Pith Number

pith:7QXEW4Q5

pith:2019:7QXEW4Q5E7XI4BLPAXKYCGSWC7

not attested not anchored not stored refs pending

Approximation algorithms and an integer program for multi-level graph spanners

Faryad Darabi Sahneh, Keaton Hamm, Mohammad Javad Latifi Jebelli, Reyan Ahmed, Richard Spence, Stephen Kobourov

arxiv:1904.01135 v1 · 2019-04-01 · cs.DM · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7QXEW4Q5E7XI4BLPAXKYCGSWC7}

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	2026-05-17T23:49:35.806351Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc2e4b721d27ee8e056f05d5811a5617e0f96d0b32fe8700bce91fbf9a08f10b

Aliases

arxiv: 1904.01135 · arxiv_version: 1904.01135v1 · doi: 10.48550/arxiv.1904.01135 · pith_short_12: 7QXEW4Q5E7XI · pith_short_16: 7QXEW4Q5E7XI4BLP · pith_short_8: 7QXEW4Q5

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/7QXEW4Q5E7XI4BLPAXKYCGSWC7 \
  | 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: fc2e4b721d27ee8e056f05d5811a5617e0f96d0b32fe8700bce91fbf9a08f10b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "217610038a15887cd43ee45c23bce30452ef8738de26e8f10564c8326a7f47f4",
    "cross_cats_sorted": [
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2019-04-01T22:48:08Z",
    "title_canon_sha256": "f1b815b9d1c502fee61b518fffada100bac5c174e2fdaeaa0cd16b05f6777d34"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1904.01135",
    "kind": "arxiv",
    "version": 1
  }
}