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Update 1_beacon_chain_misc.md

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vbuterin 2019-07-30 10:15:18 -04:00 committed by Hsiao-Wei Wang
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specs/core/1_beacon_chain_misc.md
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@ -13,6 +13,17 @@
<!-- /TOC --> <!-- /TOC -->
## Classes
#### `ShardReceiptProof`
```python
class ShardReceiptProof(Container):
shard: Shard
proof: List[Hash, PLACEHOLDER]
receipt: List[ShardReceiptDelta, PLACEHOLDER]
```
## Helpers ## Helpers
#### `pack_compact_validator` #### `pack_compact_validator`
@ -27,7 +38,7 @@ def pack_compact_validator(index: uint64, slashed: bool, balance_in_increments:
return (index << 16) + (slashed << 15) + balance_in_increments return (index << 16) + (slashed << 15) + balance_in_increments
``` ```
### `unpack_compact_validator` #### `unpack_compact_validator`
```python ```python
def unpack_compact_validator(compact_validator: uint64) -> Tuple[uint64, bool, uint64]: def unpack_compact_validator(compact_validator: uint64) -> Tuple[uint64, bool, uint64]:
@ -92,9 +103,9 @@ def get_generalized_index_of_crosslink_header(index: int) -> GeneralizedIndex:
#### `process_shard_receipt` #### `process_shard_receipt`
```python ```python
def process_shard_receipt(state: BeaconState, shard: Shard, proof: List[Hash, PLACEHOLDER], receipt: List[ShardReceiptDelta, PLACEHOLDER]): def process_shard_receipt(state: BeaconState, receipt_proof: ShardReceiptProof):
receipt_slot = state.next_shard_receipt_period[shard] * SLOTS_PER_EPOCH * EPOCHS_PER_SHARD_PERIOD receipt_slot = state.next_shard_receipt_period[receipt_proof.shard] * SLOTS_PER_EPOCH * EPOCHS_PER_SHARD_PERIOD
first_slot_in_last_crosslink = state.current_crosslinks[shard].start_epoch * SLOTS_PER_EPOCH first_slot_in_last_crosslink = state.current_crosslinks[receipt_proof.shard].start_epoch * SLOTS_PER_EPOCH
gindex = concat_generalized_indices( gindex = concat_generalized_indices(
get_generalized_index_of_crosslink_header(0), get_generalized_index_of_crosslink_header(0),
get_generalized_index(ShardBlockHeader, 'state_root') get_generalized_index(ShardBlockHeader, 'state_root')
@ -102,11 +113,16 @@ def process_shard_receipt(state: BeaconState, shard: Shard, proof: List[Hash, PL
get_generalized_index(ShardState, 'receipt_root') get_generalized_index(ShardState, 'receipt_root')
) )
assert verify_merkle_proof( assert verify_merkle_proof(
leaf=hash_tree_root(receipt), leaf=hash_tree_root(receipt_proof.receipt),
proof=proof, proof=receipt_proof.proof,
index=gindex, index=gindex,
root=state.current_crosslinks[shard].data_root root=state.current_crosslinks[shard].data_root
) )
for delta in receipt_proof.receipt:
increase_balance(state, delta.index, state.validators[delta.index].effective_balance * delta.reward_coefficient // REWARD_COEFFICIENT_BASE)
decrease_balance(state, delta.index, delta.block_fee)
state.next_shard_receipt_period[receipt_proof.shard] += 1
increase_balance(state, get_beacon_proposer_index(state), MICRO_REWARD)
``` ```
## Changes ## Changes
@ -133,3 +149,11 @@ def update_persistent_committee(state: BeaconState):
]) ])
state.next_persistent_committee_root = hash_tree_root(committees) state.next_persistent_committee_root = hash_tree_root(committees)
``` ```
### Shard receipt processing
Add to the beacon block body the following object:
* `shard_receipts: List[ShardReceipt, MAX_SHARD_RECEIPTS]`
Use `process_shard_receipt` to process each receipt.