Pith Number

pith:QVZLUHNE

pith:2011:QVZLUHNEHFD7F5IQZLF7HEKARU

not attested not anchored not stored refs pending

An Upper Bound to the Space Density of Interstellar Comets

M. Jura (UCLA)

arxiv:1102.4319 v1 · 2011-02-21 · 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{QVZLUHNEHFD7F5IQZLF7HEKARU}

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	2026-05-18T02:03:06.896815Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8572ba1da43947f2f510cacbf391408d14266c6017734ea837edaae1fbb59f3d

Aliases

arxiv: 1102.4319 · arxiv_version: 1102.4319v1 · doi: 10.48550/arxiv.1102.4319 · pith_short_12: QVZLUHNEHFD7 · pith_short_16: QVZLUHNEHFD7F5IQ · pith_short_8: QVZLUHNE

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/QVZLUHNEHFD7F5IQZLF7HEKARU \
  | 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: 8572ba1da43947f2f510cacbf391408d14266c6017734ea837edaae1fbb59f3d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d4da0a5cc239dfc5a6106e1d64fa6924b179c764263e6e802666b522f5646d8b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2011-02-21T20:15:29Z",
    "title_canon_sha256": "3336bf20578788003439cc9e8797b41a318590d6cbca60337403fe544ad6d313"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1102.4319",
    "kind": "arxiv",
    "version": 1
  }
}