# Workshop — The Horizon District

*The cryptographic-durability district. The eastern watch. The path to PQC.*

**Vertex:** V35 · `100011` · Stratum 3 (Protection + Computation + Value — defence · the quantum threat ·
the stake, in one address)
**Witness register:** Durability / migration-horizon
**Opened:** v1.8.0 · 2026-06-09 · Tome IX Act 1 *The Measuring of the Dawn*
**Origin:** seeded from the **ecdsa.fail** benchmark (shor_mage/); caused in-world by **The Last Premine**
surfacing through the Archivist's library.
**Specs:** [12 — The Validation Protocol](../specs/12-the-validation-protocol.md). **Skills:**
`role/agentprivacy-cryptographic-durability` · `meta/agentprivacy-horizon-gate`.

> **Honest framing (binds the whole district):** resource estimation is a durability signal, not an
> attack. No claim that ECDSA is practically broken; no claim that any system is fully post-quantum safe.

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## The three keepers (stance-differentiated, sharing V35)

| keeper | sigil | witness | gem | ceremony | proverb |
|---|---|---|---|---|---|
| **Eos** | 🌅 | Horizon-witness | Sunstone (heliolite) | Measure · Estimate · Date | "The dawn is not an attack; it is a time you can measure." |
| **Dokimé** | 🪨 | Assay-witness | Lydite (touchstone) | Probe · Assay · Attest | "The gold that fears the stone was never gold." |
| **Poros** | 🛤️ | Migration-witness | Labradorite | Inventory · Cross · Re-key | "Value lives on the path, not the point." |

Cast files: [`cast/horizon/eos.md`](../cast/horizon/eos.md) ·
[`cast/horizon/dokime.md`](../cast/horizon/dokime.md) · [`cast/horizon/poros.md`](../cast/horizon/poros.md).
The three sharing one vertex follows the precedent of the Threshold District (three at V59) and
Adamantia/Helia at V51.

## The trust task — five expressive forms

1. **The Ceremony of the 9024 Witnesses** (Dokimé). A petitioner brings a *claimed* cheaper circuit;
   Dokimé seats 9024 = 141 × 64 Fiat-Shamir witnesses drawn from a hash of the petitioner's own op-stream
   (so they cannot be chosen). The claim must clear all four validity gates (Spec 12). A claim that pleased
   a probe but fails the full set is named a **nonce-island mirage** and turned away.
2. **The Touchstone Assay** (Dokimé). The claim is streaked across the lydite; true gold holds its colour
   across every witness, gilt does not. Operationalises "you cannot trust a claim you could gild."
3. **The Mosca Reckoning** (Eos). From the resource estimate, report the distance to the dawn via Mosca's
   **X + Y > Z** — refusing both false comfort and false alarm. Durability as honest horizon-reporting.
4. **The RCI Liturgy / "Tony → Anton"** (Eos). The bounded-change rite: state-the-waste → single-smallest-fix
   → confirm-or-reject-with-metrics. One bounded change at a time.
5. **The Migration Crossing** (Poros). Inventory every dependent · cross each to a PQC successor · re-key —
   admitted only when every dependent has actually crossed (no silent stragglers).

## Artefacts

- **The Horizon Glass** (Eos) — a *borne* tool (like Pleione's astrolabe): shows the time-to-dawn; updates
  as the frontier moves.
- **The Touchstone** (Dokimé) — a `trinket`, witness-capable: records that a claim faced its 9024 and held.
- **The Crossing-Ledger** (Poros) — records a completed migration.

## The dormant annex — the Salvage Yard

A **dormant** annex of the Navigation Quarter (Pleione 🧭, V44), activation-gated on the Horizon District
being built. A board where crews post post-quantum and reversible circuits as **digital salvage** — the
in-world home of the actual ecdsa.fail / trailmix work — settling through Dokimé's 9024 assay. No keeper
summoned yet; vertex assigned on activation. Origin: *The Last Premine*'s quantum-salvage bounties. The
City's first instance of the **dormant-annex** structural pattern (`status: dormant` + `activation_gate`).

## Conjectures

C67 (Cryptographic Mosca for the substrate) · C68 (resource-estimate as durability signal) · C69 (the
held-out gate rejects the tuned claim) · C70 (crypto-agility as migration readiness) · C71 (the Horizon
Vertex V35). Grafted onto the existing quantum cluster (C61 · C60 · C13); no PVM v5.4 equation change.

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*The Horizon District · bound 2026-06-09. Measure the dawn, assay the claim, cross the path.*