Pith Number

pith:IF6VDJEM

pith:2008:IF6VDJEMS4EYS356YDM6YVITHI

not attested not anchored not stored refs pending

Was the Universe neutral beyond redshift six?

A. Ferrara, Choudhury T. Roy, R. Salvaterra, S. Gallerani, X. Fan

arxiv:0801.4674 v2 · 2008-01-30 · 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{IF6VDJEMS4EYS356YDM6YVITHI}

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	2026-05-18T04:36:41.499198Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

417d51a48c9709896fbec0d9ec55133a32d98e3f64dbe839b91f462ed497d5a5

Aliases

arxiv: 0801.4674 · arxiv_version: 0801.4674v2 · doi: 10.48550/arxiv.0801.4674 · pith_short_12: IF6VDJEMS4EY · pith_short_16: IF6VDJEMS4EYS356 · pith_short_8: IF6VDJEM

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/IF6VDJEMS4EYS356YDM6YVITHI \
  | 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: 417d51a48c9709896fbec0d9ec55133a32d98e3f64dbe839b91f462ed497d5a5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1a27bbac56b3ba5fa4ba0b5d7a4592750a4e136adb53376f6411988a527d6b00",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-01-30T14:10:08Z",
    "title_canon_sha256": "4b32e9e93bd25224310f5ee4aaf71e8de17e99273db221a572ad977e0efd8475"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0801.4674",
    "kind": "arxiv",
    "version": 2
  }
}