Pith Number

pith:7QPVVUBG

pith:2021:7QPVVUBG6O4M6M6JT2V52TCZYS

not attested not anchored not stored refs pending

Real Masks and Spoof Faces: On the Masked Face Presentation Attack Detection

Arjan Kuijper, Florian Kirchbuchner, Meiling Fang, Naser Damer

arxiv:2103.01546 v2 · 2021-03-02 · 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{7QPVVUBG6O4M6M6JT2V52TCZYS}

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	2026-07-05T03:27:29.569542Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc1f5ad026f3b8cf33c99eabdd4c59c4a570476c537ffbb44e9f9564f7c5100f

Aliases

arxiv: 2103.01546 · arxiv_version: 2103.01546v2 · doi: 10.48550/arxiv.2103.01546 · pith_short_12: 7QPVVUBG6O4M · pith_short_16: 7QPVVUBG6O4M6M6J · pith_short_8: 7QPVVUBG

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/7QPVVUBG6O4M6M6JT2V52TCZYS \
  | 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: fc1f5ad026f3b8cf33c99eabdd4c59c4a570476c537ffbb44e9f9564f7c5100f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3f8829a771a6ee3e8516b2038e356854de52b3aa22eec84637608b9f9450ca8a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2021-03-02T08:05:50Z",
    "title_canon_sha256": "853f1291fa299570785ee14077c9fba335dc9d69a320bacabc62019aca1eb2f4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2103.01546",
    "kind": "arxiv",
    "version": 2
  }
}