Pith Number

pith:4WPA6ENU

pith:2020:4WPA6ENUQQTX3R7ZDB2INPZHLX

not attested not anchored not stored refs pending

Can Advanced Type Systems Be Usable? An Empirical Study of Ownership, Assets, and Typestate in Obsidian

Brad A. Myers, Jonathan Aldrich, Joshua Sunshine, Michael Coblenz

arxiv:2003.12209 v2 · 2020-03-27 · cs.SE · 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{4WPA6ENUQQTX3R7ZDB2INPZHLX}

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	2026-07-05T01:43:24.969404Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e59e0f11b484277dc7f9187486bf275df29f2237490affcb879e0e023a234b97

Aliases

arxiv: 2003.12209 · arxiv_version: 2003.12209v2 · doi: 10.48550/arxiv.2003.12209 · pith_short_12: 4WPA6ENUQQTX · pith_short_16: 4WPA6ENUQQTX3R7Z · pith_short_8: 4WPA6ENU

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/4WPA6ENUQQTX3R7ZDB2INPZHLX \
  | 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: e59e0f11b484277dc7f9187486bf275df29f2237490affcb879e0e023a234b97

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "06deb441a62a91f0bd54258b1bbeef5e56ce494d7cbf532b0000eb836f5f2299",
    "cross_cats_sorted": [
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.SE",
    "submitted_at": "2020-03-27T02:38:30Z",
    "title_canon_sha256": "d605b701d6fa54e201a9dd8fe48830a647e66abd8e05b103832c251821a87b36"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2003.12209",
    "kind": "arxiv",
    "version": 2
  }
}