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
arxiv:1601.03551 v1 · 2016-01-14 · astro-ph.GA · astro-ph.CO
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
· sign in to
claim
4
Citations
5
Replications
✓
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
· · · · ·Agent API
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
}
}