Pith Number

pith:PDEHVI72

pith:2020:PDEHVI72LF27JZ2AU4Q5DNRZM6

not attested not anchored not stored refs pending

Disk evolution of the M87's nucleus observed in 2008

Cheng cheng, Fei Xiang

arxiv:2002.09122 v1 · 2020-02-21 · astro-ph.HE · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PDEHVI72LF27JZ2AU4Q5DNRZM6}

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	2026-07-05T01:22:41.453083Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78c87aa3fa5975f4e740a721d1b639678130c8cb985ddf42dca6c4e3f6a1121d

Aliases

arxiv: 2002.09122 · arxiv_version: 2002.09122v1 · doi: 10.48550/arxiv.2002.09122 · pith_short_12: PDEHVI72LF27 · pith_short_16: PDEHVI72LF27JZ2A · pith_short_8: PDEHVI72

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/PDEHVI72LF27JZ2AU4Q5DNRZM6 \
  | 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: 78c87aa3fa5975f4e740a721d1b639678130c8cb985ddf42dca6c4e3f6a1121d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b807dddb47692215e556553040af440ce1b5061a25233dab93e76f42fe9cd2dd",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2020-02-21T04:16:24Z",
    "title_canon_sha256": "5b2bfb1682ff915d5be8ba9a02c305fc19a8e49c04191791337b6930a9978b28"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2002.09122",
    "kind": "arxiv",
    "version": 1
  }
}