A record nobody can quietly edit.
Including us.
Recompute the newest snapshot’s SHA-256 from the public ledger and check it against the committed hash. This runs entirely in your browser, against the attestation repository, not against Koryu: no trust in this site is required.
Every day, Koryu publishes its daily snapshot: the board, the dial and, from their start dates, the Strategy v1.0 selection, the short board and the shadow's held positions. Before the market has had a chance to grade them, their SHA-256 fingerprints are committed to a public, timestamped log. Later, the files themselves are revealed. Anyone can recompute the hash from the revealed bytes and compare it to the earlier commitment: a match proves the snapshot existed at commitment time and has not been altered since. No trust in us is required at any step, which is the point.
The chain is live since 2026-07-13, and every run date through 2026-10-23 is committed in the public log except 2026-07-27, 2026-08-13 and 2026-09-30. Those days were never committed, so their archived snapshots are not attested. Publishing the mechanism first is deliberate. The rules of evidence get fixed before there is any record to flatter, the same pre-registration discipline the research program runs on, covered in the attestation explainer.
The machinery has a production precedent: the Shishin house runs this exact commit-reveal scheme live on its equity record, with a public repository and a standalone verification script, at shishin.io/verify. Koryu inherits the mechanism from day one.
Koryu's ledger is live at the public attestation log. Every attested day is a dated file under reveals/; the earliest is the first attested day, and the repository's standalone verify.py checks any of them.
One honest boundary, stated here the way it is stated everywhere on this site: attestation proves integrity, not quality. It makes the record tamper-evident; it says nothing about whether the measurements are useful. That question belongs to the research, and to you. Decisions are yours.
The four-step check
- Fetch the revealed snapshot for the day you care about.
- Recompute its SHA-256 hash on your own machine.
- Compare it to the hash committed in the public log.
- Check the commitment's timestamp precedes the outcomes you are judging.
Questions
What does Koryu's attestation prove?
That each attested day's published snapshot, the board, the dial, the day's Strategy v1.0 selection (from 2026-07-19), and the short board plus the shadow's held positions (from 2026-07-22), was committed to at a specific time and has not been edited since. The commitment (a SHA-256 hash) is published before outcomes are knowable; the snapshot bytes are revealed afterward and must match the hash.
Is the attestation live yet?
Yes. The chain is live since 2026-07-13, and every run date through 2026-10-23 is committed in the public log except 2026-07-27, 2026-08-13 and 2026-09-30. Those days were never committed, so their archived snapshots are not attested. Each committed day's hash and revealed snapshot sit in the public ledger, checkable with the repository's standalone verify.py.
Does attestation prove the measurements are good?
No. It proves integrity, not quality: the record existed when we say it did and has not changed. Whether the measurements are useful is a separate question the research library addresses, and no attestation can answer it.
Has this mechanism been run in production before?
Yes. The Shishin house, which Koryu is the fifth creature of, runs the same commit-reveal attestation live on its US-equity record, with a public repository and an independent verification script.