Pith Number

pith:QYL22H35

pith:1997:QYL22H35CRWUADV4F2H2JQ2A7C

not attested not anchored not stored refs pending

New Protostellar Collapse Candidates: An HCO+ Survey of the Class 0 Sources

Erik M. Gregersen, Minho Choi, Neal J. Evans II, Shudong Zhou

arxiv:astro-ph/9702171 v1 · 1997-02-20 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QYL22H35CRWUADV4F2H2JQ2A7C}

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	2026-07-04T16:02:52.809553Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8617ad1f7d146d400ebc2e8fa4c340f8adf774463ed26d6f13d06ec54ead4968

Aliases

arxiv: astro-ph/9702171 · arxiv_version: astro-ph/9702171v1 · doi: 10.48550/arxiv.astro-ph/9702171 · pith_short_12: QYL22H35CRWU · pith_short_16: QYL22H35CRWUADV4 · pith_short_8: QYL22H35

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/QYL22H35CRWUADV4F2H2JQ2A7C \
  | 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: 8617ad1f7d146d400ebc2e8fa4c340f8adf774463ed26d6f13d06ec54ead4968

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "94c5ec4b95781f1fdcb47874ed61c2e2140307b4109e074c70d9c28cf04130d1",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1997-02-20T03:07:31Z",
    "title_canon_sha256": "f95ff3a40944d443d5a785309c482089e202b4a1461b9d2b3b2f475dabfde2b8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9702171",
    "kind": "arxiv",
    "version": 1
  }
}