30-Year Construction Veteran Launches Bitcoin-Anchored AI Diagnostic for Japanese Renovation Market

HIRATSUKA, Japan - May 15, 2026 - PRLog -- HIRATSUKA, JAPAN — May 16, 2026 — In an industry where homeowners have historically had no way to verify the accuracy of construction quotes, Toshikatsu Oga is offering something new: independently verifiable AI diagnostics. Oga, who began his career as a carpenter apprentice at age 15 and spent three decades on construction sites before transitioning into AI engineering, has launched HORIZON SHIELD, an AI-powered service that diagnoses construction quotes for homeowners — and has anchored its methodology to the Bitcoin blockchain to demonstrate that the system's core logic is not subject to silent revision.

The Pre-Transaction Knowledge Anchoring (PTKA) Protocol Declaration was timestamped to Bitcoin Block #949356 on May 14, 2026 (JST) via OpenTimestamps, with SHA-256 hash 596da30ba4ca731f21efaa1c4a6537290e996e0f039cbe57704de1674e4a0282.

HORIZON SHIELD offers four services for property owners in Japan:

- Construction Cost Diagnostic (quote assessment): ¥55,000 — for projects up to ¥5 million
- Change Order Assessment: ¥33,000 — for additional work up to ¥500,000
- Final Inspection Attendance: ¥88,000 plus travel expenses
- Reverse Estimate PDF Report: ¥5,500 — AI-generated fair-price benchmark document

The underlying methodology — the Japan Construction Cost Database (JCCDB v1.2.2) — is published open-access at Zenodo (DOI: 10.5281/zenodo.20019572) and engrXiv (DOI: 10.31224/7007). Oga's ORCID is 0009-0000-9180-903X.

About The Horizons Co., Ltd.:
The Horizons Co., Ltd. (The HORIZ音s株式会社) was established February 22, 2022, and is based in Hiratsuka, Kanagawa, Japan. The company operates HORIZON SHIELD, an AI-powered construction cost diagnostic service designed to close the information asymmetry between contractors and property owners in Japan's renovation market.

Contact:
Toshikatsu Oga, Representative Director
The Horizons Co., Ltd.
teamhorizonshield@gmail.com
https://shield.the-horizons-innovation.com
https://www.linkedin.com/in/thehorizons/