Pith Number

pith:XPD7PZDR

pith:2021:XPD7PZDRSWKQCBBUEKNA57UI7N

not attested not anchored not stored refs pending

Gaia 400,894 QSO constraint on the energy density of low-frequency gravitational waves

Daisuke Yamauchi, Maresuke Shiraishi, Masami Ouchi, Shohei Aoyama

arxiv:2105.04039 v1 · 2021-05-09 · gr-qc · astro-ph.CO · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XPD7PZDRSWKQCBBUEKNA57UI7N}

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

Synergies Between Pulsar Timing Array and Astrometry

Receipt and verification

First computed	2026-07-05T02:38:41.187040Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bbc7f7e4719595010434229a0efe88fb655621c1427adbcee4bdbb3b2d626521

Aliases

arxiv: 2105.04039 · arxiv_version: 2105.04039v1 · doi: 10.48550/arxiv.2105.04039 · pith_short_12: XPD7PZDRSWKQ · pith_short_16: XPD7PZDRSWKQCBBU · pith_short_8: XPD7PZDR

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/XPD7PZDRSWKQCBBUEKNA57UI7N \
  | 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: bbc7f7e4719595010434229a0efe88fb655621c1427adbcee4bdbb3b2d626521

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0b1be77dca8f1fc65334a471a6c11abf5a113752a6e68cb438592adaf36e7a51",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.IM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2021-05-09T22:26:10Z",
    "title_canon_sha256": "a3ed7a34619d8d5e0243f9d137632343555dc914ef3b552a735eabfdb89cabc5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2105.04039",
    "kind": "arxiv",
    "version": 1
  }
}