Pith Number

pith:V7TMCINL

pith:2018:V7TMCINLPIQONOGL22RT2QSE2P

not attested not anchored not stored refs pending

Early evolution of purple retinal pigments on Earth and implications for exoplanet biosignatures

Edward W. Schwieterman, Shiladitya DasSarma

arxiv:1810.05150 v1 · 2018-10-11 · 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{V7TMCINLPIQONOGL22RT2QSE2P}

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	2026-05-18T00:03:34.784664Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

afe6c121ab7a20e6b8cbd6a33d4244d3e1c12e2b0d070c11e6368ebd9b227029

Aliases

arxiv: 1810.05150 · arxiv_version: 1810.05150v1 · doi: 10.48550/arxiv.1810.05150 · pith_short_12: V7TMCINLPIQO · pith_short_16: V7TMCINLPIQONOGL · pith_short_8: V7TMCINL

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/V7TMCINLPIQONOGL22RT2QSE2P \
  | 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: afe6c121ab7a20e6b8cbd6a33d4244d3e1c12e2b0d070c11e6368ebd9b227029

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9576087808eb4cd9c11f2c1fb11f3dfb92899bdf36d86c1ef856e025e3a90dbc",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2018-10-11T17:51:41Z",
    "title_canon_sha256": "737747bf877ee330bd7a548d427607d0087f8fea16a3725d791a6cfb985c04d7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.05150",
    "kind": "arxiv",
    "version": 1
  }
}