Pith Number

pith:K4E3X7QS

pith:2011:K4E3X7QSPOFSNXUY5TQSBNQ45V

not attested not anchored not stored refs pending

New Evidence for High Activity of the Super-Massive Black Hole in our Galaxy

Katsuji Koyama, Masayoshi Nobukawa, Syukyo G. Ryu, Takeshi Go Tsuru

arxiv:1109.1950 v1 · 2011-09-09 · 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{K4E3X7QSPOFSNXUY5TQSBNQ45V}

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	2026-05-18T02:00:37.368874Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5709bbfe127b8b26de98ece120b61ced7c959a5dee954e2922a6bccf289f2ab6

Aliases

arxiv: 1109.1950 · arxiv_version: 1109.1950v1 · doi: 10.48550/arxiv.1109.1950 · pith_short_12: K4E3X7QSPOFS · pith_short_16: K4E3X7QSPOFSNXUY · pith_short_8: K4E3X7QS

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/K4E3X7QSPOFSNXUY5TQSBNQ45V \
  | 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: 5709bbfe127b8b26de98ece120b61ced7c959a5dee954e2922a6bccf289f2ab6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f69379056217595f919d0757273643cb3c6277e3ca28c99fba291db8b42a3496",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2011-09-09T09:59:08Z",
    "title_canon_sha256": "77a69da65992af53e2cc71ca2d513c02b897d5445143b6d56bb240f05caab819"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.1950",
    "kind": "arxiv",
    "version": 1
  }
}