Pith Number

pith:H7SWHZIH

pith:2012:H7SWHZIHVOPWHVHQT3LLW2KRFX

not attested not anchored not stored refs pending

A colouring protocol for the generalized Russian cards problem

Andr\'es Cord\'on-Franco, David Fern\'andez-Duque, Fernando Soler-Toscano, Hans van Ditmarsch

arxiv:1207.5216 v4 · 2012-07-22 · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{H7SWHZIHVOPWHVHQT3LLW2KRFX}

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	2026-05-18T02:55:36.611828Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3fe563e507ab9f63d4f09ed6bb69512dda164859e26e41ab6c54a2f8dc4bc9ae

Aliases

arxiv: 1207.5216 · arxiv_version: 1207.5216v4 · doi: 10.48550/arxiv.1207.5216 · pith_short_12: H7SWHZIHVOPW · pith_short_16: H7SWHZIHVOPWHVHQ · pith_short_8: H7SWHZIH

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/H7SWHZIHVOPWHVHQT3LLW2KRFX \
  | 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: 3fe563e507ab9f63d4f09ed6bb69512dda164859e26e41ab6c54a2f8dc4bc9ae

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ce238cacf655c5adf0a4e66cfe3b47910409e2fb879edda279db57f2cba89cc4",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2012-07-22T11:06:17Z",
    "title_canon_sha256": "2fa59e3d7c82373545e13af97ff364410119ad9bd1e17d664061404815bc8323"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.5216",
    "kind": "arxiv",
    "version": 4
  }
}