Pith Number

pith:7A3O2KVW

pith:2019:7A3O2KVW7XXI7ULWSWHCG35VPF

not attested not anchored not stored refs pending

Determination of Starspot Covering Fraction as a function of Stellar Age from Observational Data

Eric G. Blackman, Fiona Nichols-Fleming

arxiv:1909.03183 v2 · 2019-09-07 · astro-ph.SR · 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{7A3O2KVW7XXI7ULWSWHCG35VPF}

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	2026-07-05T00:31:56.806561Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f836ed2ab6fdee8fd176958e236fb5797f98ecd95223be9db5192cc36a462f32

Aliases

arxiv: 1909.03183 · arxiv_version: 1909.03183v2 · doi: 10.48550/arxiv.1909.03183 · pith_short_12: 7A3O2KVW7XXI · pith_short_16: 7A3O2KVW7XXI7ULW · pith_short_8: 7A3O2KVW

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/7A3O2KVW7XXI7ULWSWHCG35VPF \
  | 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: f836ed2ab6fdee8fd176958e236fb5797f98ecd95223be9db5192cc36a462f32

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b18749269296ff14c669d2c3691b4cc345a1fc319b94d9343c2aa6adba66163e",
    "cross_cats_sorted": [
      "astro-ph.EP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2019-09-07T03:51:32Z",
    "title_canon_sha256": "1546947504a306c69c22c1c3a2fd3eaa6e33b4831be5c83bdc615eefce8d0dcf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.03183",
    "kind": "arxiv",
    "version": 2
  }
}