v0.3.6 - ADR-036 Protobuf Signing Support

Key Additions

• ADR-036 Arbitrary Signing Support

  • Implemented MsgSignData-based signing aligned with ADR-036
  • Added experimentalAdr36Sign and experimentalAdr36Verify methods
  • Supports verification of ADR-036 signatures for arbitrary data
  • Uses standard signing context: accountNumber=0, sequence=0, chainId=""

• New Protobuf-Based Signing Client

  • Introduced SigningProtobufStargateClient for Protobuf-native transaction signing
  • Directly utilizes types from cosmjs-types
  • Improves integration with modern Cosmos SDK chains and signature tooling

Signing Architecture Refactor

• Refactored existing SigningStargateClient to use Protobuf-based logic
• Updated FirmaUtil signing utilities to support new Protobuf workflows
• Introduced new interfaces in TxCommon.ts for structured Protobuf signing
• Enhanced type safety across signing methods with clearer TypeScript contracts
• Improved error handling and input validation throughout the signing process

Integration Testing

• Fully tested against Firma Station Web and Firma Station Mobile
  • ✅ Arbitrary data signing and verification (ADR-036)
  • ✅ Transaction signing and broadcasting
  • ✅ QR Code-based signing
  • ✅ Signature verification workflows
• All features confirmed to work across supported platforms

What's Changed

• feat: Implement ADR-036 Protobuf signing and improve signing architecture by @thismars in #16
• Update package-lock.json & tsconfig.json by @thismars in #17

Full Changelog: v0.3.5...v0.3.6