Pith Number

pith:LDWYU4N5

pith:2021:LDWYU4N5HL77MLF4FUX4VFKF6V

not attested not anchored not stored refs pending

The Atomic Hydrogen Content of Galaxies as a function of Group-Centric Radius

Barbara Catinella, Claudia del P. Lagos, Garima Chauhan, Lister Staveley-Smith, Luca Cortese, Tom Oosterloo, Wenkai Hu, Xuelei Chen

arxiv:2108.12712 v1 · 2021-08-28 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LDWYU4N5HL77MLF4FUX4VFKF6V}

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	2026-07-05T03:09:34.787823Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

58ed8a71bd3afff62cbc2d2fca9545f560203fd95cc3dd132c404e1712b76840

Aliases

arxiv: 2108.12712 · arxiv_version: 2108.12712v1 · doi: 10.48550/arxiv.2108.12712 · pith_short_12: LDWYU4N5HL77 · pith_short_16: LDWYU4N5HL77MLF4 · pith_short_8: LDWYU4N5

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/LDWYU4N5HL77MLF4FUX4VFKF6V \
  | 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: 58ed8a71bd3afff62cbc2d2fca9545f560203fd95cc3dd132c404e1712b76840

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7cb4465d2ccb151b870cdddc6dfe0663c55e1b7ab877b7d7a78d7a090968eb0a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2021-08-28T22:19:28Z",
    "title_canon_sha256": "82f661b41bec8d4e2898822b09ef8234cb463af55b2c932183d6dc28d24b9561"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2108.12712",
    "kind": "arxiv",
    "version": 1
  }
}