Pith Number

pith:FKFY4QJR

pith:2009:FKFY4QJRQNDECKOCQMG4OI42VO

not attested not anchored not stored refs pending

The Future of Direct Supermassive Black Hole Mass Estimates

(2) Space Telescope Science Institute), A. M. Koekemoer (2) ((1) Rochester Institute of Technology, D. Batcheldor (1)

arxiv:0909.4245 v1 · 2009-09-23 · 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{FKFY4QJRQNDECKOCQMG4OI42VO}

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	2026-05-18T02:11:44.806916Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2a8b8e413183464129c2830dc7239aabb85d7e5ee932b100db5b2de07b587977

Aliases

arxiv: 0909.4245 · arxiv_version: 0909.4245v1 · doi: 10.48550/arxiv.0909.4245 · pith_short_12: FKFY4QJRQNDE · pith_short_16: FKFY4QJRQNDECKOC · pith_short_8: FKFY4QJR

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/FKFY4QJRQNDECKOCQMG4OI42VO \
  | 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: 2a8b8e413183464129c2830dc7239aabb85d7e5ee932b100db5b2de07b587977

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f06d7e483b013df7cc58914434318e9cf2c7ab57e3a46ebc9c3816d4f9a29480",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-23T16:13:17Z",
    "title_canon_sha256": "3390ea5adff713e4fb8dbefa1847ae19b79759f064991dea5d032e10ffc3c088"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.4245",
    "kind": "arxiv",
    "version": 1
  }
}