Pith Number

pith:WDYQ2S5Y

pith:2021:WDYQ2S5YVLYIWF2ULV5O7ZXNJE

not attested not anchored not stored refs pending

Toward determining the number of observable supermassive black hole shadows

Angelo Ricarte, Chung-Pei Ma, Daniel C. M. Palumbo, Dominic W. Pesce, Lindy Blackburn, Michael D. Johnson, Neil M. Nagar, Priyamvada Natarajan, Ramesh Narayan, Sheperd S. Doeleman

arxiv:2108.05228 v2 · 2021-08-09 · astro-ph.HE · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WDYQ2S5YVLYIWF2ULV5O7ZXNJE}

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

1 paper in Pith

The glow of eternal black holes

Receipt and verification

First computed	2026-07-05T03:47:00.281982Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b0f10d4bb8aaf08b17545d7aefe6ed4906caaa8cc1ec032aaf8ec7d0501d4223

Aliases

arxiv: 2108.05228 · arxiv_version: 2108.05228v2 · doi: 10.48550/arxiv.2108.05228 · pith_short_12: WDYQ2S5YVLYI · pith_short_16: WDYQ2S5YVLYIWF2U · pith_short_8: WDYQ2S5Y

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/WDYQ2S5YVLYIWF2ULV5O7ZXNJE \
  | 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: b0f10d4bb8aaf08b17545d7aefe6ed4906caaa8cc1ec032aaf8ec7d0501d4223

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7214b4fb8c17a2a9d3af4edd7301068178485098fa9c684b6f05826798ea64bc",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2021-08-09T18:07:54Z",
    "title_canon_sha256": "7ad5dcba5a6cbbe8804086027521db7dec2bfb992004d5089defc09d91fca208"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2108.05228",
    "kind": "arxiv",
    "version": 2
  }
}