TheVerge: spec draft

.gitignore

@@ -24,6 +24,7 @@ tests/core/pyspec/eth2spec/deneb/
 tests/core/pyspec/eth2spec/electra/
 tests/core/pyspec/eth2spec/whisk/
 tests/core/pyspec/eth2spec/eip7594/
+tests/core/pyspec/eth2spec/eip6800/
 
 # coverage reports
 .htmlcov

Makefile

@@ -35,7 +35,7 @@ MARKDOWN_FILES = $(wildcard $(SPEC_DIR)/*/*.md) \
                  $(wildcard $(SPEC_DIR)/_features/*/*/*.md) \
                  $(wildcard $(SSZ_DIR)/*.md)
 
-ALL_EXECUTABLE_SPEC_NAMES = phase0 altair bellatrix capella deneb electra whisk
+ALL_EXECUTABLE_SPEC_NAMES = phase0 altair bellatrix capella deneb electra whisk eip6800
 # The parameters for commands. Use `foreach` to avoid listing specs again.
 COVERAGE_SCOPE := $(foreach S,$(ALL_EXECUTABLE_SPEC_NAMES), --cov=eth2spec.$S.$(TEST_PRESET_TYPE))
 PYLINT_SCOPE := $(foreach S,$(ALL_EXECUTABLE_SPEC_NAMES), ./eth2spec/$S)

presets/mainnet/eip6800.yaml

@@ -0,0 +1,12 @@
+# Mainnet preset - EIP6800
+
+# Misc
+# ---------------------------------------------------------------
+# `uint64(2**16)` (= 65,536) 
+MAX_STEMS: 65536
+# `uint64(33)`
+MAX_COMMITMENTS_PER_STEM: 33
+# `uint64(2**8)` (= 256)
+VERKLE_WIDTH: 256
+# `uint64(2**3)` (= 8)
+IPA_PROOF_DEPTH: 8

presets/minimal/eip6800.yaml

@@ -0,0 +1,12 @@
+# Minimal preset - EIP6800
+
+# Execution
+# ---------------------------------------------------------------
+# `uint64(2**16)` (= 65,536) 
+MAX_STEMS: 65536
+# `uint64(33)`
+MAX_COMMITMENTS_PER_STEM: 33
+# `uint64(2**8)` (= 256)
+VERKLE_WIDTH: 256
+# `uint64(2**3)` (= 8)
+IPA_PROOF_DEPTH: 8

pysetup/constants.py

@@ -6,10 +6,10 @@
 DENEB = 'deneb'
 ELECTRA = 'electra'
 EIP7594 = 'eip7594'
+EIP6800 = 'eip6800'
 WHISK = 'whisk'
 
 
-
 # The helper functions that are used when defining constants
 CONSTANT_DEP_SUNDRY_CONSTANTS_FUNCTIONS = '''
 def ceillog2(x: int) -> uint64:

pysetup/helpers.py

@@ -178,7 +178,7 @@ def combine_dicts(old_dict: Dict[str, T], new_dict: Dict[str, T]) -> Dict[str, T
 
 ignored_dependencies = [
     'bit', 'boolean', 'Vector', 'List', 'Container', 'BLSPubkey', 'BLSSignature',
-    'Bytes1', 'Bytes4', 'Bytes8', 'Bytes20', 'Bytes32', 'Bytes48', 'Bytes96', 'Bitlist', 'Bitvector',
+    'Bytes1', 'Bytes4', 'Bytes8', 'Bytes20', 'Bytes31', 'Bytes32', 'Bytes48', 'Bytes96', 'Bitlist', 'Bitvector',
     'uint8', 'uint16', 'uint32', 'uint64', 'uint128', 'uint256',
     'bytes', 'byte', 'ByteList', 'ByteVector',
     'Dict', 'dict', 'field', 'ceillog2', 'floorlog2', 'Set',

pysetup/md_doc_paths.py

@@ -9,6 +9,7 @@
     ELECTRA,
     WHISK,
     EIP7594,
+    EIP6800,
 )
 
 
@@ -21,6 +22,7 @@
     ELECTRA: DENEB,
     WHISK: CAPELLA,
     EIP7594: DENEB,
+    EIP6800: DENEB,
 }
 
 ALL_FORKS = list(PREVIOUS_FORK_OF.keys())

pysetup/spec_builders/__init__.py

@@ -6,12 +6,13 @@
 from .electra import ElectraSpecBuilder
 from .whisk import WhiskSpecBuilder
 from .eip7594 import EIP7594SpecBuilder
+from .eip6800 import EIP6800SpecBuilder
 
