Pith Number

pith:NRCRH5XO

pith:2021:NRCRH5XO5TUYLUZUKBU25SCCN7

not attested not anchored not stored refs pending

Observing the Inner Shadow of a Black Hole: A Direct View of the Event Horizon

Alexandru Lupsasca, Andrew Chael, Michael D. Johnson

arxiv:2106.00683 v1 · 2021-06-01 · astro-ph.HE · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NRCRH5XO5TUYLUZUKBU25SCCN7}

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.

Cited by

14 papers in Pith

Black Hole Photon Rings Saturate the Quantum Chaos Bound

Distorting Kerr Images with Parity-Odd Scalar Hair

Critical phenomenon inside asymptotically flat black holes with spontaneous scalarization

Imaging and Polarimetric Signatures of Konoplya-Zhidenko Black Holes with Various Thick Disk

Shadow signatures and energy accumulation in Lorentzian-Euclidean black holes

Receipt and verification

First computed	2026-07-05T03:12:06.597219Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6c4513f6eeece985d3345069aec8426fd15246a031c92df50974ef806b716410

Aliases

arxiv: 2106.00683 · arxiv_version: 2106.00683v1 · doi: 10.48550/arxiv.2106.00683 · pith_short_12: NRCRH5XO5TUY · pith_short_16: NRCRH5XO5TUYLUZU · pith_short_8: NRCRH5XO

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/NRCRH5XO5TUYLUZUKBU25SCCN7 \
  | 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: 6c4513f6eeece985d3345069aec8426fd15246a031c92df50974ef806b716410

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cc393541a193609ad7b4e3f2b6b8f175f7bc0d8b347493968fb8212b51f30fcb",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2021-06-01T18:00:01Z",
    "title_canon_sha256": "7883bdf9a8d2262e6a68399604ecb66936a242c8f6975ca1099d5279455034b3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2106.00683",
    "kind": "arxiv",
    "version": 1
  }
}