Pith Number

pith:2U2GGJ7T

pith:2019:2U2GGJ7TZ2FGYP2RSSJ5CATKZA

not attested not anchored not stored refs pending

Earth as an Exoplanet: A Two-dimensional Alien Map

Cheng Li, David Crisp, Jia-Zheng Li, Jonathan H. Jiang, Siteng Fan, Stuart Bartlett, Vijay Natraj, Yuk L. Yung

arxiv:1908.04350 v1 · 2019-08-12 · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2U2GGJ7TZ2FGYP2RSSJ5CATKZA}

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	2026-07-05T00:00:27.764494Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be

Aliases

arxiv: 1908.04350 · arxiv_version: 1908.04350v1 · doi: 10.48550/arxiv.1908.04350 · pith_short_12: 2U2GGJ7TZ2FG · pith_short_16: 2U2GGJ7TZ2FGYP2R · pith_short_8: 2U2GGJ7T

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/2U2GGJ7TZ2FGYP2RSSJ5CATKZA \
  | 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: d5346327f3ce8a6c3f519493d1026ac80b08dd220b2aa45852cc8b1e034911be

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "231c6de70d0f212fd2cc2cadf27d384af9b6a14d8b459dd9adc573e224f21019",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2019-08-12T19:29:19Z",
    "title_canon_sha256": "44598013206c4cb3d3409f82617b7d8fa8804da12953a7c619b56ab99fde6e19"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.04350",
    "kind": "arxiv",
    "version": 1
  }
}