Pith Number

pith:2WU5M4Z3

pith:2009:2WU5M4Z3SL4Y7LFGPHB6VO2KAB

not attested not anchored not stored refs pending

Determination of masses of the central black holes in NGC524 and NGC2549 using Laser Guide Star Adaptive Optics

Davor Krajnovic, Michele Cappellari, Richard M. McDermid, Roger L. Davies

arxiv:0907.3748 v1 · 2009-07-21 · astro-ph.GA · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2WU5M4Z3SL4Y7LFGPHB6VO2KAB}

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	2026-05-18T02:12:54.877350Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5a9d6733b92f98faca679c3eabb4a007379a4756e853300c68e75215aa3485c

Aliases

arxiv: 0907.3748 · arxiv_version: 0907.3748v1 · doi: 10.48550/arxiv.0907.3748 · pith_short_12: 2WU5M4Z3SL4Y · pith_short_16: 2WU5M4Z3SL4Y7LFG · pith_short_8: 2WU5M4Z3

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/2WU5M4Z3SL4Y7LFGPHB6VO2KAB \
  | 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: d5a9d6733b92f98faca679c3eabb4a007379a4756e853300c68e75215aa3485c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ae08b6fb574026f897d9eb370b9d1c0e44652a8489c7455e6dc753c54ae0db73",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-07-21T21:25:00Z",
    "title_canon_sha256": "242c0bfd765bddcbbc8dd8800f5e39aaf50ef465342ae4794825d19bf748f502"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.3748",
    "kind": "arxiv",
    "version": 1
  }
}