HORIZON SHIELD

TOshi Oga,
in his own words.

A carpenter of thirty years who taught himself AI and built an open construction-cost database. No titles. No salesmanship. Plain sentences from the site, the data, and a long argument with an industry that hides its prices.

Each line below is something he has said in public, in print, or in code. The sources are linked at the bottom.

Verify, don't trust. Open the dataset (JCCDB), check the Bitcoin block, read the papers. The man behind these sentences is verifiable. See the evidence.

I. On the right to know

Cheapest is not the same as fair.
安いだけではあかん。
by TOshi Oga

A person has the right to know whether their price is fair.
払う前に、それが適正か知る権利がある。
by TOshi Oga

The world is unfair, and too comfortable with it.
世の中は理不尽すぎる。そして無知を無知でよしとしてる。
by TOshi Oga

The weakest don't even know they have the right to change anything.
弱者は、変わる権利さえ知らない。
by TOshi Oga

Verify, don't trust.
信頼するな。検証しろ。
by TOshi Oga

I didn't trust an institution. So I put it on Bitcoin.
機関を信じるな。Bitcoinに刻んだ。
by TOshi Oga

Learn to read the estimate, not the contractor.
業者を選ぶんやない。見積書を読めるようになれ。
by TOshi Oga

Doubt anyone who says this is the market rate.
「これが相場です」と言う者を、まず疑え。
by TOshi Oga

Thirty years on site taught me the enemy is the middleman, not the craftsman.
30年現場におって、本当の敵は中抜きや。職人やない。
by TOshi Oga

The industry rewards salesmanship over craft. I want to break that.
営業力で選ばれる業界を、俺は壊したい。
by TOshi Oga

II. What the data shows

The same job, up to 91% apart between contractors.
同じ工事で、業者間で91%違う。
by TOshi Oga

Every middleman layer takes from the hand that does the work.
元請けが間に入るたびに、職人の手取りは減る。
by TOshi Oga

Remove the middlemen and the homeowner pays less while the craftsman earns more.
中抜きが消えれば、施主は安く払い、職人は多く受け取る。
by TOshi Oga

The word lump sum is a ghost.
見積書の「一式」は幽霊や。
by TOshi Oga

People renovate their homes without knowing if the price is fair.
自分の払う額が適正か、を知らずに人は家を直してる。
by TOshi Oga

III. The problem, stated plainly

Three quotes, pick the cheapest. Still not enough.
相見積もり3社で一番安い、それでもまだ足りん。
by TOshi Oga

900k, 950k, 970k yen. What if the real price was 850k.
90万・95万・97万、本当は85万かもしれん。
by TOshi Oga

How would I ever know. That is the whole problem.
「そんなん分からんやん」、ここが問題の全部や。
by TOshi Oga

Construction is a black box. Almost no one can tell a fair price from an inflated one.
建設はブラックボックスや。誰も適正価格を判別できない。
by TOshi Oga

It is not a people problem. It is an information problem.
それは人の問題やない。情報の問題や。
by TOshi Oga

I spent thirty years in an industry where you sign before you understand what you are paying for.
払う額が分からないまま契約させられる業界に、ずっとおった。
by TOshi Oga

IV. Who I am

Not a politician. Not a lawyer. A builder.
政治家やない。弁護士やない。ただの大工や。
by TOshi Oga

A carpenter of thirty years, who turned AI to the homeowner's side.
30年大工が、AIで施主の側に立った。
by TOshi Oga

Carpenter at 15. Code at 46.
15歳で大工修行。コードは46で始めた。
by TOshi Oga

Not an institution. One builder.
機関やない。一人の職人や。
by TOshi Oga

I left school early. The site became my school.
学校は早く出た。現場が学校やった。
by TOshi Oga

If you ask what I am, I am just a builder.
「あなたは何者か」と聞かれたら、ただの大工と答える。
by TOshi Oga

V. On governance and reform

I won't take the revolutionary's path. I take the reformer's.
革命家の道は取らん。改革者の道を取る。
by TOshi Oga

Build a system where all 12 players win in the long run.
12人のプレイヤー全員が、長期で勝つ仕組みを作る。
by TOshi Oga

I make no enemies. I change roles instead.
敵は作らん。役割を変えてもらう。
by TOshi Oga

Votes cannot be bought with money. They accumulate through verification.
投票は金で買えん。検証で積み上がる。
by TOshi Oga

Foundation stays fixed. Rules evolve.
土台は不変に。ルールは育てる。
by TOshi Oga

AI alone produces phantom errors. That is why humans must remain in the loop.
AIだけでは幻の誤判定を出す。だから人間がいる。
by TOshi Oga

The remedy for a credence-good market is verifiability.
信用財市場の処方箋は、検証可能性や。
by TOshi Oga

Transparency is the strongest defense.
透明であることが、最大の防御や。
by TOshi Oga

VI. To the homeowner, directly

Hold the question. Is what I am paying fair.
「私が払う額は適正か」、その問いを持て。
by TOshi Oga

You should not need thirty years to know. So I built the information.
1人で30年要らん。その情報を作った。
by TOshi Oga

Open the links. Check the hashes. Re-verify the timestamps.
開けて確かめろ。ハッシュをチェックしろ。タイムスタンプを再検証しろ。
by TOshi Oga

If something feels off, that instinct is usually right.
怪しいと思ったら、その直感は正しい。
by TOshi Oga

It feels a bit too expensive. You are probably right.
「ちょっと高い気がする」、それは多分合ってる。
by TOshi Oga

I thought it was expensive but couldn't say so. That one sentence is why I built this.
「高いと思ったけど言えなかった」、その一言のために作った。
by TOshi Oga

VII. For the craftsman

The one I most want to protect is the craftsman.
一番守りたいのは職人や。
by TOshi Oga

I want a world where blue-collar workers are valued and stand on equal ground.
ブルーカラーが見直され、強い立場になる世の中を作る。
by TOshi Oga

An industry where good hands cannot eat without salesmanship is broken.
良い手があっても、営業ができんと食えん業界は壊れてる。
by TOshi Oga

Remove the middlemen and the craftsman's pay returns.
中抜きをなくせば、職人の手取りは戻ってくる。
by TOshi Oga

VIII. On the movement

Stand at the start. Those who follow will shape what it becomes from what they see.
立ち上がるなら、最初に立て。後から来た人がその形を見て決める。
by TOshi Oga

I'm not asking for money. I'm asking for a number.
募集してるのは金やない。数や。
by TOshi Oga

The number itself is the message to the industry.
その数こそが、業界へのメッセージや。
by TOshi Oga

Not a politician. Not a lawyer. We change it ourselves.
政治家も弁護士も要らん。自分たちで変える。
by TOshi Oga

If one ex-carpenter can do this, ordinary people can change the rest.
一人の元大工がここまでできた。普通の人ができることはまだある。
by TOshi Oga

Sources: The Evidence · The Movement · JCCDB on GitHub · ORCID · Zenodo (origin paper) · engrXiv 7007
All claims verifiable. Bitcoin-anchored. Last updated 2026-06-01.

TOshi Oga,in his own words.