Pith Number

pith:BV4VMAG7

pith:2018:BV4VMAG7JDXTAXWWAQUMM4Q5ZA

not attested not anchored not stored refs pending

A collimated beam projector for precise telescope calibration

Christopher Stubbs, Chuck Claver, Kairn Brannon, Merlin Fisher-Levine, Michael Coughlin, Nicholas Mondrik, Patrick Ingraham, Peter Doherty, Robert Lupton, T. M. C. Abbott

arxiv:1805.05867 v1 · 2018-05-15 · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BV4VMAG7JDXTAXWWAQUMM4Q5ZA}

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	2026-05-18T00:15:53.433742Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0d795600df48ef305ed60428c6721dc80716f7346f6502138568e1455ed8ce1c

Aliases

arxiv: 1805.05867 · arxiv_version: 1805.05867v1 · doi: 10.48550/arxiv.1805.05867 · pith_short_12: BV4VMAG7JDXT · pith_short_16: BV4VMAG7JDXTAXWW · pith_short_8: BV4VMAG7

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/BV4VMAG7JDXTAXWWAQUMM4Q5ZA \
  | 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: 0d795600df48ef305ed60428c6721dc80716f7346f6502138568e1455ed8ce1c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f5356975e4f0fd8e8d90c854e42057f29bbccb188283141e116990878fa4afaa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2018-05-15T16:01:26Z",
    "title_canon_sha256": "e7f104d3fcd617044042a38417923cd63401fe174f8f0570d6ffeeeb52cc162f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.05867",
    "kind": "arxiv",
    "version": 1
  }
}