Pith Number

pith:GTXXYLAI

pith:2011:GTXXYLAIX6IIJCPZKKBHUXJHBC

not attested not anchored not stored refs pending

More evidence for extinction of activity in galaxies

Andrzej Marecki, Bartlomiej Swoboda (Torun Centre for Astronomy, N. Copernicus University, Torun)

arxiv:1104.2521 v1 · 2011-04-13 · 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{GTXXYLAIX6IIJCPZKKBHUXJHBC}

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	2026-05-18T04:22:21.687820Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

34ef7c2c08bf908489f952827a5d270890782ae1b1f2fad5030ed505301053bd

Aliases

arxiv: 1104.2521 · arxiv_version: 1104.2521v1 · doi: 10.48550/arxiv.1104.2521 · pith_short_12: GTXXYLAIX6II · pith_short_16: GTXXYLAIX6IIJCPZ · pith_short_8: GTXXYLAI

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/GTXXYLAIX6IIJCPZKKBHUXJHBC \
  | 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: 34ef7c2c08bf908489f952827a5d270890782ae1b1f2fad5030ed505301053bd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f5f1dc79c60edf1764f81c6b033b75ee6adcaa7b0fe6f17c6b5eba22a672b31f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-04-13T15:03:10Z",
    "title_canon_sha256": "b2376515cf4d8f394e3d555dc02f44bffea4fec6341898f182cd2b6909fe7d2a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.2521",
    "kind": "arxiv",
    "version": 1
  }
}