BNK Busan Bank completes won stablecoin trial on Kaia blockchain

BNK Busan Bank has completed a proof-of-concept for a won-backed stablecoin payment platform on the Kaia blockchain, one of South Korea’s most comprehensive banking trials of its kind, as the country’s stablecoin legislation remains stalled in parliament.

BNK Busan Bank, in partnership with AhnLab Blockchain Company and three other technology firms, has successfully completed a proof-of-concept for a blockchain-powered payment and settlement platform on the Kaia blockchain. The project covered the entire lifecycle of a digital currency—from issuance and circulation to payment and settlement—providing one of the country’s most comprehensive banking trials involving a won-backed stablecoin.

The initiative arrives at a pivotal moment for South Korea’s digital asset industry, where financial institutions are increasingly developing blockchain infrastructure in anticipation of future legislation governing stablecoin issuance. Rather than waiting for lawmakers to finalize the rules, banks are building the technology today so they can move quickly once regulations are in place.

A full-scale trial demonstrates real-world digital currency capabilities

Unlike earlier blockchain experiments that focused on simple token transfers, the Busan pilot tested how a won-backed stablecoin could function throughout an entire payment ecosystem under real operational conditions.

The initiative was conducted through K-STAR, an alliance established to build infrastructure for Korean won-denominated stablecoins. The consortium brought together five organizations, each contributing specialized expertise. BNK Busan Bank developed the payment and settlement model for policy-based digital currency, while AhnLab Blockchain Company designed the wallet infrastructure and transaction architecture. OpenAsset managed stablecoin issuance and verified asset consistency, Kaia supplied the blockchain network, and Lambda256 oversaw node operations and transaction monitoring.

According to Kaia, the project successfully validated infrastructure for “KRW stablecoin digital local currencies,” proving that blockchain technology can support financial services at commercial banking standards.

The pilot evaluated every major operational process, including issuance, circulation, funding, payments, and settlement. By completing each stage successfully, participants demonstrated that blockchain-based financial systems are capable of supporting practical banking applications instead of remaining limited to experimental environments.

Programmable money unlocks new possibilities for digital payments

One of the most significant outcomes of the project was the successful implementation of programmable money, allowing digital currency to carry built-in rules that determine how, when, and where it can be spent.

Instead of functioning like ordinary digital tokens, the won-backed stablecoin could automatically enforce spending limits, geographical restrictions, expiration dates, and customized settlement conditions through smart contract programming.

These capabilities closely mirror South Korea’s existing public financial programs, where local governments distribute policy funds, regional vouchers, and economic stimulus payments that must be spent within designated locations or before specific deadlines.

Embedding such restrictions directly into the currency itself removes much of the manual oversight traditionally required to administer these programs. Governments and financial institutions could potentially automate compliance while reducing fraud and administrative costs.

Performance testing also delivered impressive technical results. Using BNK Busan Bank’s operational payment data, the consortium simulated four different operating conditions, including standard traffic, peak transaction loads, irregular activity, and continuous operations over a 24-hour period.

Across every scenario, the system achieved a 100% transaction success rate, with every payment completing in under one second.

The project further demonstrated a gas-fee sponsorship model, allowing end users to complete blockchain transactions without directly paying network fees. Real-time transaction monitoring was also successfully integrated into the system, an important feature for financial compliance and operational oversight.

“This project is meaningful in that it verified that a digital currency-based local currency service can operate stably even in a real environment,” said Lim Ju-young, head of AhnLab Blockchain Company.

Lim added that the partners intend to expand their collaboration into broader areas including stablecoins, digital assets, and cross-border settlement services.

South Korean banks are competing before regulations arrive

The BNK Busan Bank project reflects a wider trend across South Korea’s financial sector, where banks are investing heavily in blockchain infrastructure before the government finalizes stablecoin legislation.

In May 2026, KB Financial Group, parent company of KB Kookmin Bank, completed its own Kaia blockchain pilot alongside KG Inicis and OpenAsset.

That earlier project demonstrated QR-code retail payments at Hollys Coffee while also completing a cross-border remittance to Vietnam by converting a Korean won stablecoin into a U.S. dollar stablecoin. According to the participating companies, the international transfer finished in under three minutes while reducing transaction costs by approximately 87% compared with traditional transfers conducted through the SWIFT network.

Both projects highlight Kaia’s growing position within South Korea’s blockchain ecosystem. The Ethereum Virtual Machine-compatible Layer-1 network was created through the merger of Kakao’s Klaytn blockchain and LINE’s Finschia network, giving it strong backing from two of Asia’s largest technology companies.

The increasing number of successful banking pilots suggests that financial institutions are positioning themselves early to secure future market share in digital payments, wallet services, settlement infrastructure, and international remittances.

Regulatory uncertainty remains the biggest hurdle

Despite rapid technological progress, commercial deployment of any won-backed stablecoin ultimately depends on South Korea completing its legal framework for stablecoin issuance.

The country’s proposed Digital Asset Basic Act remains stalled amid disagreements between the Bank of Korea and the Financial Services Commission over which institution should supervise and authorize stablecoin issuance.

That uncertainty has not slowed investment from the banking sector. Instead, financial groups appear determined to ensure their technology is deployment-ready by the time regulations take effect.

BNK Busan Bank said it plans to expand the platform beyond payments into digital policy funds, government vouchers, potential central bank digital currency applications, and broader won-backed stablecoin services.

For now, however, these innovations remain confined to pilot programs. Whether consumers eventually gain access to these blockchain-powered financial services will largely depend on how quickly Seoul resolves the regulatory debate and establishes a clear legal pathway for banks to issue and operate a won-backed stablecoin at scale.