Architecture overview - Fuego

Fuego is a C++17 CryptoNote-based blockchain with significant extensions for commitment deposits, adaptor-signature atomic swaps, and zero-knowledge proofs.

Core components

Component	Path	Description
Blockchain	`src/CryptoNoteCore/Blockchain.cpp`	Consensus, fee pool, epoch accounting
CommitmentIndex	`src/CryptoNoteCore/CommitmentIndex.*`	CD state tracking, epoch reports
Currency	`src/CryptoNoteCore/Currency.*`	`calculateCdInterest()`, network parameters
WalletGreen	`src/Wallet/WalletGreen.*`	Wallet operations, deposit management
RpcServer	`src/Rpc/RpcServer.*`	HTTP JSON-RPC endpoints
SwapDaemon	`src/SwapDaemon/`	Adaptor-signature swap state machine
AliasIndex	`src/CryptoNoteCore/AliasIndex.*`	On-chain alias registry

Transaction types

Fuego extends CryptoNote with custom transaction inputs and outputs:

Type	Tag	Description
`TransactionOutputCommitment`	—	Creates a CD or burn deposit
`TransactionInputCommitmentSpend`	0x7	Spends a mature CD (with `claimedInterest`)
`TransactionInputCommitmentTransfer`	0x8	Transfers a CD before maturity

See include/CryptoNote.h for full struct definitions.

Fee pool mechanics (live constants)

XFG-side atomic swaps charge 1% (SWAP_FEE_RATE_BPS); epoch split 69% CD / 11% Bonus Vault / 20% Treasury
Hearth trades charge 1% (HEARTH_FEE_BPS); 100% → CD yield (LPs earn the swap spread)
At epoch boundaries (EPOCH_DURATION_BLOCKS = 900 mainnet), fee accounting advances for HEAT CDs
Product path: burn XFG → mint HEAT (mintHeatV10) → lock HEAT as CD — see dual-asset architecture

Internal design notes also exist under the monorepo docs/ tree (implementation plans, zkLP research) but are not published as Mintlify pages.