Pith Number

pith:RYUAYHTM

pith:2008:RYUAYHTMBQ4FSTTXZDXJMHQ4KW

not attested not anchored not stored refs pending

New period-luminosity and period-color relations of classical Cepheids: III. Cepheids in SMC

(2) Department of Physics, A. Sandage (1), Astronomy, B. Reindl (2) ((1) Obs. Carnegie Inst. Washington, G.A. Tammann (2), Univ. of Basel)

arxiv:0810.1780 v1 · 2008-10-09 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RYUAYHTMBQ4FSTTXZDXJMHQ4KW}

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	2026-07-04T17:13:09.335767Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8e280c1e6c0c38594e77c8ee961e1c55ae6a04ba159e0332c5684d07deeedb13

Aliases

arxiv: 0810.1780 · arxiv_version: 0810.1780v1 · doi: 10.48550/arxiv.0810.1780 · pith_short_12: RYUAYHTMBQ4F · pith_short_16: RYUAYHTMBQ4FSTTX · pith_short_8: RYUAYHTM

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/RYUAYHTMBQ4FSTTXZDXJMHQ4KW \
  | 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: 8e280c1e6c0c38594e77c8ee961e1c55ae6a04ba159e0332c5684d07deeedb13

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b154af924785d144946b8bf4af17b22f53f30208f3888b2ebe18ece0c947a08e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-10-09T23:20:55Z",
    "title_canon_sha256": "2c2bbacd4898d6ffe1af539b64dc7a453a13c0aefbae0e58a1b4c34838f293fc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0810.1780",
    "kind": "arxiv",
    "version": 1
  }
}