Summary
South Korea's Project Hangang deposit-token system, now being extended to merchant checkouts via a ₩9.6B Toss Payments contract, addresses the two problems that have consistently stalled CBDC adoption globally: the monetary-system design problem (ensuring singleness of money) and the adoption-friction problem (merchant terminal replacement). The architecture uses a burn-and-issue protocol for atomic interbank settlement and backward-compatible POS integration through existing payment gateways.
Key Points
- Deposit tokens vs stablecoins vs retail CBDC: Deposit tokens are blockchain-based representations of bank deposits. The liability stays on the issuing bank's balance sheet, covered by deposit insurance. This differs from stablecoins (claims on the issuer) and retail CBDC (central bank issues directly to public).
- Burn-and-issue protocol: When Bank A's customer pays Bank B's merchant: (1) Bank A's deposit tokens are burned, (2) wholesale CBDC transfers between banks on the DCS (Bank of Korea's permissioned Hyperledger Besu ledger), (3) Bank B reissues deposit tokens to merchant. All three steps execute atomically — no partial settlement, no counterparty risk.
- Backward compatibility: Merchants don't replace POS terminals. Toss Payments bridges deposit-token wallet transactions to existing payment rails. Eight payment gateways in consortium ensure broad coverage.
- BOK-Wire+ gap: DCS operates 24/7; legacy BOK-Wire+ operates weekdays 9am-8pm. Reconciliation via encrypted USB media with daily 3pm snapshots. Governor acknowledges this as "transitional."
- Phase 1 (2025): 7 banks, ~12,000 merchants, 114,880 transactions, ₩692M volume. Modest but confirmed technical reliability.
- Phase 2 (2026): 9 banks, up to 500,000 users, biometric approvals, P2P transfers, programmable government disbursements (EV charging subsidies via smart contracts). Large-scale transactions targeting September.
- Global context: Only 3 countries have launched retail CBDC (Bahamas, Nigeria, Jamaica). China's e-CNY is largest pilot (3.4B+ transactions). South Korea's approach is architecturally distinct — the first major attempt to validate the BIS "unified ledger" blueprint at the civilian POS layer.