card: how to cite, corrections ledger and verification links

README.md

@@ -279,3 +279,28 @@ Measurement credential, never certification. Free refresh only.
 
 
 Owner: N-Sites — free paste onto HF/Kaggle printers. Hub LIVE **131** (kill 1191/1196). card_index n=335. Never invent VC/revenue. Stamp 2026-09-14T10:37Z.
+
+<!-- csoai-cite-v1:start -->
+## How to cite
+
+CSOAI Ltd (Council of AI). *GSPC — distribution integrity facts (DistributionFacts)*. 2026. Hugging Face dataset `csoai/gspc-distribution-integrity`. https://huggingface.co/datasets/csoai/gspc-distribution-integrity. DOI: [10.57967/hf/10287](https://doi.org/10.57967/hf/10287)
+
+```bibtex
+@misc{csoai_gspc_distribution_integrity,
+  title        = {GSPC — distribution integrity facts (DistributionFacts)},
+  author       = {{CSOAI Ltd}},
+  year         = {2026},
+  howpublished = {Hugging Face dataset, https://huggingface.co/datasets/csoai/gspc-distribution-integrity},
+  doi          = {10.57967/hf/10287},
+  note         = {Corrections: https://councilof.ai/api/corrections}
+}
+```
+
+Licence: CC-BY-4.0. Attribute Council of AI, CSOAI Ltd (16939677), https://councilof.ai.
+
+## Corrections and verification
+
+- Corrections ledger (signed): https://councilof.ai/api/corrections. Corrections to CSOAI's published records are logged there with what changed and when.
+- Verify a signed record yourself, free and without an account: https://councilof.ai/gspc-verify/ (step by step: https://councilof.ai/signed/HOW-TO-VERIFY.md).
+- Conformance kit for signed-receipts/v1, with test vectors for implementers: https://councilof.ai/spec/signed-receipts/v1/conformance/
+<!-- csoai-cite-v1:end -->