Pith Number

pith:PDF4NHL5

pith:2020:PDF4NHL5Z4JIQQ6KQOK7OUMVFI

not attested not anchored not stored refs pending

Some fractal thoughts about the COVID-19 infection outbreak

Massimo Materassi

arxiv:2004.04819 v1 · 2020-04-08 · q-bio.PE · math.DS · physics.bio-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PDF4NHL5Z4JIQQ6KQOK7OUMVFI}

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	2026-07-05T00:54:14.534630Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78cbc69d7dcf128843ca8395f751952a15c916c14145039576131d3875c4c035

Aliases

arxiv: 2004.04819 · arxiv_version: 2004.04819v1 · doi: 10.48550/arxiv.2004.04819 · pith_short_12: PDF4NHL5Z4JI · pith_short_16: PDF4NHL5Z4JIQQ6K · pith_short_8: PDF4NHL5

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/PDF4NHL5Z4JIQQ6KQOK7OUMVFI \
  | 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: 78cbc69d7dcf128843ca8395f751952a15c916c14145039576131d3875c4c035

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb5dbef6bbba689542f433e39b34ee56c3b1435f84d749beac69a0a5af41139e",
    "cross_cats_sorted": [
      "math.DS",
      "physics.bio-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "q-bio.PE",
    "submitted_at": "2020-04-08T16:52:05Z",
    "title_canon_sha256": "fe3258aed8492f751aaf38f58864b0115bdf36861eae9c1ca0205ea619814af3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.04819",
    "kind": "arxiv",
    "version": 1
  }
}