Pith Number

pith:5WX2O2K7

pith:2022:5WX2O2K7YWLXKFFF7GMSUIMFRG

not attested not anchored not stored refs pending

Oxygen-enhanced extremely metal-poor DLAs: A signpost of the first stars?

Louise Welsh, Max Pettini, Michele Fumagalli, Ryan Cooke

arxiv:2201.08394 v1 · 2022-01-20 · 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{5WX2O2K7YWLXKFFF7GMSUIMFRG}

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	2026-07-05T04:19:52.518680Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

edafa7695fc5977514a5f9992a218589baa14f93e227d55f6ae220e27c29c164

Aliases

arxiv: 2201.08394 · arxiv_version: 2201.08394v1 · doi: 10.48550/arxiv.2201.08394 · pith_short_12: 5WX2O2K7YWLX · pith_short_16: 5WX2O2K7YWLXKFFF · pith_short_8: 5WX2O2K7

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/5WX2O2K7YWLXKFFF7GMSUIMFRG \
  | 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: edafa7695fc5977514a5f9992a218589baa14f93e227d55f6ae220e27c29c164

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "43293fb130659829f6326f73907e7f6d5665a81429d020a8ef641a060bfa9c8f",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2022-01-20T19:00:00Z",
    "title_canon_sha256": "ca20b9c944bc10c85e76705e8bd5f21f5b03e7ea8773ffbada287651f6cada95"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2201.08394",
    "kind": "arxiv",
    "version": 1
  }
}