EL-triggered consolidations

presets/mainnet/electra.yaml

@@ -30,7 +30,7 @@ MAX_ATTESTER_SLASHINGS_ELECTRA: 1
 # `uint64(2**3)` (= 8)
 MAX_ATTESTATIONS_ELECTRA: 8
 # `uint64(2**0)` (= 1)
-MAX_CONSOLIDATIONS: 1
+MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD: 1
 
 # Execution
 # ---------------------------------------------------------------

presets/minimal/electra.yaml

@@ -30,7 +30,7 @@ MAX_ATTESTER_SLASHINGS_ELECTRA: 1
 # `uint64(2**3)` (= 8)
 MAX_ATTESTATIONS_ELECTRA: 8
 # `uint64(2**0)` (= 1)
-MAX_CONSOLIDATIONS: 1
+MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD: 1
 
 # Execution
 # ---------------------------------------------------------------

specs/electra/beacon-chain.md

@@ -28,8 +28,7 @@
     - [`PendingBalanceDeposit`](#pendingbalancedeposit)
     - [`PendingPartialWithdrawal`](#pendingpartialwithdrawal)
     - [`ExecutionLayerWithdrawalRequest`](#executionlayerwithdrawalrequest)
-    - [`Consolidation`](#consolidation)
-    - [`SignedConsolidation`](#signedconsolidation)
+    - [`ExecutionLayerConsolidationRequest`](#executionlayerconsolidationrequest)
     - [`PendingConsolidation`](#pendingconsolidation)
   - [Modified Containers](#modified-containers)
     - [`AttesterSlashing`](#attesterslashing)
@@ -94,8 +93,8 @@
         - [New `process_execution_layer_withdrawal_request`](#new-process_execution_layer_withdrawal_request)
       - [Deposit receipts](#deposit-receipts)
         - [New `process_deposit_receipt`](#new-process_deposit_receipt)
-      - [Consolidations](#consolidations)
-        - [New `process_consolidation`](#new-process_consolidation)
+      - [Execution layer consolidation requests](#execution-layer-consolidation-requests)
+        - [New `process_execution_layer_consolidation_request`](#new-process_execution_layer_consolidation_request)
 - [Testing](#testing)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
@@ -164,16 +163,16 @@ The following values are (non-configurable) constants used throughout the specif
 
 | Name | Value |
 | - | - |
-| `MAX_CONSOLIDATIONS` | `uint64(1)` |
+| `MAX_ATTESTER_SLASHINGS_ELECTRA`   | `2**0` (= 1) | *[New in Electra:EIP7549]* |
+| `MAX_ATTESTATIONS_ELECTRA` | `2**3` (= 8) | *[New in Electra:EIP7549]* |
 
 ### Execution
 
 | Name | Value | Description |
 | - | - | - |
 | `MAX_DEPOSIT_RECEIPTS_PER_PAYLOAD` | `uint64(2**13)` (= 8,192) | *[New in Electra:EIP6110]* Maximum number of deposit receipts allowed in each payload |
-| `MAX_ATTESTER_SLASHINGS_ELECTRA`   | `2**0` (= 1) | *[New in Electra:EIP7549]* |
-| `MAX_ATTESTATIONS_ELECTRA` | `2**3` (= 8) | *[New in Electra:EIP7549]* |
 | `MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD` | `uint64(2**4)` (= 16)| *[New in Electra:EIP7002]* Maximum number of execution layer withdrawal requests in each payload |
+| `MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD` | `uint64(1)` (= 1) | *[New in Electra:EIP7002]* Maximum number of execution layer consolidation requests in each payload |
 
 ### Withdrawals processing
 
@@ -238,25 +237,15 @@ class ExecutionLayerWithdrawalRequest(Container):
     amount: Gwei
 ```
 
-#### `Consolidation`
-
-*Note*: The container is new in EIP7251.
-
-```python
-class Consolidation(Container):
-    source_index: ValidatorIndex
-    target_index: ValidatorIndex
-    epoch: Epoch
-```
-
-#### `SignedConsolidation`
+#### `ExecutionLayerConsolidationRequest`
 
 *Note*: The container is new in EIP7251.
 
