Created test_signing.go to test MPC signing functionality:
- Generates JWT token for authentication
- Creates SHA-256 hash of test message
- Calls POST /api/v1/mpc/sign API
- Tests signing with persistent parties (non-delegate mode)
Usage: go run test_signing.go
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
