Pith Number

pith:Q45KV2LG

pith:2010:Q45KV2LG4NAF3N6FJZ2I3I37OQ

not attested not anchored not stored refs pending

The black hole in NGC 1313 X-2: constraints on the mass from optical observations

Alessandro Patruno (API, Luca Zampieri (INAF - Osservatorio Astronomico di Padova), Univ. Amsterdam)

arxiv:1001.3315 v1 · 2010-01-19 · astro-ph.HE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Q45KV2LG4NAF3N6FJZ2I3I37OQ}

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	2026-05-18T02:09:42.391995Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

873aaae966e3405db7c54e748da37f7414056bd1fa97aabeaa35e8a4a5b8c435

Aliases

arxiv: 1001.3315 · arxiv_version: 1001.3315v1 · doi: 10.48550/arxiv.1001.3315 · pith_short_12: Q45KV2LG4NAF · pith_short_16: Q45KV2LG4NAF3N6F · pith_short_8: Q45KV2LG

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/Q45KV2LG4NAF3N6FJZ2I3I37OQ \
  | 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: 873aaae966e3405db7c54e748da37f7414056bd1fa97aabeaa35e8a4a5b8c435

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "feaece9fa4718f5c1f8e482b496097c40ebc06b2b39bc9ae7cadf5908ca0c9b3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2010-01-19T14:30:21Z",
    "title_canon_sha256": "84d3a5b33be581486d5774606d9db1c234b4c4df90b1fd072ebe9d5bfb2f7d63"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1001.3315",
    "kind": "arxiv",
    "version": 1
  }
}