Pith Number

pith:SFDPBBLK

pith:2015:SFDPBBLKPJZM4S4GAIHBCGCCU4

not attested not anchored not stored refs pending

Improved Approximation Algorithms for Relay Placement

Alon Efrat, Joseph S. B. Mitchell, Jukka Suomela, S\'andor P. Fekete, Valentin Polishchuk

arxiv:1511.02525 v1 · 2015-11-08 · 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{SFDPBBLKPJZM4S4GAIHBCGCCU4}

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	2026-05-18T01:27:30.022783Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9146f0856a7a72ce4b86020e111842a7091d06280aa7eb03742786edc0eb11f7

Aliases

arxiv: 1511.02525 · arxiv_version: 1511.02525v1 · doi: 10.48550/arxiv.1511.02525 · pith_short_12: SFDPBBLKPJZM · pith_short_16: SFDPBBLKPJZM4S4G · pith_short_8: SFDPBBLK

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/SFDPBBLKPJZM4S4GAIHBCGCCU4 \
  | 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: 9146f0856a7a72ce4b86020e111842a7091d06280aa7eb03742786edc0eb11f7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "045f2bce15b573133d30eea2ba0a8dcb991db0c4674d64db31c9538e679b86de",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2015-11-08T20:58:12Z",
    "title_canon_sha256": "d4e074d63a3820812aa5455080ceac1a4f8c74bd15fd8a40979f5590abd29347"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1511.02525",
    "kind": "arxiv",
    "version": 1
  }
}