Pith Number

pith:OFDZBG26

pith:2020:OFDZBG26N73EHSB42KX24DJIML

not attested not anchored not stored refs pending

Risk scoring calculation for the current NHSx contact tracing app

Chris Holmes, Marcos Charalambides, Mark Briers

arxiv:2005.11057 v1 · 2020-05-22 · cs.CY · physics.soc-ph · q-bio.PE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OFDZBG26N73EHSB42KX24DJIML}

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	2026-07-05T01:05:05.085762Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7147909b5e6ff643c83cd2afae0d2862d712e270f148d4850c54baa28a3b5229

Aliases

arxiv: 2005.11057 · arxiv_version: 2005.11057v1 · doi: 10.48550/arxiv.2005.11057 · pith_short_12: OFDZBG26N73E · pith_short_16: OFDZBG26N73EHSB4 · pith_short_8: OFDZBG26

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/OFDZBG26N73EHSB42KX24DJIML \
  | 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: 7147909b5e6ff643c83cd2afae0d2862d712e270f148d4850c54baa28a3b5229

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fe4def356ca3268353e294613bca700064fd5f0c23afae5174d4aeb11e2bccbb",
    "cross_cats_sorted": [
      "physics.soc-ph",
      "q-bio.PE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CY",
    "submitted_at": "2020-05-22T08:39:46Z",
    "title_canon_sha256": "24901e7a7a0a435c78557806687fcaef57ea03de10692dbc6a8744da008af84f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2005.11057",
    "kind": "arxiv",
    "version": 1
  }
}