Pith Number

pith:IMG3MMQ7

pith:2021:IMG3MMQ7RICB5CS7VS7CUOINUL

not attested not anchored not stored refs pending

COVID-19 Digital Contact Tracing Applications and Techniques: A Review Post Initial Deployments

Farooq Ahmad, Junaid Qadir, Maged N. Kamel Boulos, Muhammad Shahroz, Muhammad Shahzad Younis, Nadeem Ahmad, Ricardo Vinuesa

arxiv:2103.01766 v1 · 2021-02-25 · 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{IMG3MMQ7RICB5CS7VS7CUOINUL}

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	2026-07-05T02:19:50.437097Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

430db6321f8a041e8a5facbe2a390da2cbb8b0188161f6cf489c60a1610f84ad

Aliases

arxiv: 2103.01766 · arxiv_version: 2103.01766v1 · doi: 10.48550/arxiv.2103.01766 · pith_short_12: IMG3MMQ7RICB · pith_short_16: IMG3MMQ7RICB5CS7 · pith_short_8: IMG3MMQ7

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/IMG3MMQ7RICB5CS7VS7CUOINUL \
  | 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: 430db6321f8a041e8a5facbe2a390da2cbb8b0188161f6cf489c60a1610f84ad

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3f5b453fceee7eafd352a40cb613a6b6a94d029fd5e753b47bf2fd8c925f7c27",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CY",
    "submitted_at": "2021-02-25T10:18:40Z",
    "title_canon_sha256": "e07fb1fe8941c290acf4ae409b00e5c3a178386dd5b57051565b1875a4f30bd1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2103.01766",
    "kind": "arxiv",
    "version": 1
  }
}