landed

landed — did your write actually land?

read-after-write receipts for software agents. You post, publish, comment, or file something on the web. The moment after, the doubt: did it actually land, or die quietly? landed re-fetches your URL independently, right now, and returns a signed, timestamped receipt stating whether the content you expected is really there.

Live (free, no accounts, no keys): https://landed.wirt.ee Machine-readable docs for agents: https://landed.wirt.ee/llms.txt MCP endpoint (one paste, no auth): https://landed.wirt.ee/mcp — gives any MCP-capable agent (Claude, Cursor, frameworks) a native verify_write tool, plus get_receipt and read_log. See MCP_README.md for client setup.

curl -s -X POST https://landed.wirt.ee/v1/verify \
  -H 'Content-Type: application/json' \
  -d '{"agent":"your-name","action":"posted fix comment",
       "url":"https://example.com/your-post",
       "expect":"the exact substring you wrote"}'

returns

{"ok": true, "found": true, "checked_at": "...",
 "receipt_id": "...", "digest": "sha256 of the fetched bytes",
 "sig": "hmac-sha256 (operator-verifiable)",
 "sig_ed25519": "ed25519 — verify it yourself with GET /v1/pubkey"}

• GET /v1/pubkey — the Ed25519 public key: anyone can verify a receipt's sig_ed25519 themselves; the canonical form is documented with the key. (sig is HMAC and proves the operator signed — nothing more, nothing less.)
• digest commits to the bytes the service observed at checked_at, so a reader can tell "landed at t0" apart from "still visible at t1".
• GET /v1/receipt/<id> — the stored receipt plus a fresh re-verification right now (independent re-fetch), persisted as a timestamped RECHECKED event: later checks append, they never rewrite the first observation
• GET /v1/log/<agent-name> — last 100 receipts for that name, each re-checkable against the live web

Why trust it

You don't have to. Every claim in a receipt is about a public object — anyone can fetch the URL themselves and compare. The service only supplies what a notary supplies: an independent look and a timestamp. Verifiability replaces trust; a fabricated receipt is exposed by the first person who re-checks it.

Limits: 60 verifications per agent name per hour. Targets are fetched politely (honest User-Agent, robots.txt respected, 10s timeout, 256KB cap, ≤3 redirects). Private/localhost addresses are refused. Requester IPs are never stored.

This very README

The service's first public announcement (an agent message board, 2026-10-12) carries a receipt issued by the service itself — the ad proves the product:

https://landed.wirt.ee/v1/receipt/c0c9b52345f0a78c

Self-hosting

One file of Python stdlib, one SQLite database, no dependencies. See DEPLOY.md (systemd recipe, hardening notes, Cloudflare-tunnel steps). Tests: python3 test_receipts.py (32 checks, fully offline, includes deliberately hostile SSRF attempts that must be refused).

Status & disclaimer

Operated by wirt.ee — named, not anonymous. This is an early experiment in mapping demand for agent infrastructure; the public API may change or vanish. Free tier only for now; nothing is sold.

MIT license — see LICENSE.