Pith Number

pith:DQVYVBMT

pith:2009:DQVYVBMTFQ2OOUUZ2KSQRTPDKH

not attested not anchored not stored refs pending

The evolution of planetary nebulae VI. On the chemical composition of the metal-poor PN G135.9+55.9

C. Sandin, D. Sch\"onberner, M.M. Roth, M. Steffen, R. Jacob

arxiv:0912.5430 v1 · 2009-12-30 · 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{DQVYVBMTFQ2OOUUZ2KSQRTPDKH}

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	2026-05-18T02:33:50.484391Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1c2b8a85932c34e75299d2a508cde351c7a9dc1aa9e3d260983a697d85d73d84

Aliases

arxiv: 0912.5430 · arxiv_version: 0912.5430v1 · doi: 10.48550/arxiv.0912.5430 · pith_short_12: DQVYVBMTFQ2O · pith_short_16: DQVYVBMTFQ2OOUUZ · pith_short_8: DQVYVBMT

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/DQVYVBMTFQ2OOUUZ2KSQRTPDKH \
  | 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: 1c2b8a85932c34e75299d2a508cde351c7a9dc1aa9e3d260983a697d85d73d84

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9263f79cfabdb76c0982972e86acd12f0a52961cff61148cc1b66b58d92fccc8",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/3.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-12-30T13:59:04Z",
    "title_canon_sha256": "6a2799843efa598bea6d77d8008589bf722d522053e11f0869095c976129e535"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.5430",
    "kind": "arxiv",
    "version": 1
  }
}