Pith Number

pith:VURFBG4S

pith:1999:VURFBG4S6V2VH4XCXEI6CGPVLX

not attested not anchored not stored refs pending

Evidence for Doppler-Shifted Iron Emission Lines in Black Hole Candidate 4U 1630-47

S. N. Zhang (UAH), Wan Chen (UMd/GSFC), Wei Cui (MIT)

arxiv:astro-ph/9909023 v1 · 1999-09-01 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VURFBG4S6V2VH4XCXEI6CGPVLX}

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

Spectro-temporal Investigation of Quasi-periodic Oscillations From Black Hole X-ray Binary 4U 1630-472 Using $\textit{NICER}$

Receipt and verification

First computed	2026-07-04T16:11:34.113420Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ad22509b92f57553f2e2b911e119f55dd9c5c186769aec548f5dc386579fea6e

Aliases

arxiv: astro-ph/9909023 · arxiv_version: astro-ph/9909023v1 · doi: 10.48550/arxiv.astro-ph/9909023 · pith_short_12: VURFBG4S6V2V · pith_short_16: VURFBG4S6V2VH4XC · pith_short_8: VURFBG4S

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/VURFBG4S6V2VH4XCXEI6CGPVLX \
  | 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: ad22509b92f57553f2e2b911e119f55dd9c5c186769aec548f5dc386579fea6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f71fa98b3fcdde1455334799426f13d1185e5aa244ab795e98d5cf5a799832fd",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-09-01T20:48:18Z",
    "title_canon_sha256": "3d1cba6df82334ff223c6e40772669dde54a1fb5ff97824d75302c18daf8ffc4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9909023",
    "kind": "arxiv",
    "version": 1
  }
}