 ```python
-class SignedConsolidation(Container):
-    message: Consolidation
-    signature: BLSSignature
+class ExecutionLayerConsolidationRequest(Container):
+    source_address: ExecutionAddress
+    source_pubkey: BLSPubkey
+    target_pubkey: BLSPubkey
 ```
 
 #### `PendingConsolidation`
@@ -319,7 +308,6 @@ class BeaconBlockBody(Container):
     execution_payload: ExecutionPayload  # [Modified in Electra:EIP6110:EIP7002]
     bls_to_execution_changes: List[SignedBLSToExecutionChange, MAX_BLS_TO_EXECUTION_CHANGES]
     blob_kzg_commitments: List[KZGCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK]
-    consolidations: List[SignedConsolidation, MAX_CONSOLIDATIONS]  # [New in Electra:EIP7251]
 ```
 
 #### `ExecutionPayload`
@@ -348,6 +336,8 @@ class ExecutionPayload(Container):
     deposit_receipts: List[DepositReceipt, MAX_DEPOSIT_RECEIPTS_PER_PAYLOAD]  # [New in Electra:EIP6110]
     # [New in Electra:EIP7002:EIP7251]
     withdrawal_requests: List[ExecutionLayerWithdrawalRequest, MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD]
+    # [New in Electra:EIP7251]
+    consolidation_requests: List[ExecutionLayerConsolidationRequest, MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD]
 ```
 
 #### `ExecutionPayloadHeader`
@@ -375,6 +365,7 @@ class ExecutionPayloadHeader(Container):
     excess_blob_gas: uint64
     deposit_receipts_root: Root  # [New in Electra:EIP6110]
     withdrawal_requests_root: Root  # [New in Electra:EIP7002:EIP7251]
+    consolidation_requests_root: Root  # [New in Electra:EIP7251]
 ```
 
 #### `BeaconState`
@@ -1013,6 +1004,7 @@ def process_execution_payload(state: BeaconState, body: BeaconBlockBody, executi
         excess_blob_gas=payload.excess_blob_gas,
         deposit_receipts_root=hash_tree_root(payload.deposit_receipts),  # [New in Electra:EIP6110]
         withdrawal_requests_root=hash_tree_root(payload.withdrawal_requests),  # [New in Electra:EIP7002:EIP7251]
+        consolidation_requests_root=hash_tree_root(payload.consolidation_requests),  # [New in Electra:EIP7251]
     )
 ```
 
@@ -1042,10 +1034,11 @@ def process_operations(state: BeaconState, body: BeaconBlockBody) -> None:
     for_ops(body.deposits, process_deposit)  # [Modified in Electra:EIP7251]
     for_ops(body.voluntary_exits, process_voluntary_exit)  # [Modified in Electra:EIP7251]
     for_ops(body.bls_to_execution_changes, process_bls_to_execution_change)
+    for_ops(body.execution_payload.deposit_receipts, process_deposit_receipt)  # [New in Electra:EIP6110]
     # [New in Electra:EIP7002:EIP7251]
     for_ops(body.execution_payload.withdrawal_requests, process_execution_layer_withdrawal_request)
-    for_ops(body.execution_payload.deposit_receipts, process_deposit_receipt)  # [New in Electra:EIP6110]
-    for_ops(body.consolidations, process_consolidation)  # [New in Electra:EIP7251]
+    # [New in Electra:EIP7251]
+    for_ops(body.execution_payload.consolidation_requests, process_execution_layer_consolidation_request)
 ```
 
 ##### Attestations
@@ -1292,43 +1285,62 @@ def process_deposit_receipt(state: BeaconState, deposit_receipt: DepositReceipt)
     )
 ```
 
-##### Consolidations
+##### Execution layer consolidation requests
 
-###### New `process_consolidation`
+###### New `process_execution_layer_consolidation_request`
 
