Pith Number

pith:VJTQDROV

pith:2020:VJTQDROVX3EM6SCCZZE5EX5ZOB

not attested not anchored not stored refs pending

A note on blind contact tracing at scale with applications to the COVID-19 pandemic

Atul Mantri, Jack K. Fitzsimons, Robert Pisarczyk, Tom Rainforth, Zhikuan Zhao

arxiv:2004.05116 v1 · 2020-04-10 · cs.CR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VJTQDROVX3EM6SCCZZE5EX5ZOB}

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	2026-07-05T00:54:25.444897Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aa6701c5d5bec8cf4842ce49d25fb9704d0f85dfaa53673cd49664c8f4b3196a

Aliases

arxiv: 2004.05116 · arxiv_version: 2004.05116v1 · doi: 10.48550/arxiv.2004.05116 · pith_short_12: VJTQDROVX3EM · pith_short_16: VJTQDROVX3EM6SCC · pith_short_8: VJTQDROV

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/VJTQDROVX3EM6SCCZZE5EX5ZOB \
  | 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: aa6701c5d5bec8cf4842ce49d25fb9704d0f85dfaa53673cd49664c8f4b3196a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "361a615bc1527610102d815f5e5a486f9620a47cc2253e106c28edf62854b831",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2020-04-10T16:54:45Z",
    "title_canon_sha256": "3011f833fbf4f0f8ccb582500c46970ec5b85a4a654763cb41c31b22532d0556"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.05116",
    "kind": "arxiv",
    "version": 1
  }
}