 
 spec_builders = {
     builder.fork: builder
     for builder in (
         Phase0SpecBuilder, AltairSpecBuilder, BellatrixSpecBuilder, CapellaSpecBuilder, DenebSpecBuilder,
-        ElectraSpecBuilder, WhiskSpecBuilder, EIP7594SpecBuilder,
+        ElectraSpecBuilder, WhiskSpecBuilder, EIP7594SpecBuilder, EIP6800SpecBuilder,
     )
 }

pysetup/spec_builders/eip6800.py

@@ -0,0 +1,21 @@
+from typing import Dict
+
+from .base import BaseSpecBuilder
+from ..constants import EIP6800
+
+
+class EIP6800SpecBuilder(BaseSpecBuilder):
+    fork: str = EIP6800
+
+    @classmethod
+    def imports(cls, preset_name: str):
+        return f'''
+from eth2spec.deneb import {preset_name} as deneb
+from eth2spec.utils.ssz.ssz_typing import Bytes31
+'''
+
+    @classmethod
+    def hardcoded_custom_type_dep_constants(cls, spec_object) -> str:
+        return {
+            'MAX_STEMS': spec_object.preset_vars['MAX_STEMS'].value,
+        }

setup.py

@@ -219,7 +219,13 @@ def get_spec(file_name: Path, preset: Dict[str, str], config: Dict[str, str], pr
             elif source.startswith("class"):
                 class_name, parent_class = _get_class_info_from_source(source)
                 # check consistency with spec
-                assert class_name == current_name
+                try:
+                    assert class_name == current_name
+                except Exception:
+                    print('class_name', class_name)
+                    print('current_name', current_name)
+                    raise
+
                 if parent_class:
                     assert parent_class == "Container"
                 # NOTE: trim whitespace from spec

