Pith Number

pith:OMF4KEA3

pith:2019:OMF4KEA3UI7BS7O7VAA5POCI5F

not attested not anchored not stored refs pending

Towards Directed Collapsibility

Brittany Terese Fasy, Catherine Ray, Elizabeth Vidaurre, Lisbeth Fajstrup, Nicole Sanderson, Robin Belton, Robyn Brooks, Stefania Ebli

arxiv:1902.01039 v2 · 2019-02-04 · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OMF4KEA3UI7BS7O7VAA5POCI5F}

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	2026-05-17T23:40:17.517774Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

730bc5101ba23e197ddfa801d7b848e95d45bc52a605ffeddd9e96ed338b5081

Aliases

arxiv: 1902.01039 · arxiv_version: 1902.01039v2 · doi: 10.48550/arxiv.1902.01039 · pith_short_12: OMF4KEA3UI7B · pith_short_16: OMF4KEA3UI7BS7O7 · pith_short_8: OMF4KEA3

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/OMF4KEA3UI7BS7O7VAA5POCI5F \
  | 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: 730bc5101ba23e197ddfa801d7b848e95d45bc52a605ffeddd9e96ed338b5081

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5c25d40c5f67ef9b7983b072d86f9c37325133b9c978990824a2b71c1a280b0e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AT",
    "submitted_at": "2019-02-04T05:40:12Z",
    "title_canon_sha256": "4d73eccf4894273c987c2d3b9ebd9e6b36134329bdecbfc047283e97fa17cb9c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.01039",
    "kind": "arxiv",
    "version": 2
  }
}