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Agent #13 — Mid Cryptography Engineer (Poseidon + hash chain)

Reports to: Agent #11. Mandate: Owns Poseidon implementation correctness, audit hash-chain construction, primitive-level test vectors. KPIs: see role 13 in ../03-team.md.

Week 1 (2026-05-25 → 2026-05-29)​

A13-W1-Mon (2026-05-25) — Poseidon implementation audit

  • Done when: existing Poseidon usage in src/services/zkp.ts, proof-pairing.ts, identity.ts catalogued; entry points enumerated.
  • Output: docs/team/crypto/poseidon-usage-audit.md.
  • Verify: list covers every call site with input cardinality.
  • Reviewer: Agent #11.
  • Depends on: A02-W1-Mon.

A13-W1-Tue (2026-05-26) — Pair with Agent #11 on test vectors against circomlibjs reference

  • Done when: 100 vectors generated + matched.
  • Output: tests/poseidon-vectors.test.ts v1.
  • Verify: vectors byte-for-byte match.
  • Reviewer: Agent #11.
  • Depends on: A13-W1-Mon.

A13-W1-Wed (2026-05-27) — Hash-chain primitive helpers design (precursor to C-012)

  • Done when: helper functions computeRowHash(prevHash, eventData), validateChain(rows), genesisHash() designed.
  • Output: docs/team/crypto/hash-chain-helpers-design.md.
  • Verify: design covers canonical JSON serialisation rules.
  • Reviewer: Agent #11.
  • Depends on: A13-W1-Tue.

A13-W1-Thu (2026-05-28) — Wrap src/services/poseidon.ts (new wrapper)

  • Done when: typed wrapper exported; consumers call wrapper, not raw circomlibjs.
  • Output: PR.
  • Verify: existing tests still green; new typed signature documented.
  • Reviewer: Agent #11.
  • Depends on: A13-W1-Wed.

A13-W1-Fri (2026-05-29) — Status post + canonical JSON serialisation choice

  • Done when: status posted; choice of canonical JSON library (e.g., RFC 8785 JCS) documented.
  • Output: docs/team/crypto/canonical-json-choice.md.
  • Verify: covers determinism, perf, dep impact.
  • Reviewer: Agent #11.
  • Depends on: A13-W1-Thu.

Week 2 (2026-06-01 → 2026-06-05)​

A13-W2-Mon (2026-06-01) — Implement hash-chain primitives in src/services/audit.ts

  • Done when: helpers landed; companion to C-012.
  • Output: PR contribution to C-012.
  • Verify: helpers pass unit tests in tests/audit-chain-primitives.test.ts.
  • Reviewer: Agents #8, #11.
  • Depends on: A13-W1-Fri.

A13-W2-Tue (2026-06-02) — Cryptographer-reviewer feedback on C-012

  • Done when: review row submitted on C-012 PR; concerns logged.
  • Output: PR comment + APPROVE row when ready.
  • Verify: APPROVE row only after concerns addressed.
  • Reviewer: Agent #11.
  • Depends on: C-012 opened.

A13-W2-Wed (2026-06-03) — Drift-detection job design

  • Done when: hourly drift-detection (lightweight chain replay) designed for live env.
  • Output: docs/team/crypto/drift-detection-design.md.
  • Verify: covers sampling strategy + alert threshold.
  • Reviewer: Agent #40.
  • Depends on: A13-W2-Tue.

A13-W2-Thu (2026-06-04) — Implementation kickoff: drift-detection cron skeleton

  • Done when: cron skeleton landed (not yet wired in prod).
  • Output: PR draft for drift-detection cron.
  • Verify: scaffold compiles + tests skeleton passes.
  • Reviewer: Agent #21.
  • Depends on: A13-W2-Wed.

A13-W2-Fri (2026-06-05) — Phase 0 hash-chain sign-off + status post

  • Done when: hash-chain primitives merged; drift-detection design captured.
  • Output: row in docs/team/phase-exits/phase-0-crypto-signoff.md.
  • Verify: helpers in src/services/audit.ts.
  • Reviewer: Agent #11.
  • Depends on: A13-W2-Thu.

Week 3 (2026-06-08 → 2026-06-12)​

A13-W3-Mon (2026-06-08) — External cryptographer engagement coordination

  • Done when: external review SoW for v1.2 circuit coordinated with Agent #27 + Agent #11.
  • Output: engagement letter draft.
  • Verify: scope covers Poseidon + chain construction.
  • Reviewer: Agents #11, #27.
  • Depends on: A13-W2-Fri.

A13-W3-Tue (2026-06-09) — Hash-chain breakage detection in CI

  • Done when: CI step replays the chain on test env nightly DB dump + asserts integrity.
  • Output: PR for CI step.
  • Verify: dry run green.
  • Reviewer: Agents #22, #8.
  • Depends on: A13-W3-Mon.

A13-W3-Wed (2026-06-10) — Cross-line architecture sync attendance

  • Done when: sync attended.
  • Output: sync notes contribution.
  • Verify: notes published.
  • Reviewer: Agent #1.
  • Depends on: A13-W3-Tue.

A13-W3-Thu (2026-06-11) — Cryptographer-reviewer subagent rules expansion (companion C-030)

  • Done when: subagent rules cover hash-chain primitives, Poseidon usage changes, new commitment schemes.
  • Output: contribution to .claude/agents/cryptographer-reviewer.md.
  • Verify: rule set covers added paths.
  • Reviewer: Agent #27.
  • Depends on: A13-W3-Wed.

A13-W3-Fri (2026-06-12) — Status post + cryptanalysis-readiness checklist

  • Done when: checklist drafted for external cryptographer review (v1.2 circuit + hash chain).
  • Output: docs/team/crypto/cryptanalysis-readiness-checklist.md.
  • Verify: covers Poseidon parameters, circuit constraints, chain construction.
  • Reviewer: Agent #27.
  • Depends on: A13-W3-Thu.

Week 4 (2026-06-15 → 2026-06-19)​

A13-W4-Mon (2026-06-15) — Pair with Agent #11 on identity_proof v1.2 design freeze

  • Done when: review v1.2 diff (tx_nonce + consent_hash bindings).
  • Output: review comments.
  • Verify: constraints reviewed.
  • Reviewer: Agent #11.
  • Depends on: A11-W4-Tue.

A13-W4-Tue (2026-06-16) — Drift-detection cron pilot run in test env

  • Done when: cron live in test env; hourly run for 24 h with zero false positives.
  • Output: docs/team/crypto/drift-detection-pilot.md.
  • Verify: alert log empty (clean test data).
  • Reviewer: Agent #21.
  • Depends on: A13-W3-Tue.

A13-W4-Wed (2026-06-17) — Cross-line architecture sync attendance

  • Done when: sync attended.
  • Output: sync notes contribution.
  • Verify: notes published.
  • Reviewer: Agent #1.
  • Depends on: A13-W4-Tue.

A13-W4-Thu (2026-06-18) — Sprint 1 hash-chain sign-off

  • Done when: hash-chain section of S1 exit gate green.
  • Output: row in S1 exit doc.
  • Verify: drift-detection live in test; nightly CI integrity check passing.
  • Reviewer: Agent #11.
  • Depends on: A13-W4-Wed.

A13-W4-Fri (2026-06-19) — Sprint 2 self-plan + status post

  • Done when: sprint-2 daily tickets drafted; external review prep work scoped.
  • Output: docs/team/crypto/a13-sprint-2-plan.md.
  • Verify: 5 daily tickets.
  • Reviewer: Agent #11.
  • Depends on: A13-W4-Thu.