specs/_features/eip6800/beacon-chain.md

@@ -0,0 +1,221 @@
+# EIP6800 -- The Beacon Chain
+
+## Table of contents
+
+<!-- TOC -->
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+- [Introduction](#introduction)
+- [Custom types](#custom-types)
+- [Preset](#preset)
+  - [Execution](#execution)
+- [Containers](#containers)
+  - [Extended containers](#extended-containers)
+    - [`ExecutionPayload`](#executionpayload)
+    - [`ExecutionPayloadHeader`](#executionpayloadheader)
+  - [New containers](#new-containers)
+    - [`SuffixStateDiff`](#suffixstatediff)
+    - [`StemStateDiff`](#stemstatediff)
+    - [`IPAProof`](#ipaproof)
+    - [`VerkleProof`](#verkleproof)
+    - [`ExecutionWitness`](#executionwitness)
+- [Beacon chain state transition function](#beacon-chain-state-transition-function)
+  - [Block processing](#block-processing)
+    - [Execution payload](#execution-payload)
+      - [`process_execution_payload`](#process_execution_payload)
+- [Testing](#testing)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+<!-- /TOC -->
+
+## Introduction
+
+This upgrade adds transaction execution to the beacon chain as part of the eip6800 upgrade.
+
+## Custom types
+
+| Name | SSZ equivalent | Description |
+| - | - | - |
+| `BanderwagonGroupElement` | `Bytes32` | |
+| `BanderwagonFieldElement` | `Bytes32` | |
+| `Stem` | `Bytes31` | |
+
+## Preset
+
+### Execution
+
+| Name | Value |
+| - | - |
+| `MAX_STEMS` | `uint64(2**16)` (= 65,536) |
+| `MAX_COMMITMENTS_PER_STEM` | `uint64(33)` |
+| `VERKLE_WIDTH` | `uint64(2**8)` (= 256) |
+| `IPA_PROOF_DEPTH` | `uint64(2**3)` (= 8) |
+
+## Containers
+
+### Extended containers
+
+#### `ExecutionPayload`
+
+```python
+class ExecutionPayload(Container):
+    # Execution block header fields
+    parent_hash: Hash32
+    fee_recipient: ExecutionAddress  # 'beneficiary' in the yellow paper
+    state_root: Bytes32
+    receipts_root: Bytes32
+    logs_bloom: ByteVector[BYTES_PER_LOGS_BLOOM]
+    prev_randao: Bytes32  # 'difficulty' in the yellow paper
+    block_number: uint64  # 'number' in the yellow paper
+    gas_limit: uint64
+    gas_used: uint64
+    timestamp: uint64
+    extra_data: ByteList[MAX_EXTRA_DATA_BYTES]
+    base_fee_per_gas: uint256
+    # Extra payload fields
+    block_hash: Hash32  # Hash of execution block
+    transactions: List[Transaction, MAX_TRANSACTIONS_PER_PAYLOAD]
+    withdrawals: List[Withdrawal, MAX_WITHDRAWALS_PER_PAYLOAD]
+    blob_gas_used: uint64
+    excess_blob_gas: uint64
+    execution_witness: ExecutionWitness  # [New in EIP6800]
+```
+
+#### `ExecutionPayloadHeader`
+
+```python
+class ExecutionPayloadHeader(Container):
+    # Execution block header fields
+    parent_hash: Hash32
+    fee_recipient: ExecutionAddress
+    state_root: Bytes32
+    receipts_root: Bytes32
+    logs_bloom: ByteVector[BYTES_PER_LOGS_BLOOM]
+    prev_randao: Bytes32
+    block_number: uint64
+    gas_limit: uint64
+    gas_used: uint64
+    timestamp: uint64
+    extra_data: ByteList[MAX_EXTRA_DATA_BYTES]
+    base_fee_per_gas: uint256
+    # Extra payload fields
+    block_hash: Hash32  # Hash of execution block
+    transactions_root: Root
+    withdrawals_root: Root
+    blob_gas_used: uint64
+    excess_data_gas: uint64
+    execution_witness_root: Root  # [New in EIP6800]
+```
+
+### New containers
+
+#### `SuffixStateDiff`
+
+```python
+class SuffixStateDiff(Container):
+    suffix: Bytes1
+    # Null means not currently present
+    current_value: Optional[Bytes32]
+    # Null means value not updated
+    new_value: Optional[Bytes32]
+```
+
+*Note*: on the Kaustinen testnet, `new_value` is omitted from the container.
+
+#### `StemStateDiff`
+
+```python
+class StemStateDiff(Container):
+    stem: Stem
+    # Valid only if list is sorted by suffixes
+    suffix_diffs: List[SuffixStateDiff, VERKLE_WIDTH]
+```
+
+#### `IPAProof`
+
+```python
+class IPAProof(Container):
+    cl: Vector[BanderwagonGroupElement, IPA_PROOF_DEPTH]
+    cr: Vector[BanderwagonGroupElement, IPA_PROOF_DEPTH]
+    final_evaluation = BanderwagonFieldElement
+```
+
+#### `VerkleProof`
+
+```python
+class VerkleProof(Container):
+    other_stems: List[Bytes31, MAX_STEMS]
+    depth_extension_present: ByteList[MAX_STEMS]
+    commitments_by_path: List[BanderwagonGroupElement, MAX_STEMS * MAX_COMMITMENTS_PER_STEM]
+    d: BanderwagonGroupElement
+    ipa_proof: IPAProof
+```
+
+#### `ExecutionWitness`
+
+```python
+class ExecutionWitness(Container):
+    state_diff: List[StemStateDiff, MAX_STEMS]
+    verkle_proof: VerkleProof
+```
+
+## Beacon chain state transition function
+
+### Block processing
+
+#### Execution payload
+
+##### `process_execution_payload`
+
+```python
+def process_execution_payload(state: BeaconState, body: BeaconBlockBody, execution_engine: ExecutionEngine) -> None:
+    payload = body.execution_payload
+
+    # Verify consistency of the parent hash with respect to the previous execution payload header
+    assert payload.parent_hash == state.latest_execution_payload_header.block_hash
+    # Verify prev_randao
+    assert payload.prev_randao == get_randao_mix(state, get_current_epoch(state))
+    # Verify timestamp
+    assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
+
+    # Verify commitments are under limit
+    assert len(body.blob_kzg_commitments) <= MAX_BLOBS_PER_BLOCK
+
+    # Verify the execution payload is valid
+    # Pass `versioned_hashes` to Execution Engine
+    # Pass `parent_beacon_block_root` to Execution Engine
+    versioned_hashes = [kzg_commitment_to_versioned_hash(commitment) for commitment in body.blob_kzg_commitments]
+    assert execution_engine.verify_and_notify_new_payload(
+        NewPayloadRequest(
+            execution_payload=payload,
+            versioned_hashes=versioned_hashes,
+            parent_beacon_block_root=state.latest_block_header.parent_root,
+        )
+    )
+
+    # Cache execution payload header
+    state.latest_execution_payload_header = ExecutionPayloadHeader(
+        parent_hash=payload.parent_hash,
+        fee_recipient=payload.fee_recipient,
+        state_root=payload.state_root,
+        receipts_root=payload.receipts_root,
+        logs_bloom=payload.logs_bloom,
+        prev_randao=payload.prev_randao,
+        block_number=payload.block_number,
+        gas_limit=payload.gas_limit,
+        gas_used=payload.gas_used,
+        timestamp=payload.timestamp,
+        extra_data=payload.extra_data,
+        base_fee_per_gas=payload.base_fee_per_gas,
+        block_hash=payload.block_hash,
+        transactions_root=hash_tree_root(payload.transactions),
+        withdrawals_root=hash_tree_root(payload.withdrawals),
+        excess_data_gas=payload.excess_data_gas,
+        execution_witness=payload.execution_witness,  # [New in EIP6800]
+    )
+```
+
+## Testing
+
+TBD