Pith Number

pith:ZEV2ZWMZ

pith:2026:ZEV2ZWMZCGPZNOHS3XTQIUYURT

not attested not anchored not stored refs pending

Beyond Sgr A* and M87*: Sub-Microarcsecond Black Hole Shadow Detection via Lunar-based Extremely Long Baseline Interferometry

Lei Liu, Ru-Sen Lu, Shan-Shan Zhao, Yosuke Mizuno, Zhiqiang Shen

arxiv:2601.02812 v2 · 2026-01-06 · astro-ph.GA · astro-ph.IM

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZEV2ZWMZCGPZNOHS3XTQIUYURT}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-06-19T16:12:17.477077Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c92bacd999119f96b8f2dde70453148cec9c8bec3d4c7846ea32884b78f0f81d

Aliases

arxiv: 2601.02812 · arxiv_version: 2601.02812v2 · doi: 10.48550/arxiv.2601.02812 · pith_short_12: ZEV2ZWMZCGPZ · pith_short_16: ZEV2ZWMZCGPZNOHS · pith_short_8: ZEV2ZWMZ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/ZEV2ZWMZCGPZNOHS3XTQIUYURT \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c92bacd999119f96b8f2dde70453148cec9c8bec3d4c7846ea32884b78f0f81d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "13d369901a8cd1f8854ac0d0383dcf7faf687fcf069b0567d420b4947909ad30",
    "cross_cats_sorted": [
      "astro-ph.IM"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-01-06T08:40:25Z",
    "title_canon_sha256": "6c4642058203571f9934c469f2ad7345887fd28fb228b595d6ffed33a40601f1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.02812",
    "kind": "arxiv",
    "version": 2
  }
}