Pith Number

pith:PK75JNUA

pith:2021:PK75JNUAGOYC7BLS6X4F4HL32H

not attested not anchored not stored refs pending

Performance Portable Back-projection Algorithms on CPUs: Agnostic Data Locality and Vectorization Optimizations

Hirotaka Ogawa, Mohamed Wahib, Peng Chen, Satoshi Matsuoka, Shinichiro Takizawa, Takahiro Hirofuchi, Xiao Wang

arxiv:2104.13248 v1 · 2021-04-27 · cs.DC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PK75JNUAGOYC7BLS6X4F4HL32H}

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	2026-07-05T02:35:46.905340Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7abfd4b68033b02f8572f5f85e1d7bd1f568e53b02b1fd94b162d2a942e38d06

Aliases

arxiv: 2104.13248 · arxiv_version: 2104.13248v1 · doi: 10.48550/arxiv.2104.13248 · pith_short_12: PK75JNUAGOYC · pith_short_16: PK75JNUAGOYC7BLS · pith_short_8: PK75JNUA

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/PK75JNUAGOYC7BLS6X4F4HL32H \
  | 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: 7abfd4b68033b02f8572f5f85e1d7bd1f568e53b02b1fd94b162d2a942e38d06

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "401748e6ee6061420212560691a0bd8874d03daf2575ccc069fb16b36d4e7ff9",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.DC",
    "submitted_at": "2021-04-27T15:01:12Z",
    "title_canon_sha256": "b2bf6f1052bdceb5d0137cbda9354fef58106e230f751b0a6c72320a660b2dba"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2104.13248",
    "kind": "arxiv",
    "version": 1
  }
}