Pith Number

pith:2XH5RVE3

pith:2018:2XH5RVE3TXMLVRGC3UNBZDQRQJ

not attested not anchored not stored refs pending

Extraplanar H II Regions in Spiral Galaxies. I. Low-Metallicity Gas Accreting through the Disk-Halo Interface of NGC 4013

Blair D. Savage, Christopher B. Wotta, J. Christopher Howk, Katherine M. Rueff, Kevin Croxall, Nicolas Lehner

arxiv:1802.10165 v2 · 2018-02-27 · 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{2XH5RVE3TXMLVRGC3UNBZDQRQJ}

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	2026-05-18T00:17:38.580820Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5cfd8d49b9dd8bac4c2dd1a1c8e118242ad9afa0f87213c27b27174db506560

Aliases

arxiv: 1802.10165 · arxiv_version: 1802.10165v2 · doi: 10.48550/arxiv.1802.10165 · pith_short_12: 2XH5RVE3TXML · pith_short_16: 2XH5RVE3TXMLVRGC · pith_short_8: 2XH5RVE3

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/2XH5RVE3TXMLVRGC3UNBZDQRQJ \
  | 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: d5cfd8d49b9dd8bac4c2dd1a1c8e118242ad9afa0f87213c27b27174db506560

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "213e60637275122e172e37dce17b1b96674005fcc4de539be0ae12cc4aa7ac36",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-02-27T21:10:25Z",
    "title_canon_sha256": "95e8d0b2da3a18917b99063687ce034b454dd1ca0f62eabb7fac053f97c6b795"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.10165",
    "kind": "arxiv",
    "version": 2
  }
}