Pith Number

pith:OSNLNSCJ

pith:2026:OSNLNSCJWURO6EOKWMZMRALB2E

not attested not anchored not stored refs pending

Hardness and Approximation for Coloring Digraphs

Alantha Newman, Chaoliang Tang, Felix Klingelhoefer, Harmender Gahlawat, Parinya Chalermsook

arxiv:2605.19654 v1 · 2026-05-19 · 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{OSNLNSCJWURO6EOKWMZMRALB2E}

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	2026-05-20T01:05:56.093389Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

749ab6c849b522ef11cab332c88161d12ed7ae5ae2892986d8f7e808191f7340

Aliases

arxiv: 2605.19654 · arxiv_version: 2605.19654v1 · doi: 10.48550/arxiv.2605.19654 · pith_short_12: OSNLNSCJWURO · pith_short_16: OSNLNSCJWURO6EOK · pith_short_8: OSNLNSCJ

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/OSNLNSCJWURO6EOKWMZMRALB2E \
  | 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: 749ab6c849b522ef11cab332c88161d12ed7ae5ae2892986d8f7e808191f7340

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dc0947923ca8e7dac163ca753000a76c66406f0b85e8c0475740e55a4d116d5f",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2026-05-19T10:44:44Z",
    "title_canon_sha256": "6ea7c1685376684588b3c83577b4c71b18152b3cfb0a83e3c72fa8fc3ff6bbd3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.19654",
    "kind": "arxiv",
    "version": 1
  }
}