Pith Number

pith:ULU55OA6

pith:2019:ULU55OA6MPQ37EHJRTDGW2GPG3

not attested not anchored not stored refs pending

The formation of subdwarf A-type stars

Chunhua Zhu, Guoliang L\"u, Helei Liu, Jinlong Yu, Sufen Guo, Xuefei Chen, Zhanwen Han, Zhaojun Wang, Zhenwei Li

arxiv:1909.07591 v1 · 2019-09-17 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ULU55OA6MPQ37EHJRTDGW2GPG3}

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	2026-07-05T00:31:19.526592Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a2e9deb81e63e1bf90e98cc66b68cf36c11524e332a1a73fac5ba5612bc69bcd

Aliases

arxiv: 1909.07591 · arxiv_version: 1909.07591v1 · doi: 10.48550/arxiv.1909.07591 · pith_short_12: ULU55OA6MPQ3 · pith_short_16: ULU55OA6MPQ37EHJ · pith_short_8: ULU55OA6

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/ULU55OA6MPQ37EHJRTDGW2GPG3 \
  | 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: a2e9deb81e63e1bf90e98cc66b68cf36c11524e332a1a73fac5ba5612bc69bcd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b5f6c3c174a06542dcedad04d1cbd36b17647a0f35a4da59dc7048857bf716c6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2019-09-17T04:58:38Z",
    "title_canon_sha256": "31407147997eb992d921f03f07f8591151711e58093a1b85da0887b9fb38747a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.07591",
    "kind": "arxiv",
    "version": 1
  }
}