How NHN KCP is rebuilding Korea's $38 billion payment backbone.

Settlement was the bug.

Every completed sale at a Korean merchant spent up to three days in transit before the merchant could touch the cash. That is working capital held hostage by infrastructure, at national scale. NHN KCP, which processes the largest share of Korea's e-commerce payment volume, set out to make the delay disappear rather than manage it. Payment Chain settles in under a second. Merchants receive KRW or stablecoins on the same rail, and finality is deterministic: a payment is final the moment it confirms, so reconciliation stops being a department's whole job.

Two paths onchain. Nothing gets ripped out.

The architecture maps the complete payment lifecycle across two models. A streamlined seven-step flow handles direct blockchain payments: a customer scans a QR code, the wallet system verifies balance and validity, the transaction writes onchain, and settlement follows, with a single payment ID linking the offchain and onchain legs end to end. A twelve-step flow integrates the chain with NHN KCP's existing PG network, which keeps handling order management, approval windows, and merchant notifications while the blockchain takes over validity checks, transaction writes, and final settlement. The existing network keeps doing what it does well. The chain replaces only the part that was broken. For an institution whose infrastructure runs half a country's card processing, coexistence was the requirement that made the project possible.

Encryption by classification, visible by permission.

Every step in both flows carries a defined encryption requirement. Sender, receiver, token, amount, and payment ID are classified high-sensitivity and encrypted directly onchain through Encrypted ERC. Transaction status and event logs carry a lighter tier. View keys and audit keys govern access: counterparties see their own transactions, auditors and regulators see what their mandate entitles them to, and the public sees nothing. Privacy on Payment Chain is a data policy enforced by the protocol, designed to meet the encryption standards a Korean payment processor already answers to.

Two products, one platform.

Payment Chain is NHN KCP's own mainnet, Korea's first payment-dedicated chain. Payment Chain as a Service is the business model built on top of it: brands, convenience store chains, loyalty programs, and shopping platforms can run their own dedicated payment and settlement networks, tiered from white-label wallets to dedicated tokens to full brand-dedicated mainnets, with NHN KCP operating the infrastructure. Loyalty and point assets connect to onchain tokens that move outside closed membership systems. The 500,000 merchants already in NHN KCP's footprint become the distribution channel, and payment infrastructure becomes a recurring product line instead of a cost center.

Why AvaCloud.

The evaluation came down to operational maturity and the encryption stack. A payment backbone answers to financial-services SLAs, and AvaCloud's managed infrastructure, monitoring, and incident response matched what NHN KCP already requires of every other system it runs. Encrypted ERC met the company's data classification policies natively. And the dedicated L1 model meant capacity planned for Korean commerce, with no one else's traffic in the queue.