Pith Number

pith:W4A4TYHF

pith:2014:W4A4TYHF3XJMB6DQ5SHI2CN7MT

not attested not anchored not stored refs pending

Fractional Repetition and Erasure Batch Codes

Natalia Silberstein

arxiv:1405.6157 v2 · 2014-05-04 · 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{W4A4TYHF3XJMB6DQ5SHI2CN7MT}

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	2026-05-18T02:39:48.179015Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b701c9e0e5ddd2c0f870ec8e8d09bf64e84c6c0c3b31449cf3fb4524e0684886

Aliases

arxiv: 1405.6157 · arxiv_version: 1405.6157v2 · doi: 10.48550/arxiv.1405.6157 · pith_short_12: W4A4TYHF3XJM · pith_short_16: W4A4TYHF3XJMB6DQ · pith_short_8: W4A4TYHF

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/W4A4TYHF3XJMB6DQ5SHI2CN7MT \
  | 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: b701c9e0e5ddd2c0f870ec8e8d09bf64e84c6c0c3b31449cf3fb4524e0684886

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "94f137e088e1536e4b83478edf66087ecc27fd70a35e85d0f4a054176f955d21",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2014-05-04T13:04:14Z",
    "title_canon_sha256": "9cee96fc4127b7bd7cc8a6378d3ebb040013000c7c45f0b83a6ff1438c18b7e8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1405.6157",
    "kind": "arxiv",
    "version": 2
  }
}