Pith Number

pith:KA6OE5DF

pith:2009:KA6OE5DF5CIM3FROORWL5ZYIIC

not attested not anchored not stored refs pending

X-ray and Radio Variability of M31*, The Andromeda Galaxy Nuclear Supermassive Black Hole

Ben Williams, Frank A. Primini, Frederick K. Baganoff, Fulvio Melia, Jose Galache, Lorant O. Sjouwerman, Michael R. Garcia, Richard Hextall, Stephen S. Murray

arxiv:0907.4977 v1 · 2009-07-28 · 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{KA6OE5DF5CIM3FROORWL5ZYIIC}

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	2026-05-18T02:12:46.960887Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

503ce27465e890cd962e746cbee70840b5e4bea4c742de7efb002f7f5b30a986

Aliases

arxiv: 0907.4977 · arxiv_version: 0907.4977v1 · doi: 10.48550/arxiv.0907.4977 · pith_short_12: KA6OE5DF5CIM · pith_short_16: KA6OE5DF5CIM3FRO · pith_short_8: KA6OE5DF

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/KA6OE5DF5CIM3FROORWL5ZYIIC \
  | 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: 503ce27465e890cd962e746cbee70840b5e4bea4c742de7efb002f7f5b30a986

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ea0050a363014167a1b74c8195bd601059b867ceb423bbad3e37bc2d9e6ffdba",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2009-07-28T19:41:42Z",
    "title_canon_sha256": "5bb829b9e6a283c3c571f461ef89145315c5eff3d32e614b5c5fed606f6f1c76"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.4977",
    "kind": "arxiv",
    "version": 1
  }
}