Pith Number

pith:FKO4MPDK

pith:1997:FKO4MPDKEX63QVOMIQFXRPX33B

not attested not anchored not stored refs pending

The geometry of the quadruply imaged quasar PG 1115+080; implications for Ho

2), (2) Obs. Meudon, (3) CfA, (4) Astrop. Inst., (5) NORDITA, A.O. Jaunsen (4), Belgium, C.R. Keeton (3), C.S. Kochanek (3), C. Vanderriest (2), Danemark), F. Courbin (1, France, Harvard, J. Hjorth (5) ((1) Astrop. Inst., Liege, Norway, Oslo, P. Magain (1), USA

arxiv:astro-ph/9705093 v2 · 1997-05-13 · astro-ph

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

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	2026-05-18T04:21:40.426633Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2a9dc63c6a25fdb855cc440b78befbd85362fa894b7bf3827405c48b8a10067f

Aliases

arxiv: astro-ph/9705093 · arxiv_version: astro-ph/9705093v2 · doi: 10.48550/arxiv.astro-ph/9705093 · pith_short_12: FKO4MPDKEX63 · pith_short_16: FKO4MPDKEX63QVOM · pith_short_8: FKO4MPDK

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/FKO4MPDKEX63QVOMIQFXRPX33B \
  | 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: 2a9dc63c6a25fdb855cc440b78befbd85362fa894b7bf3827405c48b8a10067f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2482b98d008b51026ea6662ff59591317e71caec2d9a22e7a14acb565cdda929",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-05-13T09:43:41Z",
    "title_canon_sha256": "482dd6c3be0782e0b257a0cf6de33f5faf804e7871b266a32f70ae33541bb05b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9705093",
    "kind": "arxiv",
    "version": 2
  }
}