CCEF3 Jitsuin — あなたが人間であることの証明

The Problem

90% of online content may be AI-generated by 2026

↓ Trust in digital work is eroding faster than ever

? How do you know the person you're hiring is real?

AI can write your article, paint your portrait, compose your score, and answer your email. It does so in seconds, at scale, with no trace of humanity.

When everything can be faked, the most valuable thing you can offer is proof that you are real — that your work is yours, your intent is human, and your word can be trusted.

How do you prove that?

How It Works

Five steps to a seal that is yours for life.

一

Verify who you are

Choose your level of verification — email, phone, postal address, or government ID. You decide how much to share. We keep nothing beyond what's needed to confirm you're real.

二

Receive your unique seal

A composition of Japanese kanji characters — beautiful, memorable, and mathematically unique to you — backed by a SHA-256 hash. No two seals are alike.

愛笑信 0x4A9B

三

Two forms, every context

Your seal comes in two versions — colour on transparent for dark backgrounds, white on colour for light ones. Ready to be applied to any document, video, image, or audio file.

愛笑

四

Seal each new work

Each document gets its own Jitsuin — a unique seal generated for that specific file. The seal is tied to the document's hash, so any tampering breaks the chain.

五

Anyone can verify

Recipients see your seal and can verify it instantly — no account needed. They know your work was made by a verified human, at that trust level, at that moment in time.

Verification Levels

You decide what to share.
They decide what they need.

Trust is a spectrum. Jitsuin maps it with precision.

壱

Email

Basic presence. Enough for forums, comments, casual collaboration.

Low friction

弐

Phone

A real number, a real person. Suitable for professional correspondence.

Moderate trust

参

Postal Address

You exist in the physical world. Strong for contracts and freelance work.

High trust

肆

Government ID

The highest standard. For legal documents, high-stakes agreements, and trusted partnerships.

Maximum trust

Privacy is absolute. Your personal data is never stored, never sold, never shared. The seal proves you passed verification — nothing more.

Your Seal

Beautiful by design.
Unbreakable by mathematics.

Colour on transparent — for dark contexts

White on colour — for light contexts

57 AD

Today

Not a new idea. A 2,000-year-old one.

The first recorded use of a Japanese personal seal dates to 57 AD — a gold seal granted by the Han Emperor to a Japanese envoy, now held in Fukuoka. For nearly two millennia, the jitsuin has been Japan's most trusted instrument of identity: impossible to forge, legally binding, and deeply personal.

This is not a clever new technology looking for trust. It is a system that already has a 2,000-year chain of trust — one that predates every digital protocol, every blockchain, every cryptographic standard. We have simply given it the permanence of mathematics.

Tried. Tested. Now immutable.

The characters speak

愛 Ai Love · Care

笑 Emi Smile · Humanity

信 Shin Trust · Faith

知 Chi Knowledge · Wisdom

和 Wa Harmony · Peace

夢 Yume Dream · Vision

Each seal is a unique composition. The kanji are not chosen at random — they are mapped deterministically from your identity hash, so your seal is always recoverable, always yours.

The anatomy of a Jitsuin

Every Jitsuin contains three verifiable parts.

SOA

Source of Authority

Who issued the Jitsuin. The certifying entity whose verification you passed — anchoring the seal to a trusted root.

HITO

Person （人）

The individual to whom the Jitsuin was issued. Not your name, not your data — just the cryptographic proof that you passed verification.

DATE

Date of Issue

When the Jitsuin was issued. The older the seal, the longer the chain of trust behind it. Time itself becomes a measure of credibility.

Chain of Trust

Your reputation, built over time.

Every seal you apply, every collaboration you complete, adds a link to your chain of trust. Shareable. Verifiable. Entirely yours.

壱

Identity
Verified

弐

First
Document

参

Collaboration
Complete

肆

Next
Opportunity

伍

Your
Legacy

When you work with someone new, share your chain. They can see your history of verified work — not your identity, just your trustworthiness.

The humans decide the opportunities. We just provide the proof.

Learn about our opportunities platform →

Pricing Philosophy

One identity. For life.

We don't believe in subscriptions for something as fundamental as proof of who you are.

Foundation

丸

Your Identity on the Chain

$ 25 once, forever

A single one-time fee places your verified identity permanently on the chain. This is your root — the foundation everything else is built upon.

Identity verification & chain registration
50 document seals included free
Both seal formats (colour + white)
Shareable trust chain from day one
Add trust seal batches at purchase

Claim your identity

壱

Additional Seal Batches

$ 10 per 100 seals

Buy in batches of 100. Add them at purchase or any time after. Pay only for what you use — no subscription, no monthly fee, no lock-in.

100 unique document seals per batch
Add multiple batches at once
Never expire
Same verification, same quality

See all options

Physical

印

Physical Jitsuin

$ 100 shipped worldwide

A beautifully crafted physical seal — yours to use with ink on paper contracts. Paired with your digital identity so physical and digital signatures are one and the same.

Hand-crafted physical stamp
Linked to your digital chain
Use on paper contracts
Ships anywhere in the world

Order your seal

Your identity is not a service to be rented. It is something you own. Jitsuin is built on that belief — a one-time registration, a seal that grows with your work, and a chain of trust that belongs only to you.

Full pricing details →

Proof that you are human.