Pith Number

pith:W3WU6HHX

pith:2016:W3WU6HHXOA7R4K4FXX53AURXWP

not attested not anchored not stored refs pending

First long-term optical spectro-photometric monitoring of a binary black hole candidate E1821+643: I. Variability of spectral lines and continuum

A. I. Shapovalova, A. Kovacevic, A. N. Burenkov, D. Ilic, J. Leon-Tavares, J. R. Valdes, J. Torrealba, L. C. Popovic, V. E. Zhdanova, V. H. Chavushyan, V. Patino-Alvarez, W. Kollatschny

arxiv:1601.03551 v1 · 2016-01-14 · astro-ph.GA · 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{W3WU6HHXOA7R4K4FXX53AURXWP}

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	2026-05-18T01:18:38.404233Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b6ed4f1cf7703f1e2b85bdfbb05237b3fa1dbeb0a7faa3d8b4dc8f4916a1c17e

Aliases

arxiv: 1601.03551 · arxiv_version: 1601.03551v1 · doi: 10.48550/arxiv.1601.03551 · pith_short_12: W3WU6HHXOA7R · pith_short_16: W3WU6HHXOA7R4K4F · pith_short_8: W3WU6HHX

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/W3WU6HHXOA7R4K4FXX53AURXWP \
  | 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: b6ed4f1cf7703f1e2b85bdfbb05237b3fa1dbeb0a7faa3d8b4dc8f4916a1c17e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "596b8f404f26ae3352bedaa9e8ab27c80a3d772a9776643c803201ad7b90a169",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2016-01-14T10:42:32Z",
    "title_canon_sha256": "cfe24305e01de6f7147d61a7c804e4322057f61a545ec93753bd55d4360c4c88"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1601.03551",
    "kind": "arxiv",
    "version": 1
  }
}