Arqma Network – Master Branch Update: Hard Fork 19 (HF 19)
February 2026
OverviewThe Arqma development team announces a significant update to the master branch, bringing 32 commits that introduce Hard Fork 19 (HF 19) and related improvements. This update includes important protocol changes, security enhancements, and compatibility updates across the codebase.
Hard Fork 19 (HF 19) FeaturesCLSAG (Compact Linkable Spontaneous Anonymous Group)• New ring signature algorithm replacing the previous MLSAG scheme
• Reduces transaction size and improves verification performance
• Maintains privacy and security guarantees
Atomic Swap Support• Protocol-level support for atomic swaps
• Enables trustless exchange between ARQ and other compatible cryptocurrencies
Fee Burning• Implementation of fee burning mechanism
• A portion of transaction fees is permanently removed from circulation
RPC API Changes•
transfer_details response now includes
block_height field
• Improves wallet and explorer integration
Technical ImprovementsSecurity & Compatibility• OpenSSL 3.0 compatibility – deprecated function warnings suppressed in net_ssl.cpp
• Ensures continued operation with modern OpenSSL versions
Dependencies• ZeroMQ/cppzmq updated to latest version with new API migration
• Boost 1.85+ ASIO definitions support
• AES key expansion optimization – no additional memory allocation
Build System• CMake configuration enhancements for warning suppression
• Improved code clarity and compiler compatibility
Bug Fixes• Wallet address_book fixes
• Transaction handling fixes
• Stage net seeds and configuration updates
Statistics• 32 commits merged
• 527 files changed
• 4,558 insertions, 2,277 deletions
Upgrade InstructionsUsers running nodes from source should update their local repository:
For tagged releases, please use the appropriate release branch (e.g.
v10.0.0) as indicated in the build documentation.
Links•
GitHub Repository•
Website•
Blockchain Explorer•
Telegram•
Discord•
Twitter
Arqma – Private, secure, untraceable, decentralised digital currency.