3. Guiding Principles
MIZUHIKI's design reflects four principles. Each principle has been chosen because it responds to a specific constraint in the Japanese operating environment, and because it is additive: a chain can satisfy any one of the principles on its own, but the four principles together produce a qualitatively different infrastructure from any that presently exists.
3.1 Sovereignty
The Principle of Sovereignty states that MIZUHIKI operates within the control of Japan and beyond the influence of outside regulatory and geopolitical forces. Every validator node is located onshore in Japan and operated by an approved entity. All infrastructure for the MIZUHIKI Foundation and for AltX Research K.K. is registered in Japan. Data residency for core protocol operations is onshore. To the greatest extent practicable in a public, Internet-reachable blockchain, MIZUHIKI responds to Japanese law and Japanese supervision alone.
For every system-critical component of the MIZUHIKI network, there is a natural person or legal entity within Japanese jurisdiction who can be identified, communicated with, and, if necessary, held to account. This is a substantive property, not a symbolic one, and it is the basis on which Japanese regulated institutions can build critical services on-chain with confidence.
3.2 Security
The Principle of Security states that MIZUHIKI provides the quality of security users expect from a mature blockchain. MIZUHIKI is Ethereum-equivalent — a concept explained in detail in Section 4 — meaning that it inherits the continuing security improvements of the Ethereum research and engineering community, applies them under Japanese validator infrastructure, and does not fork the underlying client codebase in ways that would require independent security maintenance. Japan's engineering talent base is brought to bear at the infrastructure layer: validator operation, node hardening, and monitoring.
3.3 Safety
The Principle of Safety states that participants in regulated on-chain services on MIZUHIKI can transact with confidence that counterparties have been verified and that Japan's anti-money-laundering and anti-social-forces compliance policies have been embedded at the infrastructure layer. Safety, in MIZUHIKI's design, is not something that each application must implement from first principles. It is a shared property of the network, implemented through the MIZUHIKI Compliance Suite (Section 6) and Identity layer (Section 7), and available to applications as a primitive they can compose with.
3.4 Scalability
The Principle of Scalability states that MIZUHIKI is designed to meet the transaction needs of a growing user base, with performance characteristics appropriate for consumer payments. The chain targets sub-second deterministic finality, with fee levels low enough to support everyday retail use cases. Where vertical scaling meets its limits, MIZUHIKI can support Layer 2 frameworks that allow specialised execution environments to settle against MIZUHIKI while inheriting its sovereignty properties.
Scalability is not, in MIZUHIKI's view, an end in itself. A chain that can process high transaction volumes but cannot answer the sovereignty or compliance questions asked of it by Japanese regulators is of little use in this market. The principle is therefore stated last, and deliberately: MIZUHIKI is designed first to be sovereign, secure, and safe, and then to scale in service of those properties rather than at their expense.
The four principles are, in practice, a single commitment: that regulated Japanese economic activity can move onto public, programmable, composable infrastructure without sacrificing any of the properties that regulated activity depends on. The remainder of this whitepaper sets out the architecture that realises this commitment.