Pith Number

pith:U2KBEU4C

pith:2018:U2KBEU4CNGTYSM3FKOK646F2ZK

not attested not anchored not stored refs pending

Starspot activity of HD 199178. Doppler images from 1994--2017

Iya Ilyin, Jyri J. Lehtinen, Maarit J. K\"apyl\"a, Nikolai Piskunov, Oleg Kochukhov, Teemu Willamo, Thomas Hackman

arxiv:1812.02013 v2 · 2018-12-05 · 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{U2KBEU4CNGTYSM3FKOK646F2ZK}

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	2026-05-17T23:43:56.373353Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a69412538269a78933655395ee78bacab8b98b74d283587b3b93fddcae6b6ef8

Aliases

arxiv: 1812.02013 · arxiv_version: 1812.02013v2 · doi: 10.48550/arxiv.1812.02013 · pith_short_12: U2KBEU4CNGTY · pith_short_16: U2KBEU4CNGTYSM3F · pith_short_8: U2KBEU4C

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/U2KBEU4CNGTYSM3FKOK646F2ZK \
  | 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: a69412538269a78933655395ee78bacab8b98b74d283587b3b93fddcae6b6ef8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b1de4c93ee059bd2687f9ec4a942218d27900bf2a6cb7360b08cbdaff0dca756",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2018-12-05T14:28:21Z",
    "title_canon_sha256": "cbe2df40f38fa2fccd3a91fe40ca1cb8a19943484c74b3c966a40e6799d93be3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.02013",
    "kind": "arxiv",
    "version": 2
  }
}