Pith Number

pith:WNP7Q3O2

pith:2010:WNP7Q3O27TBXRCK5M3GHP7DZ7W

not attested not anchored not stored refs pending

Reply to Flambaum and Porsev comment on "21 cm radiation - a new probe of variation in the fine structure constant"

Benjamin D. Wandelt, Rishi Khatri

arxiv:1007.1963 v1 · 2010-07-12 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WNP7Q3O27TBXRCK5M3GHP7DZ7W}

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	2026-05-18T02:33:09.287009Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b35ff86ddafcc378895d66cc77fc79fd851745e99ef78ce5ec64cd92a65e770d

Aliases

arxiv: 1007.1963 · arxiv_version: 1007.1963v1 · doi: 10.48550/arxiv.1007.1963 · pith_short_12: WNP7Q3O27TBX · pith_short_16: WNP7Q3O27TBXRCK5 · pith_short_8: WNP7Q3O2

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/WNP7Q3O27TBXRCK5M3GHP7DZ7W \
  | 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: b35ff86ddafcc378895d66cc77fc79fd851745e99ef78ce5ec64cd92a65e770d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3baa87fc8f223e76bcfec863e2d815f9d3f8e10d0129020336e22d12a665f449",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-07-12T19:22:51Z",
    "title_canon_sha256": "7ace918eda699f52423eaac003be31a7f269b280b2427ef578f70a593147bf8a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1007.1963",
    "kind": "arxiv",
    "version": 1
  }
}