 ```python
-def process_consolidation(state: BeaconState, signed_consolidation: SignedConsolidation) -> None:
-    # If the pending consolidations queue is full, no consolidations are allowed in the block
-    assert len(state.pending_consolidations) < PENDING_CONSOLIDATIONS_LIMIT
-    # If there is too little available consolidation churn limit, no consolidations are allowed in the block
-    assert get_consolidation_churn_limit(state) > MIN_ACTIVATION_BALANCE
-    consolidation = signed_consolidation.message
+def process_execution_layer_consolidation_request(
+    state: BeaconState,
+    execution_layer_consolidation_request: ExecutionLayerConsolidationRequest
+) -> None:
+    # If the pending consolidations queue is full, consolidation requests are ignored
+    if len(state.pending_consolidations) == PENDING_CONSOLIDATIONS_LIMIT:
+        return
+    # If there is too little available consolidation churn limit, consolidation requests are ignored
+    if get_consolidation_churn_limit(state) <= MIN_ACTIVATION_BALANCE:
+        return
+
+    validator_pubkeys = [v.pubkey for v in state.validators]
+    # Verify pubkeys exists
+    request_source_pubkey = execution_layer_consolidation_request.source_pubkey
+    request_target_pubkey = execution_layer_consolidation_request.target_pubkey
+    if request_source_pubkey not in validator_pubkeys:
+        return
+    if request_target_pubkey not in validator_pubkeys:
+        return
+    source_index = ValidatorIndex(validator_pubkeys.index(request_source_pubkey))
+    target_index = ValidatorIndex(validator_pubkeys.index(request_target_pubkey))
+    source_validator = state.validators[source_index]
+    target_validator = state.validators[target_index]
+
     # Verify that source != target, so a consolidation cannot be used as an exit.
-    assert consolidation.source_index != consolidation.target_index
+    if source_index == target_index:
+        return
+
+    # Verify source withdrawal credentials
+    has_correct_credential = has_execution_withdrawal_credential(source_validator)
+    is_correct_source_address = (
+        source_validator.withdrawal_credentials[12:] == execution_layer_consolidation_request.source_address
+    )
+    if not (has_correct_credential and is_correct_source_address):
+        return
+
+    # Verify that target has execution withdrawal credentials
+    if not has_execution_withdrawal_credential(target_validator):
+        return
 
-    source_validator = state.validators[consolidation.source_index]
-    target_validator = state.validators[consolidation.target_index]
     # Verify the source and the target are active
     current_epoch = get_current_epoch(state)
-    assert is_active_validator(source_validator, current_epoch)
-    assert is_active_validator(target_validator, current_epoch)
+    if not is_active_validator(source_validator, current_epoch):
+        return
+    if not is_active_validator(target_validator, current_epoch):
+        return
     # Verify exits for source and target have not been initiated
-    assert source_validator.exit_epoch == FAR_FUTURE_EPOCH
-    assert target_validator.exit_epoch == FAR_FUTURE_EPOCH
-    # Consolidations must specify an epoch when they become valid; they are not valid before then
-    assert current_epoch >= consolidation.epoch
-
-    # Verify the source and the target have Execution layer withdrawal credentials
-    assert has_execution_withdrawal_credential(source_validator)
-    assert has_execution_withdrawal_credential(target_validator)
-    # Verify the same withdrawal address
-    assert source_validator.withdrawal_credentials[12:] == target_validator.withdrawal_credentials[12:]
-
-    # Verify consolidation is signed by the source and the target
-    domain = compute_domain(DOMAIN_CONSOLIDATION, genesis_validators_root=state.genesis_validators_root)
-    signing_root = compute_signing_root(consolidation, domain)
-    pubkeys = [source_validator.pubkey, target_validator.pubkey]
-    assert bls.FastAggregateVerify(pubkeys, signing_root, signed_consolidation.signature)
+    if source_validator.exit_epoch != FAR_FUTURE_EPOCH:
+        return
+    if target_validator.exit_epoch != FAR_FUTURE_EPOCH:
+        return
 
     # Initiate source validator exit and append pending consolidation
     source_validator.exit_epoch = compute_consolidation_epoch_and_update_churn(
@@ -1338,8 +1350,8 @@ def process_consolidation(state: BeaconState, signed_consolidation: SignedConsol
         source_validator.exit_epoch + MIN_VALIDATOR_WITHDRAWABILITY_DELAY
     )
     state.pending_consolidations.append(PendingConsolidation(
-        source_index=consolidation.source_index,
-        target_index=consolidation.target_index
+        source_index=source_index,
+        target_index=target_index
     ))
 ```
 

specs/electra/fork.md

@@ -91,7 +91,8 @@ def upgrade_to_electra(pre: deneb.BeaconState) -> BeaconState:
         blob_gas_used=pre.latest_execution_payload_header.blob_gas_used,
         excess_blob_gas=pre.latest_execution_payload_header.excess_blob_gas,
         deposit_receipts_root=Root(),  # [New in Electra:EIP6110]
-        withdrawal_requests_root=Root(),  # [New in Electra:EIP7002],
+        withdrawal_requests_root=Root(),  # [New in Electra:EIP7002]
+        consolidation_requests_root=Root(),  # [New in Electra:EIP7251]
     )
 
     exit_epochs = [v.exit_epoch for v in pre.validators if v.exit_epoch != FAR_FUTURE_EPOCH]