FIX Core (Go)

Status: BETA | Protocol Compatibility: 100% with legacy C++ nodes

Modern Go implementation of the FIX cryptocurrency. Fully compatible with the existing FIX network — connects to the same peers, validates the same blocks, and works with the same wallets.

Differences from Legacy (C++) Version

	Legacy (C++)	Go (this)
Language	C++ (Qt)	Go
Database	LevelDB/BerkeleyDB	Pebble
Build	autotools, ~5 min	go build, seconds
Binary size	~30 MB + Qt deps	~15 MB, no deps
Config format	fix.conf (key=value)	fixd.yml (YAML) + legacy fix.conf support
Wallet GUI	Qt-based	Wails (web-based)
Memory usage	Higher	30-50% lower
Codebase	~575 files	~380 files

What stays the same:

• PoS consensus rules, stake modifiers, kernel hash validation
• P2P protocol (magic bytes, message formats, protocol version 70928)
• Masternode tiers (Bronze/Silver/Gold/Platinum)
• RPC interface compatibility
• Wallet migration from legacy wallet.dat (BerkeleyDB) — automatic on first start

Quick Start

Build

go build ./cmd/fixd       # daemon
go build ./cmd/fix-cli    # CLI client

Run

./fixd start > /dev/null 2>&1 &   # start daemon in background
./fix-cli getinfo                  # check status

Migrating from Legacy Wallet

If you have an existing FIX wallet from the C++ version, copy your wallet.dat to the Go daemon's data directory (~/.fix/).

On Linux both daemons use ~/.fix/ by default, so no copy is needed — just stop the old daemon and start the new one.

On macOS the legacy Qt wallet stores data in ~/Library/Application Support/FIX/:

# 1. Stop the legacy daemon
fix-cli stop

# 2. Copy wallet (macOS only — Linux uses the same dir)
cp ~/Library/Application\ Support/FIX/wallet.dat ~/.fix/wallet.dat

# 3. Start the Go daemon
./fixd start > /dev/null 2>&1 &

The Go daemon reads the legacy wallet.dat (BerkeleyDB) and migrates it to its own format on first start. Your balances, addresses, and keys will be available after migration.

Important: Always back up your wallet.dat before switching between daemon versions.

Configuration

The daemon uses ~/.fix/fixd.yml (YAML) as the primary config. Legacy fix.conf is also supported as fallback.

Priority: CLI flags > environment variables > fixd.yml > fix.conf > defaults

Requirements

• Go 1.25 or later

Protocol Compatibility

100% compatible with legacy C++ nodes:

• PoS difficulty: ppcoin-style per-block retargeting (blocks >400)
• Masternode broadcast: Dual-key structure with Hash160 signatures
• P2P protocol: Network magic 0x2f1cd30a, protocol version 70928
• No chain fork risk

License

MIT License - See COPYING for details.