Pith Number

pith:D4SYOEPY

pith:2010:D4SYOEPYSXIFW6LPB33FKQEXWM

not attested not anchored not stored refs pending

The Field X-ray AGN Fraction to z=0.7 from the Chandra Multiwavelength Project and the Sloan Digital Sky Survey

Anca Constantin, Daryl Haggard, Dong-Woo Kim, Paul J. Green, Scott F. Anderson, Tom L. Aldcroft, Wayne A. Barkhouse

arxiv:1004.1638 v2 · 2010-04-09 · astro-ph.HE · 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{D4SYOEPYSXIFW6LPB33FKQEXWM}

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	2026-05-18T02:08:07.284006Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1f258711f895d05b796f0ef6554097b31c6267c0c2ddcbcf6ed66bb79ace9134

Aliases

arxiv: 1004.1638 · arxiv_version: 1004.1638v2 · doi: 10.48550/arxiv.1004.1638 · pith_short_12: D4SYOEPYSXIF · pith_short_16: D4SYOEPYSXIFW6LP · pith_short_8: D4SYOEPY

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/D4SYOEPYSXIFW6LPB33FKQEXWM \
  | 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: 1f258711f895d05b796f0ef6554097b31c6267c0c2ddcbcf6ed66bb79ace9134

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9a3548a2abcb960de95dada2b9e036c10e88e8cfd4ea761e46560122ff44af93",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2010-04-09T20:01:21Z",
    "title_canon_sha256": "1ea93bc3a9009812c47091cb1d123a93275e6cd9e3e0c0204c8fd43c5ba7e46d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.1638",
    "kind": "arxiv",
    "version": 2
  }
}