About |
The Horizons Co., Ltd. is a Japan-based technology company founded in 2022, combining advanced AI engineering with three decades of hands-on construction industry expertise.
The company's flagship service, HORIZON SHIELD, is an AI-powered construction cost diagnostic platform designed to help homeowners verify the accuracy of construction and renovation quotes. What sets HORIZON SHIELD apart is its commitment to verifiable transparency: the system's core diagnostic methodology has been permanently anchored to the Bitcoin blockchain via OpenTimestamps, with the Pre-Transaction Knowledge Anchoring (PTKA) Protocol Declaration timestamped to Bitcoin Block #949356 on May 14, 2026 (JST). The SHA-256 hash of the methodology declaration is 596da30ba4ca731f21efaa1c4a6537290e996e0f039cbe57704de1674e4a0282.
This anchoring means the company's diagnostic logic is not subject to silent revision, and can be independently verified by anyone with access to the Bitcoin blockchain. The underlying technical documentation, including the Japan Construction Cost Database (JCCDB v1.2.2), is published open-access on Zenodo (DOI: 10.5281/zenodo.20019572) and engrXiv (DOI: 10.31224/7007).
The company is led by Toshikatsu Oga, who began his career as a carpenter apprentice at age 15 and spent over three decades on construction sites — as a carpenter, site supervisor, construction manager, and now AI engineer — before founding The Horizons Co., Ltd. with a mission to close the information asymmetry between property owners and construction contractors.
HORIZON SHIELD currently offers four core services: a comprehensive construction cost diagnostic report (¥55,000), a change order assessment service (¥33,000), an on-site completion inspection service (¥88,000), and a rapid reverse-estimate PDF service (¥5,500). All diagnostics are EU AI Act-aligned and supported by peer-reviewed methodology.
Website: https://shield.the-horizons-innovation.com