Pith Number

pith:XWP63HHQ

pith:2020:XWP63HHQKUUEOR22YZHVLZ7RW2

not attested not anchored not stored refs pending

Bluetooth Smartphone Apps: Are they the most private and effective solution for COVID-19 contact tracing?

Evangelia Kyrimi, Graham A Hitman, Kudakwashe Dube, Magda Osman, Martin Neil, Norman E Fenton, Peter Lucas, Scott McLachlan

arxiv:2005.06621 v2 · 2020-05-08 · 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{XWP63HHQKUUEOR22YZHVLZ7RW2}

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	2026-07-05T01:03:00.120490Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bd9fed9cf0552847475ac64f55e7f1b6a368f185da2e90c8287b2b194e5ff1eb

Aliases

arxiv: 2005.06621 · arxiv_version: 2005.06621v2 · doi: 10.48550/arxiv.2005.06621 · pith_short_12: XWP63HHQKUUE · pith_short_16: XWP63HHQKUUEOR22 · pith_short_8: XWP63HHQ

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/XWP63HHQKUUEOR22YZHVLZ7RW2 \
  | 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: bd9fed9cf0552847475ac64f55e7f1b6a368f185da2e90c8287b2b194e5ff1eb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "300cbb8b3c359a80dd4285bcb1cdc234baf126b5f91963042db93a3957c2768f",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CY",
    "submitted_at": "2020-05-08T07:07:00Z",
    "title_canon_sha256": "b12b53a1ed65dd359a2acd3b9135cba50a601972a7f79174c4118b82bcddf7b8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2005.06621",
    "kind": "arxiv",
    "version": 2
  }
}