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eth2.0-specs
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Homogenise AttestationSignedData data structure

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Justin 2018-10-05 11:20:02 +01:00 committed by GitHub
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1 changed files with 10 additions and 5 deletions
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specs/beacon-chain.md
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@ -119,16 +119,21 @@ An `AttestationRecord` has the following fields:
}
```
Here's the data signed (`AttestationSignedData`):
An `AttestationSignedData` has the following fields:
```python
fields = {
# Version of the chain
{
# Chain version
'version': 'int64',
# Slot number
'slot': 'int64',
# Shard number
'shard': 'int16',
# 31 parent hashes
'parent_hashes': ['hash32'],
'shard_id': 'int16',
# Shard block hash
'shard_block_hash': 'hash32',
# Slot of last justified block
'justified_slot': 'int64'
}
```
@ -491,7 +496,7 @@ For each one of these attestations:
* Verify that `len(attester_bitfield) == ceil_div8(len(attestation_indices))`, where `ceil_div8 = (x + 7) // 8`. Verify that bits `len(attestation_indices)....` and higher, if present (i.e. `len(attestation_indices)` is not a multiple of 8), are all zero
* Derive a group public key by adding the public keys of all of the attesters in `attestation_indices` for whom the corresponding bit in `attester_bitfield` (the ith bit is `(attester_bitfield[i // 8] >> (7 - (i %8))) % 2`) equals 1
* Let `version = pre_fork_version if slot < fork_slot_number else post_fork_version`.
* Verify that `aggregate_sig` verifies using the group pubkey generated and the serialized form of `AttestationSignedData(version, slot, parent_hashes, shard_id, shard_block_hash, justified_slot)` as the message.
* Verify that `aggregate_sig` verifies using the group pubkey generated and the serialized form of `AttestationSignedData(version, slot, parent_hashes, shard, shard_block_hash, justified_slot)` as the message.
Extend the list of `AttestationRecord` objects in the `active_state` with those included in the block, ordering the new additions in the same order as they came in the block. Similarly extend the list of `SpecialRecord` objects in the `active_state` with those included in the block.