P4 Verification: Draft Technical Design Brief

Status: COMPLETED

Overview

P4 involved writing a comprehensive technical design brief that provides implementation-ready specifications for Milestone 2.

Verification Criteria

  • Problem statement with clear analysis
  • Scope definition with M2 targets and non-goals
  • Architecture overview with technical details
  • Detailed design specifications
  • Implementation roadmap and acceptance criteria

Implementation Status

Problem Statement

  • Current State: Clear analysis of why local EVMs fail for Arbitrum features
  • Root Causes: Precompile registry, transaction type support, gas model mismatch
  • Impact Assessment: Development cycle impacts quantified

Scope Definition (M2 Target)

  • Core Features: ArbSys and ArbGasInfo emulators, 0x7e transaction support
  • Packaging: Hardhat plugin and Anvil extension specifications
  • Non-Goals: Clear boundaries for M2 (retryables, Stylus, APGAS out of scope)

Architecture Overview

  • Precompile Registry: Address→handler mapping system
  • Handler Interface: Complete TypeScript interfaces with context handling
  • 0x7e Integration: Hardhat and Anvil integration points specified
  • Configuration: Chain ID overrides, fee mocks, CLI flags

Detailed Design

  • ArbSys Emulator: Supported functions, return value sources, error semantics
  • ArbGasInfo Emulator: Read-only functions, mock L1 cost strategy
  • Transaction Type 0x7e: Envelope fields, execution model, gas accounting
  • Error Handling: Developer UX strategy with actionable guidance
  • Testing Strategy: Unit tests, golden tests vs Arbitrum One

Evidence Files

  • docs/m1-design-brief.md - Lines 1-551: Complete technical design brief
  • All required sections present and comprehensive
  • Code examples in TypeScript and Rust provided

Test Results

Status: COMPLETED

  • Design brief covers all required sections
  • Implementation specifications are clear and actionable
  • Architecture decisions are well-documented

Issues Found

None - P4 implementation is comprehensive and implementation-ready

Verification Result

P4: COMPLETED - Complete technical design brief ready for M2 implementation

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