Pith Number

pith:DXHE5QI4

pith:2019:DXHE5QI4MVBURSVDQFS3GH3OKB

not attested not anchored not stored refs pending

A Lighthouse Illumination Problem

Erhan Tezcan

arxiv:1903.09001 v1 · 2019-03-20 · math.HO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DXHE5QI4MVBURSVDQFS3GH3OKB}

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	2026-05-17T23:50:43.361750Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1dce4ec11c654348caa38165b31f6e50445cb2229d06084ac560f5110c6747c2

Aliases

arxiv: 1903.09001 · arxiv_version: 1903.09001v1 · doi: 10.48550/arxiv.1903.09001 · pith_short_12: DXHE5QI4MVBU · pith_short_16: DXHE5QI4MVBURSVD · pith_short_8: DXHE5QI4

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/DXHE5QI4MVBURSVDQFS3GH3OKB \
  | 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: 1dce4ec11c654348caa38165b31f6e50445cb2229d06084ac560f5110c6747c2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d1685b570a322b84fc7c786d2eec68d213042d09788418a08e41f28111d8997e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2019-03-20T09:04:16Z",
    "title_canon_sha256": "957679151bba30bcbee801c30d6caf6c5efa1030733128a6ff1b4277279403af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.09001",
    "kind": "arxiv",
    "version": 1
  }
}