diff --git a/docs/Encoding_Protocol_v0_2.md b/docs/Encoding_Protocol_v0_2.md
index 3eb45def..89808894 100644
--- a/docs/Encoding_Protocol_v0_2.md
+++ b/docs/Encoding_Protocol_v0_2.md
@@ -603,10 +603,16 @@ timestamped. Ten ledgers were read; ten orderings held.
     condition pins      10/10 read `same` — a trial of the frozen condition
     voids               1 (tool-surface breach), replaced; ledgered in the report
 
-Pre-registered before the first counted run in
-`credenza/docs/donetest/C_SERIES_PREREGISTRATION.md`; reported in
-`credenza/docs/donetest/C_SERIES_REPORT.md` with the composition table, the void ledger and the
-verification transcripts.
+Pre-registered before the first counted run; reported with the composition table, the void
+ledger and the verification transcripts. **The packages, the pre-registration, the report and
+the per-run notes are published at `studies/c-series/` and archived at https://doi.org/10.5281/zenodo.22167996**, so every
+citation here resolves for a reader outside this project.
+
+Each package verifies from the anchors it ships:
+
+    pip install uofa
+    uofa verify uofa.jsonld --pubkey keys/uofa-issuer.pub \
+        --decision-pubkey keys/demo-reviewer.pub
 
 **What the rate does and does not say.** The signatures attest completion of the governed review
 **with dispositions recorded where evidence was unrecoverable** — nine of ten packages explicitly
diff --git a/studies/c-series/README.md b/studies/c-series/README.md
index d97f48e1..2f446a55 100644
--- a/studies/c-series/README.md
+++ b/studies/c-series/README.md
@@ -3,6 +3,16 @@
 The artifacts behind Chapter 4 §4.6 and the Validation Record appendix of
 `docs/Encoding_Protocol_v0_2.md`.
 
+**Archived: https://doi.org/10.5281/zenodo.22167996** (deposit version
+`c-series-v1`). Cite the DOI for the manuscript; cite this directory for a reader
+who wants to run the checks.
+
+**Two DOIs, and which to cite.** `10.5281/zenodo.22167996` is the **version
+DOI** — this release, these exact bytes, and what a manuscript should cite so
+the reference cannot move under it. `10.5281/zenodo.22167995` is the **concept
+DOI**, which always resolves to the latest version of this supplement; cite it
+only where "the supplement, whatever its current version" is what is meant.
+
 **These are published so a stranger can check the claim without asking anyone.**
 Each package verifies from the anchors it ships, against the wheel on PyPI, on a
 machine that has never seen this repository.
diff --git a/studies/ch4_numbers/LEDGER.md b/studies/ch4_numbers/LEDGER.md
index 23693ddb..3fd41912 100644
--- a/studies/ch4_numbers/LEDGER.md
+++ b/studies/ch4_numbers/LEDGER.md
@@ -520,8 +520,11 @@ Frozen set: pv1, prompt hash `35033e4b…`, application `716d92d9`,
 | Messages per run, range | 783 – 1345 | " | " | " |
 
 **Both escalations CLOSED, 2026-08-29, venue: this repository,
-`studies/c-series/`** (commit `793470e4`; a Zenodo deposit for the manuscript
-DOI is minted from these same bytes).
+`studies/c-series/`** (commit `793470e4`, release `c-series-v1`), archived at
+**https://doi.org/10.5281/zenodo.22167996** — the **version DOI**, minted from
+these same bytes and the citable form for the manuscript, because a version DOI
+cannot move under a reference. The concept DOI `10.5281/zenodo.22167995`
+resolves to the latest version and is *not* what a results chapter should cite.
 
 - *The primary artifacts were uncommitted.* The ten signed zips lived only in a
   local run directory. They are now committed, with `SHA256SUMS` matching the