Pith Number

pith:YD4F5QNU

pith:2018:YD4F5QNU3V5XQRJ5RRCIIBNCJ3

not attested not anchored not stored refs pending

The validity of RFID badges measuring face-to-face interactions

Christoph Stadtfeld, Krishna Chaitanya, Prateek Purwar, Timon Elmer

arxiv:1811.12189 v2 · 2018-11-28 · cs.CY

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YD4F5QNU3V5XQRJ5RRCIIBNCJ3}

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	2026-05-17T23:48:16.908206Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c0f85ec1b4dd7b78453d8c448405a24edfe8fb8ee42bd30070f701dccd75cfe3

Aliases

arxiv: 1811.12189 · arxiv_version: 1811.12189v2 · doi: 10.48550/arxiv.1811.12189 · pith_short_12: YD4F5QNU3V5X · pith_short_16: YD4F5QNU3V5XQRJ5 · pith_short_8: YD4F5QNU

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/YD4F5QNU3V5XQRJ5RRCIIBNCJ3 \
  | 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: c0f85ec1b4dd7b78453d8c448405a24edfe8fb8ee42bd30070f701dccd75cfe3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c16e622b75366be26b4314f86c2d4cc04ac5766235c33c6062bf68ed1ca3993e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CY",
    "submitted_at": "2018-11-28T10:14:58Z",
    "title_canon_sha256": "895a6a38e20a72d9bad7b77c5c060633d73d7f79c3952ef8e43315d3fd5df4bd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.12189",
    "kind": "arxiv",
    "version": 2
  }
}