Pith Number

pith:OKXC7WJP

pith:2009:OKXC7WJPAQV5M5OVJXKSL7LUWA

not attested not anchored not stored refs pending

Simulating reachability using first-order logic with applications to verification of linked data structures

Greta Yorsh, Mooly Sagiv, Neil Immerman, Siddharth Srivastava, Tal Lev-Ami, Thomas Reps

arxiv:0904.4902 v2 · 2009-04-30 · cs.LO · 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{OKXC7WJPAQV5M5OVJXKSL7LUWA}

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	2026-05-18T01:37:40.419853Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

72ae2fd92f042bd675d54dd525fd74b00c1c2a08511c18c09a729d656098b94e

Aliases

arxiv: 0904.4902 · arxiv_version: 0904.4902v2 · doi: 10.48550/arxiv.0904.4902 · pith_short_12: OKXC7WJPAQV5 · pith_short_16: OKXC7WJPAQV5M5OV · pith_short_8: OKXC7WJP

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/OKXC7WJPAQV5M5OVJXKSL7LUWA \
  | 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: 72ae2fd92f042bd675d54dd525fd74b00c1c2a08511c18c09a729d656098b94e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "383c05c04f92215217108fbb7a0a11e0193debec7cc8f09669089570041311b8",
    "cross_cats_sorted": [
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2009-04-30T17:54:54Z",
    "title_canon_sha256": "048c12adcd1dbea1856c8275a939a1cd8dd25c41e2f2de8f776d05bde4b0fa50"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.4902",
    "kind": "arxiv",
    "version": 2
  }
}