The Fuel of the Harmonic Trinity. SFD is the fungible privacy token that powers shielded transfers and the ascension burn that upgrades ForgeMiner tiers, with a 200B lifetime supply cap.
Live application state and user actions are enforced by the Express service and its PostgreSQL database. The Solidity contracts deployed to Sepolia are reference implementations, not the live runtime execution path.
ZKP-216 SFD has a lifetime supply cap of 200 billion tokens, matching the MINT_CAP in the deployed Sepolia reference contract. A single mint operation is capped at 1 billion SFD. The minting path is atomic: a database transaction locks the account row, enforces the per-mint and lifetime caps in-lock, and uses a SQL delta to update global supply — preventing lost-update races between concurrent first-mint operations and global supply drift.
SFD supports both public transfers (balance changes recorded transparently in the ledger) and shielded transfers verified by real Groth16 zk-SNARK proofs on the BN254 curve with Poseidon hashing. Shielded transfers conceal amounts and counterparty details from the public while the proof confirms the validity of the state transition. The ZK proof explorer surfaces minimal public metadata — proof existence and timestamps — without revealing raw proof artifacts or shielded amounts.
The Ascension Burn is the primary SFD sink. Burning SFD upgrades a ForgeMinerNFT tier: Tier 3→6 requires 21,600,000 SFD, Tier 6→9 requires 216,000,000 SFD, and Tier 3→9 direct costs 237,600,000 SFD. These amounts are exact parity with HarmonicAscension.sol — there is no resonance discount and no treasury redirect. Resonance (ZKP-432) gates Tier-9 eligibility only; it does not reduce the burn cost.
The 200 billion SFD supply is divided across five allocation buckets: Mining and Proof Rewards (110B), Presale (70B), Community and Ecosystem (8B), Liquidity (6B), and Team and Advisors (6B). Emissions are epoch-aware; the Tokenomics dashboard shows the current epoch, per-bucket allocations, and treasury fee routing in real time.