Pith Number

pith:W3V6TSY4

pith:2026:W3V6TSY45ILZTZKFY5Q2NJTRR3

not attested not anchored not stored refs pending

Photometric classification of quasars from DES and photo-$z$ estimation with Machine Learning

Camila Cardoso, Elcio Abdalla, Filipe B. Abdalla, Gabriel S. Costa, Pablo Motta

arxiv:2605.18218 v1 · 2026-05-18 · astro-ph.IM · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W3V6TSY45ILZTZKFY5Q2NJTRR3}

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	2026-05-20T00:05:50.993484Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b6ebe9cb1cea1799e545c761a6a6718ef5cb519fc89d23b08aeb36ba714ac2b4

Aliases

arxiv: 2605.18218 · arxiv_version: 2605.18218v1 · doi: 10.48550/arxiv.2605.18218 · pith_short_12: W3V6TSY45ILZ · pith_short_16: W3V6TSY45ILZTZKF · pith_short_8: W3V6TSY4

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/W3V6TSY45ILZTZKFY5Q2NJTRR3 \
  | 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: b6ebe9cb1cea1799e545c761a6a6718ef5cb519fc89d23b08aeb36ba714ac2b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dd6a25a97e76fb28dd145094deb03b5f96172ebc22dfeb8b8efe2524661aa1d1",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2026-05-18T11:04:05Z",
    "title_canon_sha256": "7ef7bcaa1fe3856d28f67fb68fa606732b451119acf1c4acab5d2e239cdfd339"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.18218",
    "kind": "arxiv",
    "version": 1
  }
}