Pith Number

pith:CK63NOZY

pith:2018:CK63NOZYEKNN53EC5MJE73HKW5

not attested not anchored not stored refs pending

Buy your coffee with bitcoin: Real-world deployment of a bitcoin point of sale terminal

Abdelwahab Hamou-Lhadj, Jeremy Clark, Shayan Eskandari

arxiv:1802.04236 v1 · 2018-02-12 · cs.CR · cs.CY · cs.ET · cs.HC · cs.SI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CK63NOZYEKNN53EC5MJE73HKW5}

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	2026-05-18T00:23:46.456813Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

12bdb6bb38229adeec82eb124feceab75d624159c3302a93ea62ab1eae7b70c7

Aliases

arxiv: 1802.04236 · arxiv_version: 1802.04236v1 · doi: 10.48550/arxiv.1802.04236 · pith_short_12: CK63NOZYEKNN · pith_short_16: CK63NOZYEKNN53EC · pith_short_8: CK63NOZY

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/CK63NOZYEKNN53EC5MJE73HKW5 \
  | 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: 12bdb6bb38229adeec82eb124feceab75d624159c3302a93ea62ab1eae7b70c7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2c37a237d203b6f4ade7fccc0446fe8e9fac0fb63e05dba6af73f438bf7e5fc7",
    "cross_cats_sorted": [
      "cs.CY",
      "cs.ET",
      "cs.HC",
      "cs.SI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2018-02-12T18:38:35Z",
    "title_canon_sha256": "86da3b173823f28b835a1e9dd024d966f54997ac9bb3ea8baa12b5802a35a40c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.04236",
    "kind": "arxiv",
    "version": 1
  }
}