Pith Number

pith:JNPSFVBU

pith:2013:JNPSFVBUAH3CSWMHV2OMQJHXKX

not attested not anchored not stored refs pending

Unobtrusive Low Cost Pupil Size Measurements using Web cameras

Costantine D. Spyropoulos, Sergios Petridis, Theodoros Giannakopoulos

arxiv:1311.7327 v1 · 2013-11-28 · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{JNPSFVBUAH3CSWMHV2OMQJHXKX}

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	2026-05-18T03:05:56.592391Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4b5f22d43401f6295987ae9cc824f755ecbf6efe6e97371641cf7238d933255b

Aliases

arxiv: 1311.7327 · arxiv_version: 1311.7327v1 · doi: 10.48550/arxiv.1311.7327 · pith_short_12: JNPSFVBUAH3C · pith_short_16: JNPSFVBUAH3CSWMH · pith_short_8: JNPSFVBU

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/JNPSFVBUAH3CSWMHV2OMQJHXKX \
  | 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: 4b5f22d43401f6295987ae9cc824f755ecbf6efe6e97371641cf7238d933255b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "020f499e6bc445b828c251d5f35afd8fd5419944231f66758d56b9331384e984",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2013-11-28T14:25:43Z",
    "title_canon_sha256": "43204dd424b9298773322a5b943ff8beddfa91f0dc3a0bbb05580816367475f3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1311.7327",
    "kind": "arxiv",
    "version": 1
  }
}