Pith Number

pith:I5YWDV53

pith:2019:I5YWDV53VXKIWBVGCXL5VUCBK4

not attested not anchored not stored refs pending

Counting Immutable Beans: Reference Counting Optimized for Purely Functional Programming

Leonardo de Moura, Sebastian Ullrich

arxiv:1908.05647 v3 · 2019-08-15 · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{I5YWDV53VXKIWBVGCXL5VUCBK4}

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	2026-07-05T00:45:52.009912Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

477161d7bbadd48b06a615d7dad04157113b043152c06a5e5e3caaa62178ff0a

Aliases

arxiv: 1908.05647 · arxiv_version: 1908.05647v3 · doi: 10.48550/arxiv.1908.05647 · pith_short_12: I5YWDV53VXKI · pith_short_16: I5YWDV53VXKIWBVG · pith_short_8: I5YWDV53

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/I5YWDV53VXKIWBVGCXL5VUCBK4 \
  | 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: 477161d7bbadd48b06a615d7dad04157113b043152c06a5e5e3caaa62178ff0a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb9176ec6e5129838ea9f2b4ba20eece5acbc1c61a65c08faa6915eb91cf4538",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.PL",
    "submitted_at": "2019-08-15T17:28:01Z",
    "title_canon_sha256": "b692cb9bb02ae94a2ca5c95962c0d23319efdcac89edc6c81b561ed75dcb8e5b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.05647",
    "kind": "arxiv",
    "version": 3
  }
}