Pith Number

pith:VTQXBDJW

pith:2020:VTQXBDJWS4XQP43SIMP427JJYR

not attested not anchored not stored refs pending

Bayesian data assimilation for estimating epidemic evolution: a COVID-19 study

Karl J. Friston, Ling Li, Richard Yi Da Xu, Shuo Wang, Xian Yang, Yike Guo, Yuting Xing

arxiv:2101.01532 v2 · 2020-12-22 · stat.AP · physics.bio-ph · 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{VTQXBDJWS4XQP43SIMP427JJYR}

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	2026-07-05T03:25:11.930753Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ace1708d36972f07f372431fcd7d29c451f286313edd7ce2eb43f1ffdf0ea7b7

Aliases

arxiv: 2101.01532 · arxiv_version: 2101.01532v2 · doi: 10.48550/arxiv.2101.01532 · pith_short_12: VTQXBDJWS4XQ · pith_short_16: VTQXBDJWS4XQP43S · pith_short_8: VTQXBDJW

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/VTQXBDJWS4XQP43SIMP427JJYR \
  | 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: ace1708d36972f07f372431fcd7d29c451f286313edd7ce2eb43f1ffdf0ea7b7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "40111f45cbe8df3a42d17d4f0a84bd138a38db7b5ba848d37faeb20443ee5476",
    "cross_cats_sorted": [
      "physics.bio-ph",
      "physics.soc-ph",
      "q-bio.PE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.AP",
    "submitted_at": "2020-12-22T07:38:35Z",
    "title_canon_sha256": "4d4d5c8b704a4f3d3ed4f4aa9e7e8f0cb19af0785ca441918d3b0abd626a07dc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2101.01532",
    "kind": "arxiv",
    "version": 2
  }
}