v4.0.0

🚀 Major Features

EIP-7702 Support

• feat: Add support for EIP-7702 (delegation transactions)
• Add comprehensive EIP-7702 serialization tests
• Update transaction schemas and validators

Bitcoin Enhancements

• feat: Add Bitcoin xpub support
• feat: Add x/y/zpub helper functions
• Fix address offset calculation
• Improve Bitcoin address derivation and validation

ESM Adoption

• feat: Adopt Pure ESM build with Vite 7 and Vitest 3
• Adopt ES modules for better tree-shaking and modern JavaScript compatibility
• Add module interoperability tests for both CJS and ESM

Viem Integration

• feat: Migrate from ethers.js to viem for Ethereum interactions
• Add viem signed transaction helper
• Improve EVM test compatibility with Lattice simulator
• Update transaction parsing and validation utilities

Documentation

• docs: Comprehensive v4.0.0 documentation update
• Add migration guide from v3 to v4
• Update signing documentation with new examples
• Enhance address documentation
• Improve calldata decoding tutorials

🐛 Bug Fixes

• fix: Correct address comparison in personal message signing
• fix: Fix address offset calculation
• fix: Fix issues with EIP-712 v parameter
• fix: Fix ESM imports for secp256k1
• fix: Fix parse derivation path
• fix: Fix issue with fetching addresses by derivation path
• fix: Fix types in ESM projects
• fix: Add istanbul code coverage and remove unreferenced transaction-parsing utils
• fix: Resolve all ESLint warnings

🔄 Refactoring

• refactor: Standardize test seed usage and remove deprecated test infrastructure
• Migrate from ethers.js to viem throughout codebase
• Update transaction parsing utilities
• Improve code organization and structure
• Remove unused imports and dead code

📊 Statistics

• 115 files changed
• 10,852 insertions(+), 5,907 deletions(-)
• Major version bump: v3.x.x → v4.0.0

⚠️ Breaking Changes

This release includes breaking changes. Please refer to the migration guide for details on upgrading from v3 to v4.

Key Breaking Changes:

• Migration from ethers.js to viem
• Updated API signatures for signing operations
• Changes to transaction parsing and validation

🔗 Related Issues & PRs

This release consolidates work from multiple PRs including:

• #686, #677, #669, #629, #651, #667, #642, #654, #659, #658, #657, #661, #662, #663, #665, #664, #645, #656, #655, #607, #614, #630, #628, #635, #647, #638, #648, #646, #644, #641, #631, #633, #636, #627, #640, #643, #626, #625, #624, #622, #620, #618, #617, #616, #615, #613, #610, #602, and more