Pith Number

pith:RWEYJL7I

pith:2015:RWEYJL7ISNKQX5G6MYKJIZT2ES

not attested not anchored not stored refs pending

Hardness of RNA Folding Problem with Four Symbols

Yi-Jun Chang

arxiv:1511.04731 v3 · 2015-11-15 · cs.CC · 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{RWEYJL7ISNKQX5G6MYKJIZT2ES}

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	2026-05-18T00:20:27.816756Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8d8984afe893550bf4de661494667a2493465830ff671f6f0f234a2c05f1c32c

Aliases

arxiv: 1511.04731 · arxiv_version: 1511.04731v3 · doi: 10.48550/arxiv.1511.04731 · pith_short_12: RWEYJL7ISNKQ · pith_short_16: RWEYJL7ISNKQX5G6 · pith_short_8: RWEYJL7I

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/RWEYJL7ISNKQX5G6MYKJIZT2ES \
  | 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: 8d8984afe893550bf4de661494667a2493465830ff671f6f0f234a2c05f1c32c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2dda7dca47f6160aa4677cd8454774d3569732b6c27d156086851b51c005085f",
    "cross_cats_sorted": [
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2015-11-15T17:09:26Z",
    "title_canon_sha256": "0fb3e1e54916f769fea8ad6c8207be7d9bd58544be6acd2bb684765e375ec850"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1511.04731",
    "kind": "arxiv",
    "version": 3
  }
}