Pith Number

pith:QLG7RPPY

pith:2013:QLG7RPPYEIQUUIQ4GZ664AJ7DW

not attested not anchored not stored refs pending

Observations of the unique X-ray emitting subdwarf stars HD49798 and BD+37 442

2), 2 - IUSS Pavia, 3 - INAF / OA Roma, A. Tiengo (1, G.L. Israel (3) (1 - INAF / IASF Milano, Italy, Italy), L. Stella (3), N. La Palombara (1), P. Esposito (1), S. Mereghetti (1)

arxiv:1306.6861 v1 · 2013-06-28 · astro-ph.HE · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QLG7RPPYEIQUUIQ4GZ664AJ7DW}

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	2026-05-18T03:19:42.707535Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

82cdf8bdf822214a221c367dee013f1da3b8ab5aff2e9ad965c5ccc263c205d2

Aliases

arxiv: 1306.6861 · arxiv_version: 1306.6861v1 · doi: 10.48550/arxiv.1306.6861 · pith_short_12: QLG7RPPYEIQU · pith_short_16: QLG7RPPYEIQUUIQ4 · pith_short_8: QLG7RPPY

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/QLG7RPPYEIQUUIQ4GZ664AJ7DW \
  | 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: 82cdf8bdf822214a221c367dee013f1da3b8ab5aff2e9ad965c5ccc263c205d2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "711ab5e79e814088b76f97ee4cb6a8e83849db65ceb1301ec25b53693cd582be",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2013-06-28T14:56:23Z",
    "title_canon_sha256": "cf2fea9a5d913a7d0078f3388fc69147e1ef2fc50f29bc9d535282c9e31704bc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1306.6861",
    "kind": "arxiv",
    "version": 1
  }
}