For the past two decades, the smartphone has become the central interface of digital life.

Communication, identity, payments, and personal data have all been consolidated into a single device.
This concentration created convenience—but it also created a structural problem.

Too much responsibility now sits inside one object.

If the smartphone is lost, compromised, or simply unavailable, an entire layer of social function collapses with it.
Authentication, payment authorization, and personal identity verification are all tied to the same device.

This proposal begins from a simple observation:

The problem is not the smartphone itself.
The problem is the architecture of responsibility surrounding it.

Rather than replacing the smartphone, we can redesign the system so that responsibility is distributed across multiple layers.

This document proposes a national trust infrastructure based on three distinct roles:

Execution — a device that performs transactions

Authentication — a device that continuously verifies identity

Confirmation — an interface that makes consent visible

These roles are represented conceptually by a three-layer architecture:

Ring — Watch — Glass

The proposal was originally written as a policy paper for Japan’s Digital Agency.
However, the question it addresses extends beyond any single country.

As AI systems become embedded in everyday infrastructure, the architecture of trust will become a central public concern.

What matters is not only security or efficiency, but the clarity of who holds responsibility, and where that responsibility resides in the system.

This document explores how a distributed responsibility model could form the foundation of a new trust infrastructure for the digital society.