proof_gindex(sidecar.index)
if not is_valid_merkle_branch(
hash_tree_root(sidecar.kzg_commitments),
sidecar.kzg_commitments_inclusion_proof,
KZG_COMMITMENT_INCLUSION_PROOF_DEPTH,
gindex,
get_subtree_index(gindex),
sidecar.signed_block_header.message.body_root):
return err("DataColumnSidecar: inclusion proof not valid")